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    Abnormal Bi3+ activated NIR phosphor toward multifunctional LED applications / Y. Li, S. Gai, H. Zhu [et al.] // Ceram. Int. - 2023. - Vol. 49, Is. 23, Pt. B. - P. 39671-39680, DOI 10.1016/j.ceramint.2023.09.322. - Cited References: 45. - This research was jointly supported by the National Natural Science Foundation of China (Grant No. 51974123 ), the Key R & D Projects in Hunan Province ( 2021SK2047 , 2022NK2044 ), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261 ), Wangcheng Science and Technology Plan ( KJ221017 ), the Science and Technology Innovation Program of Hunan Province ( 2022WZ1022 ) and the Strategic Academic Leadership Program “Priority-2030” for the Siberian Federal University . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Аномальный Bi3+-активированный БИК-люминофор для применения в многофункциональных светодиодах
Кл.слова (ненормированные):
Phosphor -- Luminescence -- Bi3+ -- NIR emission
Аннотация: Herein, the strategy of replacing Ge4+ with smaller Si4+ was adopted to realize the site-selective occupation of Bi3+ activator in the small ring and obtain a near-infrared light-emitting in Zn2(Ge,Si)O4. The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift (εc) and crystal field splitting (εcfs). This work not only provides new insights for the development of Bi3+-activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi3+.

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Держатели документа:
College of Bioscience and Biotechnology, Hunan Agricultural University, Hunan, Changsha, 410128, China
Hunan Provincial Engineering Technology Research Center for Optical Agriculture, Hunan Agricultural University, Changsha, 410128, China
School of Materials Science and Engineering, Hunan Agricultural University, Hunan, Changsha, 410128, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Li, Y.; Gai, S.; Zhu, H.; Yin, J.; Guo, W.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lu, X.; Xia, M.; Zhou, Z.
}
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Anharmonicity and local noncentrosymmetric regions in BaTiO3 pressed powder studied by the Raman line temperature dependence / A. M. Pugachev, I. V. Zaytseva, N. V. Surovtsev, A. S. Krylov // Ceram. Int. - 2020. - Vol. 46, Is. 14. - P. 22619-22623, DOI 10.1016/j.ceramint.2020.06.024. - Cited References: 26. - The reported study was funded by RFBR , according to the research project No. 18-02-00399 and 19-42-543-016 , Government of Novosibirsk region No. 19-42-543-016 and State assignment No AAAA-A17-117052410033-9. The experiments were performed in the multiple-access center “High-Resolution Spectroscopy of Gases and Condensed Matter” in IA&E SB RAS (Novosibirsk, Russia) and Center for Common Use of the Krasnoyarsk Scientific Center, SB RAS (Krasnoyarsk, Russia) . - ISSN 0272-8842
Кл.слова (ненормированные):
BaTiO3 -- Non-hydrostatic pressure -- Raman scattering -- Anharmonicity -- Noncentrosymmetric regions
Аннотация: The temperature dependencies of position, width, and integral amplitude the E(TO) line near 307 cm−1 in Raman spectra in barium titanate powders with different non-hydrostatic pressure and temperature treatment were studied. It was found that parameters of the E(TO) line near 307 cm−1 are different in the crystal, the untreated powder, the powder treated by the non-hydrostatic pressure, and the powder annealed after the pressure treatment. The line width (FWHM) increase with temperature according to Klemens model. It indicates that the origin of the line broadening is the anharmonicity of the E(TO) phonons. The pressure treatment changes the anharmonicity of the phonon potential. It was found that the temperature dependence of the integral intensity of the E(TO) line is similar to that of the second optical harmonic signal and reflects the presence of the local polar regions. Thus, the E(TO) line in the Raman spectrum allows one to characterize the average polarity of local regions and their anharmonicity depending on non-hydrostatic pressures and thermal treatment.

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Держатели документа:
Institute of Automation and Electrometry SB RAS, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Pugachev, A. M.; Zaytseva, I. V.; Surovtsev, N. V.; Krylov, A. S.; Крылов, Александр Сергеевич
}
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Behaviour of thermal expansion of (1-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3 solid solutions / K. Bormanis [et al.] // Proc. Est. Acad. Sci. - 2017. - Vol. 66, Is. 4. - P. 363-371, DOI 10.3176/proc.2017.4.09. - Cited References: 25. - The publication costs of this article were covered by the Estonian Academy of Sciences and the University of Tartu. . - ISSN 1736-6046
Кл.слова (ненормированные):
Ferroelectrics -- Relaxors -- Ceramics -- Solid solutions -- Thermal expansion -- Phase diagram
Аннотация: The features of the dependence of the bulk coefficient of thermal expansion of the (1-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3 solid solution studied in the series of x = 0-0.8 in the temperature range from 100 to 750 K are reported. The obtained data and observed anomalies of thermal expansion are compared with dielectric properties, heat capacity, and the phase diagram of concentration. The anomalous and lattice constituents of deformation and of the coefficient of thermal expansion are analysed and the data on deformation are used to estimate the Burns temperature and the mean square polarization of the samples found to decrease with the decrease of the PbTiO3 concentration.

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Держатели документа:
Institute of Solid State Physics, University of LatviaRiga, Latvia
L.V. Kirensky Institute of Physics, Siberian SC RAS, Krasnoyarsk, Russian Federation
Institute of Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Bormanis, K.; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Sternberg, A.; Lace, L.; Ignatans, R.; Kalvane, A.; Antonova, M.
}
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Bi2(Sn0.95Cr0.05)2O7: Structure, IR spectra, and dielectric properties / S. S. Aplesnin [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 4. - P. 5177-5183, DOI 10.1016/j.ceramint.2015.12.040. - Cited References: 45. - This work was supported by the Russian Foundation for Basic Research Projects no. 15-42-04099 r_siberia_a, Siberian Branch of Science and NAS of Belarus “Electronic and magnetic phase transitions in materials with magnetoelectric affect” and government work no. 114090470016. . - ISSN 0272-8842

РУБ Materials Science, Ceramics
Рубрики:
BISMUTH PYROSTANNATE
   PYROCHLORE STRUCTURE
   MAGNETIC-PROPERTIES
   PARTIAL OXIDATION
   HIGH-TEMPERATURE
   X-RAY
   Bi2Sn2O7
   SUBSTITUTION
   CATALYSTS
   DIFFRACTION
Кл.слова (ненормированные):
Bismuth pyrostannate -- Infrared absorption spectra -- Structural transition -- Permittivity -- Debye model
Аннотация: Infrared absorption spectra of the bismuth pyrostannate Bi2(Sn0.95Cr0.05)2O7 were investigated in the frequency range 350-1100 cm-1 at temperatures of 110-525 K. Four frequency regions with split absorption lines are distinguished. Softening of frequencies at the structural transitions was observed. The maxima of permittivity measured in the frequency range 1-200 kHz at temperatures 100-400 K were determined. It was found that the magnetic susceptibility changes its sign in the low-temperature region. The correlation between anomalies in the magnetic susceptibility, permittivity, and absorption line intensity was established. Softening of frequencies is explained by the variation in the coefficient of thermal expansion of the lattice. The temperature behavior of permittivity is described using the Debye model. © 2015 Elsevier Ltd and Techna Group S.r.l.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Akademgorodok 50, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Shestakov, N. P.; Шестаков, Николай Петрович
}
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BT-30 Ceramic Electrophysical Properties / N. A. Drokin, V. S. Kiiko, A. V. Pavlov, A. I. Malkin // Refract. Ind. Ceram. - 2020. - Vol. 61, Is. 3. - P. 341-348, DOI 10.1007/s11148-020-00484-2. - Cited References: 12 . - ISSN 1083-4877. - ISSN 1573-9139
Кл.слова (ненормированные):
(BeO + TiO2)-ceramic -- electrophysical properties -- electrical resistance activation energy
Аннотация: A total complex resistance (impedance) method is used to study the electrophysical characteristics of (BeO + TiO2)-ceramics modified with TiO2 micro- and nanoparticles in an amount of 30 wt.% (BT-30). Dispersion of the actual ε′ and imaginary ε′′ components of the dielectric permittivity component and specific conductivity in the frequency range from 100 Hz to 100 MHz from room temperature to the boiling point of liquid nitrogen are determined. High values of ε′ and ε′′ in the low-frequency range are typical for structurally inhomogeneous materials due to the accumulation of electric charges at the surface and within microcrystals. Two dielectric relaxation processes associated with electrical conductivity within the body and at the surface of ceramics are detected for the first time. An increase in conductivity with an increase in the microwave field frequency above 1 MHz is explained by the appearance of a current relaxation component. The activation energy of the static resistance of ceramic specimens is determined as a function of the reciprocal temperature that depends little on the weight content of TiO2 nanoparticles and varies in the range of 0.024 – 0.10 eV This also confirms the existence of two independent conduction processes, weakly dependent on the nanoparticle content in the ceramic composition. With placement of ceramic in a high-frequency electric field, spatial charges are formed, the field of which contributes to creation of additional polarization and dielectric losses.

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Держатели документа:
FGBOU VO Academician M. F. Reshetnev Siberian Aerospace University, Krasnoyarsk, Russia.
FGBUN Federal Research Center, Krasnoyarsk Scientific Center of the Siberian Section, Russian Academy of Sciences, Krasnoyarsk, Russia.
FGAOU VO Ural Federal University, Ekaterinburg, Russia.
FGAOU VO Siberian Federal University, Krasnoyarsk, Russia.

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Kiiko, V. S.; Pavlov, A. V.; Malkin, A. I.
}
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Caloric and multicaloric effects in oxygen ferroics and multiferroics / I. N. Flerov [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 3. - P. 429-441, DOI 10.1134/S1063783415030075. - Cited References:53. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-924.2014.2). . - ISSN 1063. - ISSN 1090-6460. -

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   MAGNETOCALORIC MATERIALS
   ELECTROCALORIC MATERIALS
   REFRIGERATION
   CERAMICS
   OXYFLUORIDES
Аннотация: The main problems of the current state-of-the-art research into the caloric effects observed in oxygen ferroics, multiferroics, and composites, as well as the influence of different factors (anisotropy, dimensional parameters, direct and indirect interferroic interactions) on these effects, have been considered. Possible ways to increase the caloric efficiency of materials have been analyzed.

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Публикация на русском языке Калорические и мультикалорические эффекты в кислородных ферроиках и мультиферроиках [Текст] / И. Н. Флёров [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 3. - С. 421-431

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Всероссийская конференция по физике сегнетоэлектриков(20 ; 2014 ; 18-22 авг. ; Красноярск)
}
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Characterization and magnetic properties of sintered glass-ceramics from dispersed fly ash microspheres / E. V. Fomenko, G. V. Akimochkina, Yu. V. Knyazev [et al.] // Magnetochemistry. - 2023. - Vol. 9, Is. 7. - Ст. 177, DOI 10.3390/magnetochemistry9070177. - Cited References: 50. - Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, grant number 22-27-20039, https://rscf.ru/project/22-27-20039/ (accessed on 15 March 2023) . - ISSN 2312-7481
Кл.слова (ненормированные):
sintering -- dispersed microspheres -- fly ash -- glass-ceramics -- soft magnetic materials -- characterization -- Mossbauer spectroscopy -- magnetic measurements
Аннотация: The recycling of hazardous industrial waste into high-tech materials with desired properties is of considerable interest since it provides optimal alternatives for its final disposal. Coal fly ash, the major waste generated by coal-fired power plants, contains significant quantities of dispersed microspheres with a diameter smaller than 10 μm, which are anthropogenic atmospheric pollutants PM10. Due to their composition and fine-grained powder morphology, they can be converted into sintered products. In this study, dispersed microspheres from class C fly ash were directly sintered without any additive to form high-strength glass-ceramics with magnetic properties. The optimum processing conditions were achieved at a temperature of 1200 °C, at which samples with a compressive strength of 100.6 MPa were obtained. Sintering reduces the quantity of the glass phase and promotes the formation of larnite, Fe-spinel, ye’elimite, and ternesite. Mössbauer measurements show that the relative concentration of the magnetic phase compared to the paramagnetic one rises almost in order. The sintered sample demonstrates a narrower distribution of the hyperfine magnetic field and a significantly lower value of the coercive field of 25 Oe, which allows proposing such materials as soft magnetic materials. The presented results demonstrate promising industrial applications of hazardous PM10 to minimize solid waste pollution.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 79 Svobodny Av., 660041 Krasnoyarsk, Russia
Laboratory of Electron Microscopy, Siberian Federal University, 79 Svobodny Av., 660041 Krasnoyarsk, Russia
Department of Chemistry, Siberian Federal University, Svobodny Av. 79, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Fomenko, E. V.; Akimochkina, G. V.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Semenov, S. V.; Семёнов, Сергей Васильевич; Yumashev, V. V.; Solovyov, L. A.; Anshits, A. G.
}
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    Complex oxide with negative thermal expansion for producing ceramic matrix composites with invar effect / E. S. Dedova [et al.] // AIP Conf. Proc. - 2016. - Vol. 1783: Advanced materials with hierarchical structure for new technologies and reliable structures 2016. - Ст. 020037, DOI 10.1063/1.4966330. - Cited References: 12. - The research was conducted with partial financial support by an agreement with the Ministry of Education No. 14.575.21.0040 (RFMEFI57514X0040). Authors are grateful to Institute of Physics for their help in the dilatometer investigation.
   Перевод заглавия: Комплексные оксиды с отрицательным тепловым расширением для получения керамических композитов с инварным эффектом
Кл.слова (ненормированные):
ceramics -- zirconium tungstate -- negative thermal expansion coefficient -- phase transformation -- spinel
Аннотация: The article investigates the phase composition of (Al2O3 – 20 wt % ZrO2)–ZrW2O8 ceramic composites obtained by cold-pressing and sintering processes. Using X-ray analysis it has been shown that composites mainly have monoclinic modification of zirconium dioxide and orthorhombic phase of aluminum oxide. After adding zirconium tungstate the phase composition of sintered ceramics changes, followed by the formation of tungsten-aluminates spinel such as Alx(WOy)z. It has been shown that thermal expansion coefficient of material decreases approximatly by 30%, as compared with initial ceramics.

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Доп.точки доступа:
Dedova, E. S.; Pertushina, M. U.; Kondratenko, A. I.; Gorev, M. V.; Горев, Михаил Васильевич; Kulkov, S. N.; International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016(Tomsk)(19-23 Sept. 2016)
}
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    Crystal structure and luminescence properties of green-emitting Sr1−xAl12O19:xEu2+ phosphors / B. Ma [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 5. - P. 5995-5999, DOI 10.1016/j.ceramint.2015.12.149. - Cited References: 30. - This work was supported by the National Natural Science Foundation of China (Grant nos. 51032007 and 51372232) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015024). . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства зеленого люминофора Sr1-xAl12O19:xEu2+

РУБ Materials Science, Ceramics
Рубрики:
COLOR-TUNABLE PHOSPHOR
   ENERGY-TRANSFER
   Dy3+ PHOSPHORS
   NEAR-UV
   Eu2+
   DIODES
   PHASE
   STATE
   Ce3+
Кл.слова (ненормированные):
Crystal structure -- Magnetoplumbite -- Phosphor
Аннотация: In this paper, a series of novel luminescent Sr1−xAl12O19:xEu2+ phosphors were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the decay curves were investigated. The quenching concentration of Eu2+ in SrAl12O19 was about 0.15 (mol). Upon excitation at 378 nm, the composition-optimized Sr0.85Al12O19:0.15Eu2+ exhibited strong broad-band green emission at 530 nm with the CIE chromaticity (0.2917, 0.5736). The results indicate that Sr1−xAl12O19:xEu2+ phosphors have potential applications as green-emitting phosphors for UV-pumped white-light LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Ma, Bin; Guo, Q. F.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lv, Zhenfei; Yao, Jun; Mei, Lefu; Huang, Zhaohui
}
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10.

    Crystal structure and luminescence properties of novel Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphor with apatite structure / Q. F. Guo [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 10. - P. 11687-11691, DOI 10.1016/j.ceramint.2016.04.086. - Cited References:26. - This present work is supported by the National Natural Science Foundation of China (Grant no. 41172053). . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства нового люминофора Sr10-x(SiO4)3(SO4)3O:xEu2+ со структурой апатита

РУБ Materials Science, Ceramics
Рубрики:
Light-Emitting-Diodes
   Energy-transfer
   Tunable phosphor
   LEDs
   Eu-2+
   Ions
   Ce3+
Кл.слова (ненормированные):
Crystal structure -- Apatite -- Phosphor
Аннотация: In this paper, a series of novel luminescent Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors with apatite structure were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the PL thermal stability were investigated. Sr9.92(SiO4)3(SO4)3O:0.08Eu2+ phosphor exhibits better thermal quenching resistance, retaining the luminance of 66.55% at 150 °C compared with that at 25 °C. The quenching concentration of Eu2+ in Sr10(SiO4)3(SO4)3O was about 0.08 (mol) with the dipole–quadrupole interaction. The Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors exhibited a broad-band green emission at 538 nm upon excitation at 396 nm. The results indicate that Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors have potential applications as near UV-convertible phosphors for white-light UV LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Guo, Q. F.; Ma, B.; Liao, L. B.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mei, L. F.; Liu, H. K.
}
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11.

DC-EFFECT ON THE MICROWAVE RESPONSE IN THE SUPERCONDUCTING CERAMICS HO-BA-CU-O / G. A. PETRAKOVSKII [et al.] // Solid State Commun. - 1989. - Vol. 72, Is. 8. - P. 759-762, DOI 10.1016/0038-1098(89)90903-4. - Cited References: 18 . - ISSN 0038-1098

РУБ Physics, Condensed Matter

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Доп.точки доступа:
PETRAKOVSKII, G. A.; Петраковский, Герман Антонович; PATRIN, G. S.; Патрин, Геннадий Семёнович; USTYUZHANIN, Y. N.; SABLINA, K. A.; Саблина, Клара Александровна; STEPANOV, G. N.
}
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12.

Patrin, G. S.
Detection of magneto-dependent higher harmonics in htsc ceramics via the change of the low field microwave response under the passing of an alternating-current / G. S. Patrin, G. A. PETRAKOVSKII, I. E. KHARITONOV // Phys. Lett. A. - 1991. - Vol. 158, Is. 3-4. - P. 167-170, DOI 10.1016/0375-9601(91)90921-T. - Cited References: 15 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
BA-CU-O
GENERATION
STATE
Аннотация: The results of an investigation on the generation of higher harmonics under the passing of a low frequency current in HTSC ceramics by microwave spectroscopy methods are presented. It is found that the generation of only even harmonics occurs. The dependence of the signal upon the harmonic number and. as an example for the second harmonic, the temperature dependences of the microwave response parameters are discussed.

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Доп.точки доступа:
PETRAKOVSKII, G. A.; Петраковский, Герман Антонович; KHARITONOV, I. E.; Патрин, Геннадий Семёнович
}
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13.

Dielectric and transport properties, electric polarization at the sequential structural phase transitions in iron-substituted bismuth pyrostannate / S. S. Aplesnin, L. V. Udod, M. N. Sitnikov, O. B. Romanova // Ceram. Int. - 2021. - Vol. 47, Is. 2. - P. 1704-1711, DOI 10.1016/j.ceramint.2020.08.287. - Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research project № 20-52-00005 Bel_a . - ISSN 0272-8842
Кл.слова (ненормированные):
Dielectric properties -- Impedance -- Electrical conductivity -- Electric polarization -- Thermopower
Аннотация: The electrical characteristics including the electrical resistance, impedance, I–V characteristics, capacitance, dissipation factor, and thermoelectric power of the Bi2Sn2-хFeхO7 (х = 0.1, 0.2) stannates have been investigated in the temperature range of 100–600 K at frequencies of 102–106 Hz. The paramagnetic contribution of electrons to the dynamic magnetic susceptibility has been established. The conductivity mechanism of the compounds has been found from the I–V characteristics and the change in the carrier sign has been determined from the thermoelectric power. The hysteresis of the I–V curves, charge transfer currents and polarization current have been observed in the Bi2Sn1·8Fe0·2O7 compound. A nonlinear field dependence of the polarization in the orthorhombic phase has been found. The correlation between the obtained characteristics and the phase structure transitions has been established. Two relaxation channels and activation energy have been found using the Debye model. The hysteretic I–V characteristics have been explained using a model of the electronic structure and the dipole and migration polarization.

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Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Romanova, O. B.; Романова, Оксана Борисовна
}
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14.

Dielectric relaxation and phase transition behavior of (1–x)Pb(Zn1/3Nb2/3)O3-xBaTiO3 binary solid solutions / Q. Gao [et al.] // Ceram. Int. - 2018. - Vol. 44, Is. 15. - P. 18491-18498, DOI 10.1016/j.ceramint.2018.07.069. - Cited References: 53. - This work was supported by the National Basic Research Program of China (Grant No. 2015CB654602 ), the International Science & Technology Cooperation Program of China (Grant No. 2015DFA51100 ), the NSFC projects (Grant Nos. 51761145024 and 51772239 ), Shaanxi province project 2017 ktpt-21, the Joint fund of the Ministry of Education (Grant No. 6141A02033210 ) and the 111 Project under Grant No. B14040 . The SEM work was done at International Center for Dielectric Research (ICDR), Xi’an Jiaotong University, Xi’an, China. . - ISSN 0272-8842
Кл.слова (ненормированные):
Dielectric relaxation -- Phase transition -- “U”-shaped variation -- Polarization mismatch
Аннотация: Dielectric relaxation and phase transition behaviors in (1–x)Pb(Zn1/3Nb2/3)O3-xBaTiO3 (PZN-BT) binary solid solutions have been systematically studied in this paper. All the compositions display a pure pseudo-cubic perovskite structure. As the BT contents increase from 10 mol% to 70 mol%, the phase transition peak becomes broader and broader, accompanying with decreases of ɛm (the maximum dielectric permittivity) and Tm (the temperature corresponds to the ɛm). Nevertheless, an abnormal increase of ɛm and Tm occurs when the BT contents exceeds 70 mol%, forming a “U” shaped curve of the compositional dependence of ɛm and Tm. Moreover, it is indicated from the new glass model fitting results that the characteristic parameter p, which represents the degree of relaxation, also shows a similar “U” shaped variation curve. Similarly, as shown in polarization-electric field loops, both remnant polarizations (Pr) and coercive fields (Ec) display the “U” shaped curve as the BT content changes from 10 mol% to 80 mol%. Finally, according to the similar variation of these key parameters mentioned above, a polarization mismatched model, which describes the destruction and reestablishment of the long range order arrangement in solid solutions composed of two kinds of ferroelectrics, is proposed to illustrate the underlying mechanism. In this PZN-BT system or other similar ABO3-type perovskite relaxors, the competition between the A-O and B-O coupling plays an important role to form the “U” shaped evolution of these key parameters.

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Держатели документа:
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and In formation Engineering, Xi'an Jiaotong University, Xi'an, China
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russian Federation

Доп.точки доступа:
Gao, Q.; Hu, Q.; Jin, L.; Gorev, M. V.; Горев, Михаил Васильевич; Chezganov, D. S.; Vlasov, E. O.; Zeng, H.; Zhao, L.; Cui, Y.; Xu, Z.; Wei, X.
}
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15.

Dumping soft modes in Raman spectra of antiferroelectric (Pb-La)(Zr-Sn-Ti)O3 ceramics / A. N. Vtyurin [et al.] // Joint Conference of the IEEE ISAF, EMF, ICE, IWPM and PFM : Abstract book. - 2019. - P. 694. - Cited References: 3

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Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS, 660036, Krasnoyarsk, Russia
Siberian Federal University
Xi’an Jiaotong University

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Wei, Xiaoyong; Feng, Yujun; Xu, Ran; Zhao, Tian; IEEE International Symposium on Applications of Ferroelectrics(2019 ; July ; 14-19 ; Lausanne, Switzerland); International Conference on ElectroCeramics(2019 ; July ; 14-19 ; Lausanne, Switzerland); European Meeting on Ferroelectricity(14 ; 2019 ; 14-19 July ; Lausanne, Switzerland); International Workshop on PiezoMEMS(2019 ; July ; 14-19 ; Lausanne, Switzerland); Piezoresponse Force Microscopy Workshop(2019 ; July ; 14-19 ; Lausanne, Switzerland)
}
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16.

Effect of A-site cation ordering on the thermoelectric properties of the complex cobalt oxides Gd1-xSrxCoO3-δ (x = 0.8 and 0.9) / V. A. Dudnikov [et al.] // Ceram. Int. - 2018. - Vol. 44, Is. 9. - P. 10299-10305, DOI 10.1016/j.ceramint.2018.03.037. - Cited References: 38. - This work was supported by the Russian Science Foundation , project no. 16-13-00060. . - ISSN 0272-8842
Кл.слова (ненормированные):
Substituted rare earth cobalt oxides -- Thermoelectric oxide materials -- Ordered and disordered states
Аннотация: The effect of substitution of Sr2+ ions for Gd3+ ions on the phase composition, electrical resistivity, thermoelectricity, and thermal conductivity of rare-earth cobalt oxides Gd1-xSrxCoO3-δ (x = 0.8 and 0.9) has been investigated. It has been determined that at the investigated strontium concentrations, the single-phase disordered nonstoichiometric cubic perovskites and superstructures with ordered Sr2+/Gd3+ ions and anion vacancies can be formed. The influence of ordering/disordering of Gd and Sr cations over crystal-lattice A- sites on the thermoelectric figure of merit and sample stability at high temperatures has been studied. The thermoelectric figure of merit of the disordered samples was found to exceed by far the analogous parameter of the ordered samples, which allows us to consider the disordering as a way of improving the thermoelectric parameters. Two contributions to the conductivities are discussed: high-temperature thermoactivation and low-temperatures variable range hopping. The parameters of the Mott electronic structure, including DOS N(εF), hopping energy ε (the energy of hopping conductivity activation), and hopping length Rh, have been estimated.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Fedorov, A. S.; Федоров, Александр Семенович; Solov'yov, L. A.; Vereshchagin, S. N.; Burkov, A. T.; Novikov, S. V.; Gavrilkin, S. Yu.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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17.

Zamkova, N. G.
Effect of cation substitution on the lattice dynamics and ferroelectric instability of cubic BaTiO3 and BaZrO3 doped with Bi and La ions / N. G. Zamkova, V. I. Zinenko // Phys. Solid State. - 2009. - Vol. 51, Is. 5. - P. 973-981, DOI 10.1134/S1063783409050151. - Cited References: 11. - This work was supported by the Russian Foundation for Basic Research, project no. 07-02-00069. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CERAMICS
Аннотация: The spectra of lattice vibration frequencies of solid solutions Ba1 - x Bi(2x/3)a-- Ti-x/3(Zr)O-3 and Ba1 - x La (x) Ti(Zr)(1 - x/4)a-- O-x/4(3) are calculated in terms of a generalized Gordon-Kim model with inclusion of the dipole and quadrupole polarizabilities. Over the entire concentration range, the calculated phonon spectra contain a ferroelectric soft mode. The effect of various interactions on the ferroelectric instability of these solid solutions is studied. It is shown that the character of ferroelectric instability is largely determined by the mechanism of charge compensation.

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Держатели документа:
[Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Замкова, Наталья Геннадьевна; Russian Foundation for Basic Research [07-02-00069]
}
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18.

    Effect of ligand environment of rare-earth ions on temperature measurement performance of SrAO4:xEu3+ (A = Mo and W) phosphors / H. Gao, M. S. Molokeev, Q. Chen [et al.] // Ceram. Int. - 2022. - Vol. 48, Is. 24. - P. 36835-36844, DOI 10.1016/j.ceramint.2022.08.247. - Cited References: 58. - This work was supported by the National Natural Science Foundation of China (Grant No. 51802172) and the Natural Science Foundation of Qinghai Province (Grant No. 2021-ZJ-713) . - ISSN 0272-8842
   Перевод заглавия: Влияние лигандного окружения редкоземельных ионов на температурные характеристики люминофоров SrAO4:xEu3+ (A = Mo и W)
Кл.слова (ненормированные):
Luminescent thermometer -- Ligand environment -- Temperature measurement performance
Аннотация: Molybdate and tungstate with scheelite-type structure are excellent self-luminescent materials, which can be used as ideal hosts for the doping of rare-earth ions. In this study, a series of Eu3+-activated SrAO4 (A = Mo and W) phosphors were successfully synthesized, and their crystal structures, photoluminescence properties, and temperature measurement performance were analyzed in detail. These phosphors were excited by UV light (291 nm and 247 nm, respectively), with clear energy transfer (ET) (MoO42−→Eu3+ or WO42−→Eu3+). According to fluorescence intensity ratio (FIR) and Judd–Ofelt (J–O) theory, compared to SrWO4:0.01Eu3+ phosphor, SrMoO4:0.01Eu3+ phosphor exhibited better thermal stability, with relatively low Sa value (maximum values were 5.082 %K−1 and 20.74 %K−1, respectively), and their Sr values were not significantly different (maximum values were 0.864 %K−1 and 0.83 %K−1, respectively). Sa value was negatively correlated to central asymmetry of Eu3+, but the optimal Sr value tended to be more suitable for central asymmetry of Eu3+. In addition, Eu3+ exhibited stronger central asymmetry as well as covalency of Eu–O bond in SrMoO4. Results reveal that SrMoO4:xEu3+ and SrWO4:xEu3+ can be used for luminescent thermometers.

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Держатели документа:
School of Mechanical Engineering, Qinghai University, Xining, 810016, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Gao, H.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, Q.; Yang, X.; Wang, X.; Ma, B.
}
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19.

Effect of mechanical activation on the thermoelectric properties of Sr1-xSmxTiO3 ceramics / Y. S. Orlov, S. N. Vereshchagin, S. V. Novikov [et al.] // Ceram. Int. - 2021. - Vol. 47, Is. 20. - P. 28992-28999, DOI 10.1016/j.ceramint.2021.07.060. - Cited References: 31. - This study was supported by the Russian Science Foundation, project no. 19-72-00097 . - ISSN 0272-8842. - ISSN 1873-3956

РУБ Materials Science, Ceramics
Рубрики:
SRTIO3
   LA
   MICROSTRUCTURE
   CONDUCTIVITY
   PERFORMANCE
   FIGURE
   MERIT
Кл.слова (ненормированные):
Strontium titanate solid solutions -- Thermoelectric oxide materials -- Mechanochemical activation
Аннотация: The Sr1-xSmxTiO3 (х = 0.025, 0.05, 0.075, 0.1, 0.2) strontium titanate solid solutions were prepared from oxides and carbonates using a conventional ceramic technology based on the mechanochemical activation. The electrical conductivity and Seebeck coefficient of the synthesized compounds were measured in the temperature range from 300 to 800 K. We found that the properties of the samples significantly depend on the preliminary mechanochemical activation. The thermoelectric power factor attains maximum value in the hydrogen reduced samples with concentration of х = 0.05 and 0.075 obtained from nanoparticles: 5.5 μW/(cm · K2) for Sr0.95Sm0.05TiO3 (580 K) and 4.10 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K). An increase in the annealing temperature of mechanically activated samples leads to an even greater increase in electrical conductivity and power factor: 9.2 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K).

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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk 660036, Russia.
Ioffe Inst, St Petersburg 194021, Russia.

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Vereshchagin, S. N.; Novikov, S., V; Burkov, A. T.; Borus, A. A.; Борус, Андрей Андреевич; Sitnikov, M., V; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00097]
}
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20.

Efficiency of energy harvesting and storage using a multilayer capacitor based on BaTi0.86Sn0.14O3 ferroelectric lead-free ceramics / V. D. Fokina, V. S. Bondarev, E. I. Pogoreltsev, I. N. Flerov // Ceram. Int. - 2022. - Vol. 48, Is. 22. - P. 32966-32972, DOI 10.1016/j.ceramint.2022.07.227. - Cited References: 45 . - ISSN 0272-8842
Кл.слова (ненормированные):
Ferroelectric properties -- BaTiO3 and titanates -- Capacitors -- Energy harvesting/storage
Аннотация: The study of the parameters of energy harvesting and storage in the lead-free solid solution BaTi0.86Sn0.14O3 (BTSnO) was performed. The permittivity shows the behavior similar to a diffuse phase transition with the critical exponent γ = 1.84, which is close to the value characteristic of relaxors. Large values of the recoverable energy density, Wrec=(5.8–7.0)∙104 J/m3, and the energy storage efficiency coefficient, η=(82–94) %, are implemented in a wide temperature range, 30–87°С, at a low electric field, E = 18.5 kV/cm. For the first time, the analysis of the Olsen cycle was performed using two phase diagrams: polarization – electric field and entropy – temperature. A fairly good agreement was found between the values of the energy conversion density, ND ≈ 0.15 J/cm3, which was determined using two approaches. A universal parameter is proposed for comparing the energy harvesting density for the materials studied in different ranges of temperature and electric fields.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич
}
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