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1.
Vtyurin, A. N.
Lattice dynamics and phase transitions in eplasolite-like
fluorides
– Raman scattering study / A. N. Vtyurin> //
Ninth international seminar on ferroelastic physics (ISFP-9) : book of abstracts / org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2018. - P.
Материалы конференции
,
Материалы конференции
Доп.точки доступа:
Zinenko, V. I. \progr. com.\; Зиненко, Виктор Иванович; Flerov, I. N. \org. com.\; Флёров, Игорь Николаевич; Втюрин, Александр Николаевич; International Seminar on Ferroelastic Physics(9 ; 2018 ; Sept. ; 12-15 ; Voronezh); Международный семинар по физике сегнетоэластиков(9(14) ; 2018 ; сент. ; 12-15 ; Воронеж); Российская академия наук; Воронежский государственный технический университет
}
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2.
Vibrational spectroscopy study
of phase transition in K3WO3F3: temperature and high pressure investigations [Text] / Ekimov A.A.Krylov A.S. [et al.]> //
Advanced inorganic
fluorides
: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 188 . - ISBN 978-5-98128-036-8
Доп.точки доступа:
Ekimov, A. A.; Krylov, A. S.; Крылов, Александр, Сергеевич; Vtyurin, A. N.; Ivanenko, A. A.; Иваненко, Александр, Анатольевич; Shestakov, N. P.; Шестаков, Николай, Петрович; Goryainov, S. V.; Kocharova, A. G.; Кочарова, Алла, Георгиевна; "Advanced inorganic
fluorides
", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
}
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3.
Unusual sequence of
phase transitions in (NH4)3TiF7 detected by optic and calorimetric studies / S. V. Mel'nikova [et al.]> // J. Fluor. Chem. - 2014. -
Vol. 165
. - P. 14-19,
DOI
10.1016/j.jfluchem.2014.05.016. - Cited References: 13. - This work was supported by Russian Foundation for Basic Research (Grant no. 12-02-00056), and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (Grant no. NSh-924.2014.2). . - ISSN 0022-1139. - ISSN 1873-3328
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
DIFFRACTION
NH4F
Кл.слова (ненормированные):
Cubic
fluorides
--
Phase transitions
--
Crystal-optic
--
Calorimetry
Аннотация:
For the first time structural transformations were observed for one of the compounds belonging to the family of double salt
fluorides
A3MeF7 = A2MeF6·AF. Single crystals of (NH4)3TiF7 = (NH4)2TiF6·NH4F were grown by evaporation of the aqueous solution. Polarizing optical observations, heat capacity and birefringence Δn = (no − ne) measurements were performed in a wide temperature range 100–400 K. Two reversible, first order structural phase transitions were found to be followed by an unusual sequence of symmetry changes: cubic (G3) (T2↓ = 287.5 K; T2↑ = 291–310 K) ↔ P4/mnc (G2) (T1↓ = 358.5 K; T1↑ = 360 K) ↔ 4/m (G1). The twin structures observed were described assuming the existence of cubic parent phase G0 with P m 3 ¯ m symmetry.
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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia
Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation for Basic Research [12-02-00056]; Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-924.2014.2]
}
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4.
Thermal, structural, optical,
dielectric and barocaloric properties at ferroelastic phase transition in trigonal (NH4)2SnF6: A new look at the old compound / I. N. Flerov [et al.]> // J. Fluor. Chem. - 2016. -
Vol. 183
. - P. 1-9,
DOI
10.1016/j.jfluchem.2015.12.010. - Cited References: 25. - The reported study was partially supported by RFBR, research project No. 15-02-02009a. . - ISSN 0022-1139
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
Heat-capacity
Ammonium
(NH4)3TiF7
Pressure
Кл.слова (ненормированные):
Fluorides
--
Structural disorder
--
Phase transitions
--
Entropy
--
Barocaloric effect
Аннотация:
Structural phase transition P-3m1 → P-1 of the first order and nonferroelectric nature was found in (NH4)2SnF6 at about 110 K in the process of thermal, optical, dielectric and X-ray studies. Order-disorder transformation is accompanied by large changes of entropy (ΔS0 = 16.4 J/mol K) and volume (ΔV0/V ≈ 1%). The structural model associated with three orientations of NH4 tetrahedra in P-3m1 phase and their complete ordering in P-1 phase was suggested with the entropy change (ΔS0 = 18.3 J/mol K) close to the experimental value. A good agreement between baric coefficients measured in a direct way (dT0/dp = -157 K/GPa) and evaluated using entropy and volume changes at phase transition (-170 K/GPa) was found. Barocaloric effects in (NH4)2SnF6 are comparable with those of known solid state refrigerants and are characterised by a low-pressure need for realising their maximum values. © 2015 Elsevier B.V. All rights reserved.
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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Akademgorodok 50, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian State University, Krasnoyarsk, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation
Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
}
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5.
Thermal properties of
(NH4)2MeF6·NH4F (Me: Ti, Sn) crystals undergoing transformation between two cubic phases / E. I. Pogoreltsev [et al.]> // Ferroelectrics. - 2016. -
Vol. 501
,
Is. 1
. - P. 20-25,
DOI
10.1080/00150193.2016.1198659. - Cited References: 9. - The reported study was partially supported by RFBR, research project No 15-02-02009-a . - ISSN 0015-0193
Перевод заглавия:
Тепловые свойства кристаллов (NH4)2MeF6ћNH4F (Me: Ti, Sn) претерпевающих трансформацию между двумя кубическими фазами
Кл.слова (ненормированные):
Phase transitions
--
fluorides
--
heat capacity
--
entropy
--
phase diagram
Аннотация:
The heat capacity, thermal expansion, and T-p phase diagrams of (NH4)3TiF7 and (NH4)3SnF7 were studied in wide temperature and pressure ranges. The total excess entropies at successive Pa-3 ↔ P4/mnc ↔ 4/m (Ti) and single Pa-3 ↔ Pm-3m (Sn) phase transitions are close to each other and characteristic for the order–disorder processes. The Pm-3m cubic phase and direct Pa-3 ↔ Pm-3m transformation were found at high pressure in (NH4)3TiF7. The different sign of baric coefficients for phase transition between two cubic phases in (NH4)3TiF7 and (NH4)3SnF7 was supposed due to nonlinear phase boundary with pressure in the latter fluoride.
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Держатели документа:
Kirensky Institute of Physics, Siberian Department of RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronic, Siberian State University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Department of RAS, Vladivostok, Russian Federation
Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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6.
Thermal properties and
phase transitions in (NH4) 3ZrF7 / V. D. Fokina [et al.]> // Journal of Fluorine Chemistry. - 2013. -
Vol. 154
. - P. 1-6,
DOI
10.1016/j.jfluchem.2013.07.001 . - ISSN 0022-1139
Кл.слова (ненормированные):
Cubic
fluorides
--
Entropy
--
Permittivity
--
Phase transitions
--
Pressure effect
--
Thermal dilatation
Аннотация:
The heat capacity, thermal dilatation, permittivity, and T-p phase diagram of (NH4)3ZrF7 have been studied in wide temperature and pressure ranges. Two phase transitions were found in addition to previously known structural transformations. The stability of crystal phases to temperature and pressure has been examined and a possibility of transition between two cubic phases has been discussed. The total excess entropy change SDSi = Rln6 is characteristic for the order-disorder processes, but its stepwise increase is not consistent with the structural model associated with the strong disorder assumed in the initial cubic phase. В© 2013 Elsevier B.V. All rights reserved.
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Держатели документа:
RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
RAS, Far Eastern Dept, Inst Chem, Vladivostok 690022, Russia
Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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7.
Thermal properties and
phase transition in the fluoride, (NH4)3SnF7 / A. V. Kartashev [et al.]> // J. Solid State Chem. - 2016. -
Vol. 237
. - P. 269-273,
DOI
10.1016/j.jssc.2016.02.027. - Cited References: 18. - This study was partially supported by the Russian Foundation for Basic Research (RFBR), research Project no. 15-02-02009a. . - ISSN 0022-4596
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
Heat-capacity
Chemistry
Кл.слова (ненормированные):
Phase transition
--
Fluorides
--
Heat capacity
--
Entropy
--
Thermal expansion
--
High pressure
Аннотация:
Calorimetric, dilatometric and differential thermal analysis studies were performed on (NH4)3SnF7 for a wide range of temperatures and pressures. Large entropy (δS0=22 J/mol K) and elastic deformation (δ(ΔV/V)0=0.89%) jumps have proven that the Pa-3虠Pm-3m phase transition is a strong first order structural transformation. A total entropy change of ΔS0=32.5 J/mol K is characteristic for the order-disorder phase transition, and is equal to the sum of entropy changes in the related material, (NH4)3TiF7, undergoing transformation between the two cubic phases through the intermediate phases. Hydrostatic pressure decreases the stability of the high temperature Pm-3m phase in (NH4)3SnF7, contrary to (NH4)3TiF7, characterised by a negative baric coefficient. The effect of experimental conditions on the chemical stability of (NH4)3SnF7 was observed. © 2016 Elsevier Inc.
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Держатели документа:
Kirensky Institute of Physics, Siberian Department of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian State University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Institute of Chemistry, Far Eastern Department of the Russian Academy of Sciences, Vladivostok, Russian Federation
Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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8.
The role of
chemical pressure in the formation of the structure and barocaloric properties of complex
fluorides
and oxyfluorides / I. N. Flerov, M. V. Gorev, E. V. Bogdanov, N. M. Laptash> // Crystallogr. Rep. - 2023. -
Vol. 68
,
Is. 5
. - P. 765-778,
DOI
10.1134/S1063774523600485. - Cited References: 67 . - ISSN 1063-7745. - ISSN 1562-689X
Аннотация:
The role of chemical pressure as an effective tool in the processes of formation of initial and distorted (as a result of structural transformations) phases, thermodynamic properties, and direct and inverse barocaloric effects in some complex oxyfluorides and
fluorides
with octahedral, tetrahedral, and spherical anion and cation groups in the structure has been studied. It is found that, due to the small temperature hysteresis and high baric sensitivity of materials, the maximum values of absolute and integral barocaloric characteristics can be implemented at low pressures. Correspondingly, the temperature range of reversibility of thermodynamic cycles based on
fluorides
/oxyfluorides as solid-state coolants can be expanded.
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Публикация на русском языке
Роль химического давления в формировании структуры и барокалорических свойств комплексных фторидов и оксифторидов [Текст] / И. Н. Флёров, М. В. Горев, Е. В. Богданов, Н. М. Лапташ. - 14 с. // Кристаллография. - 2023. - Т. 68 № 5. - С. 776-789
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Branch, Vladivostok, Russia
Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.
}
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9.
Structure-based machine learning
enables discovery of Mn4+-activated red-light
fluorides
for ultrawide-gamut mini-light-emitting diodes / Yu. Wang, W. Tang, Ch. Zhang [et al.]> // Adv. Funct. Mater. - 2024. -
Vol. 34
,
Is. 14
. - Ст. 2313490,
DOI
10.1002/adfm.202313490. - Cited References: 61. - This research was financially supported by the National Key R& D Program of China (Grant No. 2022YFB3503800) and the National Natural Science Foundation of China (Grant Nos. 52202170 and 52322208). This research was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3) . - ISSN 1616-301X. - ISSN 1616-3028
Перевод заглавия:
Структурное машинное обучение позволяет обнаружить Mn4+-активированные фториды красного света для мини-светодиодов со сверхширокой гаммой
Кл.слова (ненормированные):
fluorides
--
mini-light-emitting diodes
--
Mn4+
--
red light
--
wide-gamut displays
Аннотация:
Mn4+-activated
fluorides
with a saturated red color and sharp line emission are ideal for applications in the light-emitting diodes (LEDs) backlight for displays. However, the emissions attributed to 2E→4A2 parity and spin-forbidden transitions limit the design and adjustments of emission wavelength and chromaticity coordinates. Herein, machine learning algorithms are used to build a wavelength-prediction model for Mn4+-activated
fluorides
. The model precisely identifies the key structural features that affect wavelengths and discovers target materials. The predicted candidate Cs2NaAlF6:Mn4+ (CNAF) with a long-wavelength zero-phonon-line emission at 628 nm exhibits a redshift in comparison with other reported Mn4+-activated
fluorides
and commercial K2SiF6:Mn4+, but maintains narrow spectral emission with full-width half maximum (FWHM) of 11.2 nm. The redshift and narrow spectra result in a color purity of 99.7% and Commission Internationale de L'Eclairage (CIE) chromaticity coordinate of (0.7032,0.2967) that is close to the pure red-light point of Recommendation BT. 2020 (Rec. 2020). Moreover, CNAF is prepared as a transparent red-light film, and the device fabricated using the blue-light mini-LEDs, green quantum-dot film, and CNAF film exhibits a wide color-gamut of 121.5% National Television Standards Committee (NTSC) or 90.6% Rec. 2020, suggesting that CNAF has potential for wide-color-gamut displays.
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Держатели документа:
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, P. R. China
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk 660041, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia
Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, China
Доп.точки доступа:
Wang, Yuanjing; Tang, Wenyu; Zhang, Chuang; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ming, Hong; Zhou, Yayun; Peng, Shuai; Song, Enhai; Zhang, Qinyuan
}
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10.
Structure and ordering
processes in A2BWO3F3 oxyfluorides studied by vibrational spectroscopy / Vtyurin A.N.Krylov A.S. [et al.]> //
Advanced inorganic
fluorides
: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 71-74 . - ISBN 978-5-98128-036-8
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр, Николаевич; Krylov, A. S.; Крылов, Александр, Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Ivanenko, A. A.; Иваненко, Александр, Анатольевич; Shestakov, N. P.; Шестаков, Николай, Петрович; Laptash, N. M.; Voit, E. I.; "Advanced inorganic
fluorides
", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
}
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11.
Structural, spectroscopic, and
electronic properties of cubic G0-Rb2KTiOF5 oxyfluoride / V. V. Atuchin [et al.]> // J. Phys. Chem. C. - 2013. -
Vol. 117
,
Is. 14
. - P. 7269-7278,
DOI
10.1021/jp401391y. - Cited References: 80. - This study was supported by SB RAS (Grant 28.13), the National Natural Science Foundation of China under Grants 11174297 and 91022036, and the National Basic Research Project of China (Nos. 2010CB630701 and 2011CB922204). . - ISSN 1932-7447
Перевод заглавия:
Структурные, спектроскопические и электронные свойства кубического оксифторида G0-Rb2KTiOF5.
РУБ
Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
RAY PHOTOELECTRON-SPECTROSCOPY
SURFACE CHEMICAL-STABILITY
EFFECTIVE IONIC-RADII
PHASE-TRANSITIONS
CRYSTAL-GROWTH
HEAT-CAPACITY
CORE LEVELS
RB2KTIOF5
FLUORIDES
OXIDES
Аннотация:
The G0-Rb2KTiOF5 single crystals with dimensions up to nearly a centimeter in size have been prepared by slow solidification method. The elpasolite-related crystal structure of G0-Rb2KTiOF5 has been refined by Rietveld method at T = 298 K (space group Fm (3) over barm, Z = 4, a = 8.880(1) angstrom, V = 700.16(2) angstrom(3); R-B = 2.66%). The wide optical transparency range of 0.25-9 mu m and forbidden band gap of E-g = 3.87 eV have been obtained for the G0-Rb2KTiOF5 crystal. Dominating photoluminescence bands at 3.36 and 2.33 eV are related to free and self-trapped excitons, respectively. The electronic structure of G0-Rb2KTiOF5 has been evaluated by X-ray photoelectron spectroscopy and calculated with the first-principles methods. A good agreement between theoretical and experimental results has been achieved. Chemical bonding effects have been discussed for all metal ions using binding energy difference parameters and a wide comparison with related oxides and
fluorides
. The competition between O2- and F- ions for metal valence electrons has been found.
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Держатели документа:
Russian Acad Sci, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Russian Acad Sci, Inst Geol & Mineral, Lab Crystal Growth, Siberian Branch, Novosibirsk 630090, Russia
Russian Acad Sci, Inst Semicond Phys, Lab Phys Bases Integrated Microelect, Siberian Branch, Novosibirsk 630090, Russia
Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Funct Crystals & Laser Technol, BCCRD, Beijing 100190, Peoples R China
Russian Acad Sci, Siberian Branch, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Доп.точки доступа:
Atuchin, V. V.; Isaenko, L. I.; Kesler, V. G.; Kang, L.; Lin, Z. S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yelisseyev, A. P.; Zhurkov, S. A.
}
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12.
Structural transformation between
two cubic phases of (NH4)3SnF7 / I. N. Flerov [et al.]> // J. Fluor. Chem. - 2015. -
Vol. 178
. - P. 86-92,
DOI
10.1016/j.jfluchem.2015.06.024. - Cited References: 19. - We thank T.A. Kaidalova for the idea of doubling the unit cell parameter of (NH4)3SnF7 at room temperature. The reported study was partially supported by RFBR, research project No. 15-02-02009 a. . - ISSN 0022-1139
Перевод заглавия:
Структурный переход между двумя кубическими фазами в (NH4)3SnF7
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
TRANSITION
NH4F
Кл.слова (ненормированные):
Cubic
fluorides
--
Phase transitions
--
X-ray
--
Calorimetry
--
Crystal optics
Аннотация:
Reinvestigations of the room temperature structure of ammonium heptafluorostannate (NH4)3SnF7 = (NH4)2SnF6·NH4F = (NH4)3[SnF6]F by both powder and single crystal X-ray diffractions have revealed that its real symmetry is Pa−3 (Z = 8) instead of Pm−3m (Z = 1) suggested earlier. Polarizing optical observations, heat capacity, X-ray powder, and single crystal measurements were performed in a wide temperature range (100–420 K). A reversible structural phase transition of the first order between two cubic modifications Pa−3 ↔ Pm−3m was found at about T0 = 360 K. The structural models associated with partially disordered and totally ordered high and low temperature phases, respectively, comply with a large value of phase transition entropy.
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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation
Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Udovenko, A. A.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович
}
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13.
Structural phase transitions
in elpasolite-like
fluorides
comprising rare earth elements – Raman scattering study / A. N. Vtyurin [et al.]> //
3th Int. Conf. "Scanning Probe Microscopy". 4th Russia-China Workshop on Dielectric and Ferroel. Mater. (SPM-2019-RCWDFM). Int. Youth Conf. "Functional Imaging of Nanomaterials" : Abstract book of joint int. conf. - 2019. - P. 29 . - ISBN 978-5-9500624-2-1
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Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS, 660036, Krasnoyarsk, Russia
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Scanning Probe Microscopy, International Conference(3 ; 2019 ; Aug. ; 25-28 ; Ekaterinburg); Russia-China Workshop on Dielectric and Ferroelectric Materials(4 ; 2019 ; Aug. ; 25-28 ; Ekaterinburg); "Functional Imaging of Nanomaterials", International Youth Conference(2019 ; Aug. ; 25-28 ; Ekaterinburg)
}
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14.
Structural Phase Transitions
in Ammonium Oxofluoromolybdate (NH4)2MoO2F4 [Text] / A. D. Vasiliev, N.M. Laptash> //
Advanced inorganic
fluorides
: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 187 . - ISBN 978-5-98128-036-8
Доп.точки доступа:
Vasiliev, A. D.; Васильев, Александр Дмитриевич; Laptash, N. M.; "Advanced inorganic
fluorides
", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
}
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15.
Structural phase transition
in (NH4)3GeF7– Raman spectroscopy data / Y. Gerasimova, N. Laptash, A. Krylov [et al.]> // Crystals. - 2021. -
Vol. 11
,
Is. 5
. - Ст. 506,
DOI
10.3390/cryst11050506. - Cited References: 22. - This research was partially funded by RFBR and DFG, project No. 21-52-12018 . - ISSN 2073-4352
Перевод заглавия:
Структурный фазовый переход в (NH4)3GeF7 – по данным комбинационного рассеяния
Кл.слова (ненормированные):
fluorides
--
Raman spectra
--
lattice disordering
Аннотация:
We obtained Raman spectra of (NH4)3GeF7 crystals with a wide range of frequencies (10–3400 cm−1) and temperatures (8–300 K), including phase transition, which was accompanied by a symmetry increase with a temperature decrease. The internal vibrations of the GeF62− group were classified by the positional symmetry method. Considerable transformations of the Raman spectra were observed at the lower frequency range of lattice vibrations and the ranges of the internal vibrations of the ammonium ions. In contrast, the internal modes of the GeF62− groups changed only slightly due to their resonance splitting in the multiplied unit cell, which agreed well with the proposed phase transition mechanism induced by ammonium group ordering.
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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Доп.точки доступа:
Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Laptash, N. M.; Krylov, A. S.; Крылов, Александр Сергеевич; Vonog, V.; Vtyurin, A. N.; Втюрин, Александр Николаевич
}
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16.
Reconstructive phase transition
in (NH4)3TiF7 accompanied by the ordering of TiF6 octahedra / M. S. Molokeev [et al.]> // Acta Crystallogr. B. - 2014. -
Vol. 70
. - P. 924-931,
DOI
10.1107/S2052520614021192. - This study was supported by Russian Fund of Basic Research, project No. 12-02-00056 a . - ISSN 0108-7681. - ISSN 1600-5740
Перевод заглавия:
Реконструктивный фазовый переход в (NH4)3TiF7, сопровождающийся упорядочением октаэдров TiF6
РУБ
Crystallography
Рубрики:
CRYSTAL-STRUCTURE
NEUTRON-DIFFRACTION
POWDER DIFFRACTION
FLUORIDES
DISORDER
MECHANISM
PATHWAYS
COMPLEX
LI3THF7
ALPHA
Кл.слова (ненормированные):
reconstructive phase transition
--
ammonium heptafluorotitanate
--
order-disorder transition
Аннотация:
An unusual phase transition P4/mnc →Pa3 has been detected after cooling the (NH4)3TiF7 compound. Some TiF6 octahedra, which are disordered in the room-temperature tetragonal structure, become ordered in the low-temperature cubic phase due to the disappearance of the fourfold axis. Other TiF6 octahedra undergo large rotations resulting in huge displacements of the F atoms by 1.5-1.8 Å that implies a reconstructive phase transition. It was supposed that phases P4/mbm and Pm3m could be a high-temperature phase and a parent phase, respectively, in (NH4)3TiF7. Therefore, the sequence of phase transitions can be written as Pm3m → P4/bm → P4/mnc → Pa3. The interrelation between (NH4)3TiF7, (NH4)3GeF7 and (NH4)3PbF7 is found, which allows us to suppose phase transitions in relative compounds.
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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian State Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia
Inst Chem, Vladivostok 660022, Russia
Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Misjul, S. V.; Мисюль, Сергей Валентинович; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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17.
Raman scattering and
phase transitions in
fluorides
with elpasolite structure / A. N. Vtyurin [et al.]> //
Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016) : book of abstracts. - 2016. - Ст. Oral-29. - References: 8
Перевод заглавия:
Комбинационное рассеяние света и фазовые переходы в фторидах со структурой эльпасолита
Материалы конференции
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(2016 ; Jun. ; 19-23 ; Matsue, Japan)
}
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18.
Raman scattering and
phase transitions in
fluorides
with elpasolite structure / A. Vtyurin [et al.]> //
Ferroelectrics : Proceedings of the Joint International Symposium. - 2017. -
Vol. 512
,
Is. 1
. - P. 58-64,
DOI
10.1080/00150193.2017.1349863. - Cited References: 22 . - ISSN 0015-0193
Кл.слова (ненормированные):
Ferroelectric materials
--
Ferroelectricity
--
Elpasolite
--
First-order phase transitions
--
Fluorescence process
--
Raman lines
--
Raman scattering spectra
--
Temperature phase
--
Temperature range
--
Raman scattering
Аннотация:
Raman scattering spectra of Rb2KHoF6 and Rb2KDyF6 crystals have been studied in temperature range from 20 K to 399 K and from 7 K to 500 K respectively. Raman spectra of Rb2KHoF6 crystal are distorted due to the fluorescence process. Parameters of Raman lines have been quantitatively analyzed. The investigation points to the considerable role of CX6 groups in the temperature phase transition in Rb2KHoF6 and Rb2KDyF6 crystals. The anomalies of spectra changes with temperature testify the first order phase transitions in these crystals. © 2017 Taylor & Francis Group, LLC.
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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; June 19-24 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(8 ; June 19-24, 2016 ; Matsue, Japan)
}
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19.
Pressure and Temperature
dependence of Raman spectra in Rb2KTiOF5 [Text] / Krylov A.S.Goryainov S.A. [et al.]> //
Advanced inorganic
fluorides
: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 188 . - ISBN 978-5-98128-036-8
Доп.точки доступа:
Krylov, A. S.; Крылов, Александр, Сергеевич; Goryainov, S. A.; Vtyurin, A. N.; Втюрин, Александр, Николаевич; Voronov, V. N.; Воронов, Владимир, Николаевич; Laptash, N. M.; "Advanced inorganic
fluorides
", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
}
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20.
Phase transitions in
perovskite-like
fluorides
studied by Raman spectroscopy [Текст] / S. N. Krylova [и др.]> // The 5th International Conference on Perspectives in Vibrational Spectroscopy ICOPVS-2014. - 2014. - С. 12
DOI
10.13140/2.1.2959.0408
Перевод заглавия:
Фазовые переходы в перовскитоподобных фторидах исследование методом
Аннотация:
Since the discovery of Raman phenomenon the Raman spectroscopy has been considered as an efficient technique to study the structure and lattice dynamics of crystals. The creation of the monochromatic radiation laser sources has revolutionized this classical field of vibrational spectroscopy and provided an impetus to create new ones. It is established that inelastic light scattering contains valuable information on the crystal structure, phonon spectrum, mechanisms of electron-phonon and phonon-phonon.
Phase transitions in perovskite-like
fluorides
studied by Raman spectroscopy Krylova S.a, Krylov A.a, Voronov V.a and Vtyurin A.a a Akademgorodok 50/38, Krasnoyarsk, 660036, L. V. Kirensky Institute of physics SB RAS, Russia, slanky@iph.krasn.ru Since the discovery of Raman phenomenon the Raman spectroscopy has been considered as an efficient technique to study the structure and lattice dynamics of crystals. The creation of the monochromatic radiation laser sources has revolutionized this classical field of vibrational spectroscopy and provided an impetus to create new ones. It is established that inelastic light scattering contains valuable information on the crystal structure, phonon spectrum, mechanisms of electron-phonon and phonon-phonon interactions. Obtaining this information is an important task of the solid state spectroscopy. Such experiments are necessary to investigate new crystalline materials and structures. During last decades many crystals with a complex structure were synthesized. They became new objects of fundamental solid-state physics as the perspective materials for practical use. There is a perovskite-like family including perovskites, elpasolites, layered perovskites, cryolites and other crystals with octahedral molecular ions. Perovskites are model objects to study phase transitions in crystals. The family includes the majority of modern inorganic materials applied in nonlinear optics and quantum electronics. Some of the perovskite-like materials are ferroelectrics, piezoelectrics or superconductors. This work shows the possibilities of Raman spectroscopy with reference to the phase transition investigations of some perovskite-like
fluorides
. It is shown that Raman spectroscopy provides the opportunity for understanding the phase transition mechanisms and estimating the behavior of ion groups at phase transition. It is shown by Raman spectroscopy that the temperature transitions from cubic into low symmetry phases in Rb2KScF6, Rb2KInF6, Rb2NaYF6 crystals result from the lattice instability caused by the MeF63+ octahedral ion tilting [1, 2]. The experimental data and results of the numerical simulations reveal that the phase transitions in the Rb2KTiOF5 crystal are due to the orientational ordering of the TiOF5 groups, but new phases remain partially disordered as well [3]. The temperature phase transitions in the (NH4)2WO2F4 crystal are caused by the ordering of molecular quasi-octahedral groups [WO2F4]2– and ammonium groups [4]. Acknowledgements This work was partly supported by the Russian Foundation for the Basic Research project no. 12-02-00056, no. 13-02-00825, and integration project SB RAS
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Доп.точки доступа:
Krylova, S. N.; Крылова, Светлана Николаевна; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; International Conference on Perspectives in Vibrational Spectroscopy (5 ; 2014 ; 8-12 July ; Trivandrum, India)
}
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