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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'menko A. M., Mukhin A. A., Ivanov V. Y., Kadomtseva A. M., Lebedev S. P., Bezmaternykh L. N.
Заглавие : Antiferromagnetic Resonance and Dielectric Properties of Rare-earth Ferroborates in the Submillimeter Frequency Range
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 1. - P113-120. - ISSN 1063-7761, DOI 10.1134/S106377611105013X
Примечания : Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project no. 10-02-00846.
Предметные рубрики: GDFE3(BO3)(4)
SPECTROSCOPY
CRYSTAL
Ключевые слова (''Своб.индексиров.''): antiferromagnetic resonance--basic parameters--effective anisotropy constant--ferroborates--ferroics--ferromagnetic orderings--frequency ranges--magnetic interactions--magnetoresonance--millimeter frequency range--rare earth ions--submillimeters--antiferromagnetic materials--crystallography--erbium--europium--ferromagnetic resonance--ion exchange--magnetic anisotropy--magnetic devices--magnetic structure--permittivity--resonance--antiferromagnetism
Аннотация: The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe(3)(BO(3))(4) (R = Y, Eu, Pr, Tb, Tb(0.25)Er(0.75)), are studied in the submillimeter frequency range (nu = 3-20 cm(-1)). Ferroborates with R = Y, Tb, and Eu exhibit permittivity jumps at temperatures of 375, 198, and 58 K, respectively, which are caused by the R32 - P3(1)2(1) phase transition. Antiferromagnetic resonance (AFMR) modes in the subsystem of Fe(3+) ions are detected in the range of antiferromagnetic ordering (T T(N)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wei, Y.i., Yang, Hang, Gao, Zhiyu, Xing, Gongcheng, Molokeev M. S., Li, Guogang
Заглавие : Bismuth activated full spectral double perovskite luminescence materials by excitation and valence control for future intelligent LED lighting
Место публикации : Chem. Commun. - 2020. - Vol. 56, Is. 64. - P.9170-9173. - ISSN 1359-7345, DOI 10.1039/d0cc03975f. - ISSN 1364-548X(eISSN)
Примечания : Cited References: 27. - This work was supported by the National Natural Science Foundation of China (Grant No. 51672259) and the Fundamental Research Funds for the National Universities, China University of Geosciences (Wuhan) (No. 1910491T02)
Предметные рубрики: PHOTOLUMINESCENCE
PHOSPHORS
Bi3+
MODULATION
CRYSTAL
Аннотация: A novel La2Mg1.14Zr0.86O6:Bi3+ double perovskite phosphor with excitation-induced blue/green photoluminescence tuning is reported. By designing Bi3+ → Eu3+ energy transfer, single-composition white light with wide-scale adjustable corrected color temperatures (CCTs) is successfully achieved. This work initiates a new insight to explore phosphors with excitation-induced photoluminescence tuning and wide CCT control for future intelligent LED lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskii M. S., Shinkorenko A. S., Zinenko V. I.
Заглавие : Calculation of lattice dynamics, elastic and dielectric properties of γ-BiB3O6 and δ-BiB3O6
Коллективы : Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" [NSh-924.2014.2]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 4. - P.675-682. - ISSN 1063, DOI 10.1134/S1063783415040241. - ISSN 10906460(eISSN)
Примечания : Cited References:14. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" (grant no. NSh-924.2014.2).
Предметные рубрики: BISMUTH BORATE BiB3O6
OPTICAL-PROPERTIES
CRYSTAL
RAMAN
Аннотация: The crystal lattice vibration frequencies, densities of phonon states, elastic moduli, and high-frequency permittivities have been calculated in terms of the density functional theory method for two polymorphs γ-BiB3O6 and δ-BiB3O6. Based on the calculated densities of phonon states, the temperature dependences of the free energies of two considered bismuth triborate modifications have been constructed, and the temperature of the phase transition between these modifications has been determined (1100 K). The structure of a possible nonpolar praphase of δ-BiB3O6 has been proposed. The polarization of δ-BiB3O6 has been estimated as 131 μC/cm2.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Antonova A.B., Chudin O.S., Pavlenko N.I., Sokolenko W.A., Rubaylo A.I., Vasiliev A. D., Semeikin O.V.
Заглавие : Chemistry of vinylidene complexes. XVIII. Synthesis and molecular structure of the novel trinuclear mu(3)-vinylidene complex CpReFePt(mu(3)-C=CHPh)(CO)(6)(PPh(3))
Место публикации : J. Organomet. Chem. - 2009. - Vol. 694, Is. 1. - P.127-130. - ISSN 0022-328X, DOI 10.1016/j.jorganchem.2008.08.037
Примечания : Cited Reference Count: 17. - Гранты: This work was supported by the Council of the Russian Federation President for Support of Young Scientists and Leading Scientific Schools (Project No. NSch-4137.2006.2) and the Krasnoyarsk Regional Science Foundation (Grants 10TS145 and 17G002).Финансирующая организация: Council of the Russian Federation President for Support of Young Scientists and Leading Scientific Schools [NSch-4137.2006.2]; Krasnoyarsk Regional Science Foundation [10TS145, 17G002]
Предметные рубрики: CLUSTERS
CRYSTAL
MNFEPT
Ключевые слова (''Своб.индексиров.''): vinylidene complexes--heterometallic clusters--rhenium--iron--platinum--crystal structure--crystal structure--heterometallic clusters--iron--platinum--rhenium--vinylidene complexes--atomic physics--atoms--bond length--chemical bonds--coordination reactions--crystal structure--iron compounds--nuclear magnetic resonance--nuclear magnetic resonance spectroscopy--platinum--quantum chemistry--rhenium--rhenium compounds--bond angles--co groups--double bonds--fe atoms--heterometallic--heterometallic clusters--pt atoms--trimetallic--vinylidene complexes--x-ray diffractions--platinum compounds
Аннотация: The interaction between Cp(CO)(2)RePt(mu-C=CHPh)(PPh(3))(2) (1) and Fe(2)(CO)(9) afforded the new heterometallic mu(3)-vinylidene cluster CpReFePt(mu(3)-C=CHPh)(CO)(6)(PPh(3)) (2). An X-ray diffraction study shows the complex 2 possesses a trimetallic Re-Fe-Pt chain core. The bond lengths are Re-Fe 2.8221(8), Fe-Pt 2.5813(8) angstrom; the Re center dot center dot center dot Pt distance is 3.3523(7) angstrom; the bond angle Re-Fe-Pt is 76.55(3)degrees. The mu(3)-C=CHPh ligand is eta(1)-bound to the Re and Pt atoms and eta(2)-coordinated to the Fe atom. The C=C bond length is 1.412(4) angstrom. The Pt atom is coordinated by the PPh(3) and CO groups. Complex 2 is characterized by the IR and (1)H, (13)C and (31)P NMR spectra. (C) 2008 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Аплеснин, Сергей Степанович, Udod L. V., Sitnikov M. N., Eremin E. V., Molokeev M. S., Tarasova L. S., Yanushkevich K. I., Galyas A. I.
Заглавие : Correlation of the magnetic and transport properties with polymorphic transitions in bismuth pyrostannate Bi2(Sn1 − xCr x)2O7
Коллективы : Russian Foundation for Basic Research [15-02-01445-a], Ministry of Education and Science of the Russian Federation [114090470016]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 8. - P.1627-1632. - ISSN 1063-7834, DOI 10.1134/S1063783415080028
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research (project no. 15-02-01445-a) and the Ministry of Education and Science of the Russian Federation (state task no. 114090470016).
Предметные рубрики: GAS SENSORS
Bi2Sn2O7
CRYSTAL
Аннотация: The correlation of the electrical, magnetic, and structural properties of Bi2(Sn1 − xCrx)2O7 solid solutions has been investigated for two compositions with x = 0.05 and 0.1. The temperatures of structural phase transitions and anomalies of the electrical resistance in the vicinity of these transitions at temperatures in the range 300 K ˂ T ˂ 1000 K have been determined using differential scanning calorimetry. It has been found that the thermoelectric power changes sign upon the polymorphic transition. The paramagnetic Curie temperature and the chromium-ion spin have been found from the temperature dependence of the magnetic susceptibility in the range 4 K ˂ T ˂ 1000 K and from the field dependence of the magnetic moment in magnetic fields of up to 6 T.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Vyunishev A. M., Zaitsev A. I., Ikonnikov A. A., Pospelov G. I., Slabko V. V., Zhokhova A. A.
Заглавие : Deep UV generation and fs pulses characterization using strontium tetraborate
Коллективы : Nonlinear Optics and Applications (5; 2011 ; Apr. ; 19-21; Prague, Czech Republic)
Место публикации : Proc. of SPIE: SPIE-Int. Soc. Optical Engineering, 2011. - Vol. 8071. - Ст.80710K. - ISSN 0277-786X, DOI 10.1117/12.886189. - ISSN 978-0-81948-661-5
Примечания : Cited References: 12
Предметные рубрики: CRYSTAL
Ключевые слова (''Своб.индексиров.''): nonlinear photonic crystal--strontium tetraborate--second harmonic generation--random quasi phase matching--ultrafast diagnostics
Аннотация: The properties of NPC structures in strontium tetraborate are analyzed. Different types of NPC structures are revealed that possess different nonlinear properties, and their spectral dependences of frequency conversion efficiency are calculated and compared. Experimental study of these structures is reported for the process of doubling of the second harmonic of fs Ti:S laser. Tuning of generated radiation is obtained in the range 187.5 - 232.5 nm, with extreme insensitivity to the angular orientation of NPC. Behavior of tuning curve along investigated fundamental wave range is similar in all studied samples, but efficiency obtained depends on the type of structure. Conversion efficiency and spectral quality of generated radiation is experimentally shown to grow better when using NPC with improved structure. Prospects of VUV converter on a single NPC are discussed. NPCs of SBO are demonstrated to be useful for autocorrelation diagnostics both in random QPM geometry and in the geometry of nonlinear diffraction from virtual beam.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Romanova O. B., Kretinin V. V., Aplesnin S. S., Sitnikov M. N., Udod L. V., Yanushkevich K. I.
Заглавие : Electrical properties of the polycrystalline BiFe0.95Co0.05O3 films
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Belarusian Republican Foundation for Basic Research [20-52-00005]
Место публикации : Phys. Solid State. - 2021. - Vol. 63. Is. 6. - P.897-903. - ISSN 1063-7834, DOI 10.1134/S1063783421060184. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 34. - This study was supported by the Russian Foundation for Basic Research and the Belarusian Republican Foundation for Basic Research, project no. 20-52-00005
Предметные рубрики: BiFeO3 THIN-FILMS
PHASE-SEPARATION
CRYSTAL
MODEL
Аннотация: Semiconductor BiFe0.95Co0.05O3 thin-film compounds have been synthesized by a burst technique. The film surface morphology and the effect of electronic doping via substitution of cobalt ions for trivalent iron on the optical, magnetic, and kinetic properties have been investigated in the temperature range of 77-600 K in magnetic fields of up to 12 kOe. Two electron relaxation channels have been found in the impedance spectrum in the frequency range of 0.1-1000 kHz. The negative magnetoresistance in the anomalous magnetization region and the maximum magnetoimpedance in the vicinity of the surface phase transition have been established. Using the Hall measurements, carrier types dominating in the magnetoresistance and magnetoimpedance effects have been determined. The magnetization anomalies have been explained in the model of superparamagnetic clusters and the magnetoresistance, by the carrier scattering by spin fluctuations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Dongjie, Yun, Xiaohan, Li, Guogang, Dang, Peipei, Molokeev M. S., Lian, Hongzhou, Shang, Mengmeng, Lin, Jun
Заглавие : Enhanced cyan emission and optical tuning of Ca3Ga4O9:Bi3+ for high-quality full-spectrum white light-emitting diodes
Место публикации : Adv. Opt. Mater. - 2020. - Vol. 8, Is. 22. - Ст.2001037. - ISSN 2195-1071, DOI 10.1002/adom.202001037
Примечания : Cited References: 55. - This work was financially supported by the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51672265, 51672266, 51672257 and 51672259), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDY-SSW-JSC018), Science and Technology Cooperation Project between Chinese and Australian Governments (2017YFE0132300), the Jiangmen Innovative Research Team Program (2017), and the Major Program of Basic Research and Applied Research of Guangdong Province (2017KZDXM083)
Предметные рубрики: ENERGY-TRANSFER
TUNABLE LUMINESCENCE
PHOSPHOR
CRYSTAL
MODULATION
Аннотация: Highly efficient cyan‐emitting phosphor materials are indispensable for closing the cyan gap in spectra of the traditional phosphor‐converted white light‐emitting diodes (WLEDs) to achieve high‐quality full‐spectrum white lighting. In this work, bright cyan‐emitting Ca3Ga4O9 (CGO):0.02Bi3+,0.07Zn2+ phosphor is developed to bridge the cyan gap. Such a Bi3+,Zn2+ codoping enhances the cyan emission of CGO:0.02Bi3+ by 4.1 times due to the influence of morphology and size of phosphor particles, charge compensation and lattice distortion. Interestingly, codoping La3+ ions into the current system can achieve a photoluminescence tuning of CGO:0.02Bi3+ from cyan to yellowish‐green by crystallographic site engineering. Besides, Bi3+–Eu3+ energy transfer is successfully realized in CGO:0.02Bi3+,0.07Zn2+,nEu3+ phosphors and the emission color tuning from cyan to orange is observed. The investigation of thermal quenching behaviors reveals that the incorporation of Zn2+ and La3+ improves the thermal stability of CGO:0.02Bi3+. Finally, CGO:0.02Bi3+,0.07Zn2+,0.10Eu3+ phosphor is employed to obtain a single‐phased warm WLED device. A full‐spectrum WLED device with remarkable color rendering index (Ra) of 97.4 and high luminous efficiency of 69.72 lm W−1 is generated by utilizing CGO:0.02Bi3+,0.07Zn2+ phosphor. This result suggests the important effect of CGO:0.02Bi3+,0.07Zn2+ phosphor on closing the cyan gap, providing new insights of cyan‐emitting phosphors applied in full‐spectrum white lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jorio A., Currat R., Myles DAA, McIntyre G. J., Aleksandrova I. P., Kiat J. M., Saint-Gregoire P.
Заглавие : Ferroelastic phase transition in Cs3Bi2I9: A neutron diffraction study
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2000. - Vol. 61, Is. 6. - P3857-3862. - ISSN 1098-0121, DOI 10.1103/PhysRevB.61.3857
Примечания : Cited References: 16
Предметные рубрики: CRYSTAL
SCATTERING
CS3SB2I9
Аннотация: Crystalline Cs3Bi2I9, With the P6(3)/mmc symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At T-0 = 220 K the crystal undergoes a second-order proper ferroelastic phase transition to a polydomain structure with a nonprimitive monoclinic C12/m1 space group. Satellites were not found below T-0, indicating that the continuous distribution of sites observed in previous I-127 nuclear quadrupole resonance experiments is due either to an undetected incommensurate phase characterized by a very small displacement amplitude, or due to the fraction of the crystal volume occupied by domain walls. We argue that thick domain walls are expected in the present structure due to the absence of mechanical compatibility between domains.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trabs, Peter, Noack, Frank, Aleksandrovsky A. S., Zaitsev A. I., Petrov, Valentin
Заглавие : Generation of coherent radiation in the vacuum ultraviolet using randomly quasi-phase-matched strontium tetraborate
Место публикации : Opt. Lett.: Optical Society of America, 2016. - Vol. 41, Is. 3. - P.618-621. - ISSN 0146-9592, DOI 10.1364/OL.41.000618. - ISSN 1539-4794(eISSN)
Примечания : Cited References:15
Предметные рубрики: Crystal
SrB4O7
nm
Аннотация: Tunable coherent radiation is generated in the vacuum ultraviolet down to 121 nm using random quasi-phase matching in strontium tetraborate, the shortest wavelength ever produced with a second-order nonlinear optical process in a solid-state material. Relevant properties of this radiation, the nonlinear process, and the nonlinear crystal are investigated.
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