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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Savina A. A., Atuchin V. V., Solodovnikov S. F., Solodovnikova Z. A., Krylov A. S., Maximovsky E. A., Molokeev M. S., Oreshonkov A. S., Pugachev A. M., Khaikina E. G.
Заглавие : Synthesis, structural and spectroscopic properties of acentric triple molybdate Cs2NaBi(MoO4)3
Коллективы : Russian Foundation for Basic Research [4828.2012.2, 12-02-31205]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]
Место публикации : J. Solid State Chem. - 2015. - Vol. 225. - P.53–58. - ISSN 0022-4596, DOI 10.1016/j.jssc.2014.11.023. - ISSN 1095-726X
Примечания : Cited References: 66. - The authors are grateful to Dr. K.M. Khal'baeva and Dr. Irina A. Gudkova for their assistance in preparing the compound and taking X-ray single-crystal diffraction data. This study is partly supported by the Russian Foundation for Basic Research (Grants 13-03-01020 and 14-03-00298). V.V.A., A.S.K. and A.S.O. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for a partial financial support.
Предметные рубрики: CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
VIBRATIONAL PROPERTIES
RAMAN-SPECTROSCOPY
HYDROTHERMAL SYNTHESIS
DIELECTRIC-PROPERTIES
SELECTIVE OXIDATION;
BISMUTH MOLYBDATES
IONIC-CONDUCTIVITY
OPTICAL-PROPERTIES
Ключевые слова (''Своб.индексиров.''): triple molybdate--sodium--cesium--bismuth--crystal structure--raman spectroscopy--crystal-structure--single-crystals--vibrational properties--raman-spectroscopy--hydrothermal synthesis--dielectric-properties--selective oxidation;--bismuth molybdates--ionic-conductivity--optical-properties
Аннотация: New ternary molybdate Cs2NaBi(MoO4)3 is synthesized in the system Na2MoO4–Cs2MoO4–Bi2(MoO4)3. The structure of Cs2NaBi(MoO4)3 of a new type is determined in noncentrosymmetric space group R3c, a=10.6435(2), c=40.9524(7) Å, V=4017.71(13) Å3, Z=12 in anisotropic approximation for all atoms taking into account racemic twinning. The structure is completely ordered, Mo atoms are tetrahedrally coordinated, Bi(1) and Bi(2) atoms are in octahedra, and Na(1) and Na(2) atoms have a distorted trigonal prismatic coordination. The Cs(1) and Cs(2) atoms are in the framework cavities with coordination numbers 12 and 10, respectively. No phase transitions were found in Cs2NaBi(MoO4)3 up to the melting point at 826 K. The compound shows an SHG signal, I2w/I2w(SiO2)=5 estimated by the powder method. The vibrational properties are evaluated by Raman spectroscopy, and 26 narrow lines are measured.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman, Victoria G., Molokeev M. S., Bazarova, Jibzema G., Bazarov, Bair G., Sorokin, Nikolay, I
Заглавие : Structural, thermal and electrical studies of thallium-scandium-hafnium(zirconium) molybdates
Коллективы : Basic Project of BINM SB RAS [0273-2021-0008]; Government of the Russian Federation [075-15-2019-1886]
Место публикации : J. Solid State Chem. - 2022. - Vol. 307. - Ст.122832. - ISSN 0022-4596, DOI 10.1016/j.jssc.2021.122832. - ISSN 1095-726X(eISSN)
Примечания : Cited References: 56. - The work was supported by Basic Project of BINM SB RAS N degrees 0273-2021-0008. Research was conducted using equipment of the CCU BINM SB RAS. Structural analysis of materials in this study was partly sup-ported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation
Предметные рубрики: POSITIVE ELECTRODE MATERIAL
CRYSTAL-STRUCTURE
IONIC-CONDUCTIVITY
Аннотация: Thallium scandium hafnium molybdate Tl5ScHf(MoO4)6 and thallium scandium zirconium molybdate Tl5ScZr(MoO4)6 crystallize in trigonal symmetry with the space group . The compounds are synthesized by sintering the finely powdered simple molybdates mixture in a muffle furnace at 723–823 K for 100 h. The crystal structures of Tl5ScHf(MoO4)6 and Tl5ScZr(MoO4)6 are obtained by Rietveld method. The following unit cell parameters are calculated for Tl5ScHf(MoO4)6: a = 10.62338 (5), c = 38.0579 (2) Å, V = 3719.64 (4) Å3, Z = 6 and for Tl5ScZr(MoO4)6: a = 10.63216 (7), c = 38.0716 (3) Å, V = 3727.14 (5) Å3, Z = 6. The conductivity of the Tl5ScHf(MoO4)6 and Tl5ScZr(MoO4)6 are measured between 293 and 860 K. The ionic conductivity of Tl5ScHf(MoO4)6 and Tl5ScZr(MoO4)6 molybdates are 8 × 10−4 S/cm and 8 × 10−3 S/cm (at 773 K); the activation energy of ionic transfer are 0.8 eV and 0.3 eV respectively.
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