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    Thallium ionic conductivity of new thallium indium hafnium molybdate ceramics / V. G. Grossman, J. G. Bazarova, M. S. Molokeev, B. G. Bazarov // Ionics. - 2020. - Vol. 26. - P. 6157-6165, DOI 10.1007/s11581-020-03739-7. - Cited References: 60. - This study was carried out within the state assignment of FASO of Russia (Theme No 0339-2016-0007) as well was supported by RFBR Grants 18-08-00799 and 18-03-00557 . - ISSN 0947-7047. - ISSN 1862-0760
   Перевод заглавия: Таллий-ионная проводимость новой керамики на основе таллия, индия, гафния, молибдата

РУБ Chemistry, Physical + Electrochemistry + Physics, Condensed Matter
Рубрики:
POSITIVE ELECTRODE MATERIAL
CRYSTAL-STRUCTURE
TRIPLE MOLYBDATE
Кл.слова (ненормированные):
Synthesis -- Thallium -- Molybdates -- Phase diagram -- DSC -- Conducting material
Аннотация: In the process of studying the system Tl2MoO4–In2(MoO4)3–Hf(MoO4)2, a new thallium indium hafnium molybdate was found. The crystal structure of the molybdate Tl5InHf(MoO4)6 was determined in the centrosymmetric space group R3¯c (a = 10.63893 (5) Å, c = 38.1447(3) Å; V = 3739.04 (4) Å3, Z = 6). The structure is a three-dimensional framework consisting of alternating (Hf,In)O6-octahedra connected by МоО4-tetrahedra. Each octahedron has common vertices with tetrahedra. The atoms arranged in this way form channels extended along with the a and b axes, in which thallium atoms are located. The conductivity behavior of Tl5InHf(MoO4)6 ceramics was studied in the temperature range from 300 to 870 K. The conductivity of the heavy cations of thallium is activated with increasing temperature.

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Держатели документа:
Russian Acad Sci, Baikal Inst Nat Management, Siberian Branch, Sakhyanovoy St 6, Ulan Ude 670047, Buryat Republic, Russia.
Russian Acad Sci, Fed Res Ctr KSC, Kirensky Inst Phys, Siberian Branch, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 82 Svobodniy Av, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Grossman, Victoria G.; Bazarova, J. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarov, B. G.; RFBRRussian Foundation for Basic Research (RFBR) [0339-2016-0007]; [18-08-00799]; [18-03-00557]
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    New triple molybdate K5ScHf(MoO4)6: Synthesis, properties, structure and phase equilibria in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems / V. G. Grossman, J. G. Bazarova, M. S. Molokeev, B. G. Bazarov // J. Solid State Chem. - 2020. - Vol. 283. - Ст. 121143, DOI 10.1016/j.jssc.2019.121143. - Cited References: 53. - This study was carried out within the state assignment of FASO of Russia (Theme No 0339-2016-0007) as well was supported by RFBR Grants 18-08-00799 and 18-03-00557 . - ISSN 0022-4596
   Перевод заглавия: Новый тройной молибдат K5ScHf(MoO4)6: синтез, свойства, структура и фазовые равновесия в системах M2MoO4-Sc2(MoO4)3-Hf(MoO4)2 (M = Li, K)
Кл.слова (ненормированные):
Synthesis -- Molybdates -- X-ray diffraction -- DSC -- Electric properties
Аннотация: Subsolidus phase relations in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems have been studied by the method of “intersecting cuts”. No new triple molybdates have been identified in the Li2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system and a new triple molybdate K5ScHf(MoO4)6 is formed in the K2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system. The structure of K5ScHf(MoO4)6, have been determined in space group Rc through Rietveld analysis of X-ray powder diffraction data. The melting point of molybdate is 999 K. The compound has high ion conductivity (about 10−3 S cm−1).

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Держатели документа:
Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakhyanovoy St., 6, Ulan-Ude, Buryat Republic 670047, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, RAS, 50 / 38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 82 Svobodniy Av., Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Grossman, V. G.; Bazarova, J. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarov, B. G.
}
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    Exploration of structural, vibrational and spectroscopic properties of self-activated orthorhombic double molybdate RbEu(MoO4)2 with isolated MoO4 units / V. V. Atuchin, A. S. Aleksandrovsky, B. G. Bazarov [et al.] // J. Alloy. Compd. - 2019. - Vol. 785. - P. 692-697, DOI 10.1016/j.jallcom.2019.01.013. - Cited References: 42. - The reported study was funded by RFBR according to research projects 16-52-48010, 17-52-53031 and 18-03-00557. Besides, this study was supported by the Ministry of Science and Higher Education of the Russian Federation (project 0339-2016-0007). The work was supported by Act 211 Government of the Russian Federation, contract No 02.A03.21.0011. Additionally, the work was partially supported by the Ministry of Education and Science of the Russian Federation (4.1346.2017/4.6). . - ISSN 0925-8388. - ISSN 1873-4669
   Перевод заглавия: Исследование структурных, колебательных и спектроскопических свойств самоактивированного орторомбического двойного молибдата RbEu(MoO4)2 с изолированными группами MoO4

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
MORPHOLOGY-CONTROLLED SYNTHESIS
LUMINESCENCE PROPERTIES
Кл.слова (ненормированные):
Rubidium europium molybdate -- Solid state reaction -- Rietveld refinement -- DSC -- Raman luminescence
Аннотация: RbEu(MoO4)2 is synthesized by the two-step solid state reaction method. The crystal structure of RbEu(MoO4)2 is defined by Rietveld analysis in space group Pbcn with cell parameters a = 5.13502(5), b = 18.8581(2) and c = 8.12849(7) Å, V = 787.13(1) Å3, Z = 4 (RB = 0.86%). This molybdate possesses its phase transition at 817 K and melts at 1250 K. The Raman spectra were measured with the excitation at λ = 1064 and 514.5 nm. The photoluminescence spectrum is evaluated under the excitation at 514.5 nm. The absolute domination of hypersensitive 5D0→7F2 transition is observed. The ultranarrow 5D0→7F0 transition in RbEu(MoO4)2 is positioned at 580.2 nm being 0.2 nm blue shifted, with respect to that in Eu2(MoO4)3.

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Держатели документа:
SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk, Russia.
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia.
South Ural State Univ, Lab Single Crystal Growth, Chelyabinsk 454080, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
SB RAS, Kirensky Inst Phys, Lab Coherent Opt, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia.
SB RAS, Baikal Inst Nat Management, Lab Oxide Syst, Ulan Ude 670047, Russia.
Buryat State Univ, Ulan Ude 670000, Russia.
Ind Univ Tyumen, Dept Gen & Special Chem, Tyumen 625000, Russia.
SB RAS, Inst Semicond Phys, Lab Nanodiagnost & Nanolithog, Novosibirsk 630090, Russia.
SB RAS, Kirensky Inst Phys Fed Res Ctr KSC, Lab Mol Spect, Krasnoyarsk 660036, Russia.
SB RAS, Inst Inorgan Chem, Lab Funct Films & Coatings, Novosibirsk 630090, Russia.
SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660079, Russia.
SB RAS, Inst Automat & Elect, Lab Condensed Matter Spect, Novosibirsk 630090, Russia.

Доп.точки доступа:
Atuchin, V. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Bazarov, B. G.; Bazarova, J. G.; Chimitova, Olga D.; Denisenko, Yuriy G.; Gavrilova, T. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Maximovskiy, Eugene A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Pugachev, Alexey M.; Surovtsev, Nikolay V.; RFBR [16-52-48010, 17-52-53031, 18-03-00557]; Ministry of Science and Higher Education of the Russian Federation [0339-2016-0007]; Act 211 Government of the Russian Federation [02.A03.21.0011]; Ministry of Education and Science of the Russian Federation [4.1346.2017/4.6]
}
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Tetragonal to cubic transition of Sr0.8Dy0.2CoO3-δ and oxygen mobility: TG-DSC-XRD study / S. Vereshchagin, V. Dudnikov, Y. Orlov, L. Solovyov // J. Alloys Compd. - 2021. - Vol. 860. - Ст. 158257, DOI 10.1016/j.jallcom.2020.158257. - Cited References: 35. - This work was conducted within the framework of the budget project (Project No. АААА-А17-117021310222-4) for Institute of Chemistry and Chemical Technology SB RAS using the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS and in part was funded by Russian Foundation for Basic Research (projects 19-03-00017), RFBR and BRFBR (project 18-52-00017), Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project 18-42-243004) . - ISSN 0925-8388
Кл.слова (ненормированные):
Ceramics -- Perovskite -- Phase transitions -- Oxygen mobility -- Thermal analysis -- X-ray diffraction
Аннотация: Processes of ordering (d-o) and disordering (o-d) of Sr2+/Dy3+ cations in a single-phase Sr0.8Dy0.2CoO3-δ was investigated by TG-DSC and XRD as a function of heating/cooling rate (β = 2,10,20,50,99 K min−1 and ~50 K/s) in 20% O2-Ar flow. According to DSC data the interconversion of disordered cubic (c) and ordered tetragonal (t) structure appears at 1276–1328 K as a first-order phase transition; the temperature and enthalpy of o-d transformation have only slight dependence on β whereas the characteristics of reversed d-o process vary greatly with cooling rate. XRD powder patterns of all samples showed no indications of a simultaneous presence of c+t domains, pointing to a single phase composition (c or t). It was suggested that the observed behavior is a consequence of two simultaneous interconnected processes of A-sublattice melting and cation/ (anion vacancy) ordering. A rarely used novel TG-DSC method based on variable gas phase composition was utilized to study properties of mobile oxygen over Sr0.8Dy0.2CoO3-δ samples. It was shown that the appearance of tetragonal phase reduces both oxygen mobility and its bonding energy, the latter decreasing substantially only at high degree of Sr2+/Dy3+ ordering.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch”, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch”, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Vereshchagin, S.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L.
}
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    Solid-state reaction in Cu/a-Si nanolayers: A comparative study of STA and electron diffraction data / E. T. Moiseenko, V. V. Yumashev, R. R. Altunin [и др.] // Materials. - 2022. - Vol. 15, Is. 23. - Ст. 8457, DOI 10.3390/ma15238457. - Cited References: 45. - This work was supported by the Russian Science Foundation under grant # 22-13-00313 . - ISSN 1996-1944
   Перевод заглавия: Твердофазная реакция в нанослоях Cu/a-Si: сравнительное исследование данных, полученных методами СТА и дифракции электронов
Кл.слова (ненормированные):
copper silicide -- thin films -- nanolayer -- solid-state reaction -- phase formation -- kinetics -- activation energy -- enthalpy -- DSC -- electron diffraction
Аннотация: The kinetics of the solid-state reaction between nanolayers of polycrystalline copper and amorphous silicon (a-Si) has been studied in a Cu/a-Si thin-film system by the methods of electron diffraction and simultaneous thermal analysis (STA), including the methods of differential scanning calorimetry (DSC) and thermogravimetry (TG). It has been established that, in the solid-state reaction, two phases are formed in a sequence: Cu + Si → η″-Cu3Si → γ-Cu5Si. It has been shown that the estimated values of the kinetic parameters of the formation processes for the phases η″-Cu3Si and γ-Cu5Si, obtained using electron diffraction, are in good agreement with those obtained by DSC. The formation enthalpy of the phases η″-Cu3Si and γ-Cu5Si has been estimated to be: ΔHη″-Cu3Si = −12.4 ± 0.2 kJ/mol; ΔHγ-Cu5Si = −8.4 ± 0.4 kJ/mol. As a result of the model description of the thermo-analytical data, it has been found that the process of solid-state transformations in the Cu/a-Si thin-film system under study is best described by a four-stage kinetic model R3 → R3 → (Cn-X) → (Cn-X). The kinetic parameters of formation of the η″-Cu3Si phase are the following: Ea = 199.9 kJ/mol, log(A, s−1) = 20.5, n = 1.7; and for the γ-Cu5Si phase: Ea = 149.7 kJ/mol, log(A, s−1) = 10.4, n = 1.3, with the kinetic parameters of formation of the γ-Cu5Si phase being determined for the first time.

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Держатели документа:
Laboratory of Electron Microscopy, Siberian Federal University, 79 Svobodny Ave., 660041 Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Moiseenko, E. T.; Yumashev, V. V.; Altunin, R. R.; Zeer, G. M.; Nikolaeva, N. S.; Belousov, O. V.; Zharkov, S. M.; Жарков, Сергей Михайлович
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    High ionic conductivity of K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) solid solutions / V. G. Grossman, M. S. Molokeev, J. G. Bazarova, B. G. Bazarov // Solid State Sci. - 2022. - Vol. 134. - Ст. 107027, DOI 10.1016/j.solidstatesciences.2022.107027. - Cited References: 39. - The work was supported by Basic Project of BINM SB RAS №0273-2021-0008. Structural analysis of materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation . X-ray powder diffraction and thermal analysis were obtained using the equipment of the Collective Use Center BINM SB RAS . - ISSN 1293-2558
   Перевод заглавия: Высокая ионная проводимость твердых растворов K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5)
Кл.слова (ненормированные):
Synthesis -- Thallium -- Potassium -- Molybdates -- DSC -- Conducting material
Аннотация: Novel K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) oxides were successfully synthesized by solid state reaction. The results indicate the formation of a continuous series of solid solutions with the NASICON-like structure (sp. gr. R3¯c) in the composition range 0 < x < 5. The unit-cell parameters of the solid solutions increase linearly with composition, as a consequence of thallium substitution for potassium. The cation conductivity of Tl5Mg0.5Hf1.5(MoO4)6 has been shown to exceed the conductivity of the parent potassium magnesium hafnium molybdate. The highest total conductivity of 2.49 × 10−3 S/cm was found at 831 K for Tl5Mg0.5Hf1.5(MoO4)6.

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Держатели документа:
Baikal Institute of Nature Management, SB RAS, Sakhyanovoy St., 6, Ulan-Ude, 670047, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Academy of Sciences, 50 / 38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 82 Svobodniy Av., Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Serysheva str. 47, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Grossman, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarova, J. G.; Bazarov, B. G.
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    Potassium and thallium conductors with a trigonal structure in the M2MoO4–Cr2(MoO4)3–Hf(MoO4)2 (M = K, Tl) systems: Synthesis, structure, and ionic conductivity / V. G. Grossman, M. S. Molokeev, B. G. Bazarov, J. G. Bazarova // J. Alloys Compd. - 2021. - Vol. 873. - Ст. 159828, DOI 10.1016/j.jallcom.2021.159828. - Cited References: 62. - The work was supported by Basic Project of BINM SB RAS № 0273-2021-0008 . Research was conducted using equipment of the CCU BINM SB RAS (Ulan-Ude, Russia). Structural analysis of materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation . - ISSN 0925-8388
   Перевод заглавия: Калиевые и таллиевые проводники с тригональной структурой в системах M2MoO4-Cr2(MoO4)3–Hf(MoO4)2 (M = K, Tl): синтез, структура и ионная проводимость
Кл.слова (ненормированные):
Synthesis -- Thallium -- Potassium -- Molybdates -- Phase diagram -- DSC -- Conducting material
Аннотация: The triple molybdates M5CrHf(MoO4)6 (M = K, Tl) and TlCrHf0.5(MoO4)3 were found upon studying the corresponding ternary molybdate systems M2MoO4–Cr2(MoO4)3–Hf(MoO4)2 (M = K, Tl) in the subsolidus region using X-ray powder diffraction. The crystal structures of M5CrHf(MoO4)6 (M = K, Tl) and TlCrHf0.5(MoO4)3 are refined by Rietveld method. M5CrHf(MoO4)6 (M = K, Tl) crystallizes in space group Rc with unit cell parameters: a = b = 10.45548 (5), c = 37.24614 (3) Å, V = 3526.14 (4) Å3, Z = 6 for K5CrHf(MoO4)6 and a = b = 10.53406 (12), c = 37.6837 (5) Å, V = 3621.39 (9) Å3, Z = 6 for Tl5CrHf(MoO4)6. TlCrHf0.5(MoO4)3 crystallizes in space group R with unit cell parameters: a = b = 12.9710 (2), c = 11.7825 (2) Å, V = 1716.78 (6) Å3, Z = 6. The thermal stability and electrical conductivity of the new compounds were investigated. Electrical conductivity measurements gave high values for the triple molybdates M5CrHf(MoO4)6 (M = K, Tl) (σ = 5.22 × 10−4 S / cm for K5CrHf(MoO4)6, σ = 1.1 × 10−2 S / cm for Tl5CrHf(MoO4)6 at 773 K) and relatively low values for the triple molybdate TlCrHf0.5(MoO4)3 (σ = 4.42 × 10−6 S / cm at 773 K).

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Держатели документа:
Baikal Institute of Nature Management, SB RAS, Sakhyanovoy St., 6, Ulan-Ude, 670047, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Academy of Sciences, 50/38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 82 Svobodniy Av., Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Serysheva str. 47, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Grossman, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarov, B. G.; Bazarova, J. G.
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    Верещагин, Сергей Николаевич.
    Применение ТГ/ДСК-анализа c программированным составом газовой фазы для изучения фазового перехода порядок-беспорядок в нестехиометрическом Sr-Dy-кобальтате / С. Н. Верещагин, В. А. Дудников, Ю. С. Орлов // J. Sib. Fed. Univ. Chem. - 2018. - Vol. 11, Is. 4. - P. 507-517 ; Журн. СФУ. Химия, DOI 10.17516/1998-2836-0095. - Библиогр.: 17. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда науки в рамках научного проекта No 18-42-243004 и проекта фундаментальных исследований СО РАН V.45.3.3. . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: Application of TG/DSC analysis under variable gas phase composition to study order-disorder transition in nonstoichiometric Sr-Dy-cobaltate

РУБ Chemistry, Multidisciplinary
Рубрики:
PEROVSKITE
OXYGEN
Кл.слова (ненормированные):
перовскит -- порядок-беспорядок -- фазовый переход -- ТГ -- ДСК -- perovskite -- order-disorder -- phase transition -- TG -- DSC
Аннотация: Методом термического анализа (ТГ/ДСК) в условиях постоянного и программированного состава газовой фазы изучено влияние скорости закалки на полноту перехода кубического разупорядоченного нестехиометрического перовскита (I) Sr(0.8)Dy(0.2)CoO(3-d) в тетрагональную модификацию (II) с упорядоченным расположением катионов Sr/Dy и анионных вакансий, а также взаимосвязь степени превращения I в II с количеством мобильного кислорода и его энергетическими характеристиками. Показано, что фазовое превращение протекает как фазовый переход первого рода, процесс образования структуры II контролируется кинетическими факторами, а использование скоростей охлаждения 3-99 К/мин позволяет получить образцы, формально соответствующие 98-30 % превращению I в II; при этом как количество подвижного кислорода, так и энтальпия его удаления из образца нелинейно зависят от полноты перехода I в II.
For the first time a method of TG/DSC analysis under constant and variable gas phase composition was applied to reveal interconnection between quenching ramp rates and degree of phase transformation of cubic nonstoichiometric disordered perovskite (I) Sr(0.8)Dy(0.2)CoO(3-d) to tetragonal structure (II) with ordered Sr/Dy cations and anion vacancies. It was shown that the transformation is a first order phase transition and the ordering process is kinetically controlled. Based on the experimental transition enthalpy it was found that a formal conversion degree of I to II was 98-30% under cooling ramp rates 3-99 K/min. Non-linear relationship between the completeness of I-to-II transformation and mobile oxygen characteristics (content and the enthalpy of O-removal) was demonstrated.

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SB RAS, FRC Krasnoyarsk Sci Ctr, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia.
SB RAS, FRC Krasnoyarsk Sci Ctr, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Дудников, Вячеслав Анатольевич; Dudnikov, V. A.; Орлов, Юрий Сергеевич; Orlov, Yu. S.; Vereshchagin S. N.

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Phase transformation behavior of Sr0.8Gd0.2CoO3−δ perovskite in the vicinity of order-disorder transition / S. N. Vereshchagin [et al.] // Thermochim. Acta. - 2017. - Vol. 655. - P. 34-41, DOI 10.1016/j.tca.2017.06.003. - Cited References: 41. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project #16-43-240505 p_a and #16-02-00507A. . - ISSN 0040-6031
Кл.слова (ненормированные):
DSC -- Order-disorder -- Perovskite -- Phase transition -- Ruddlesden-Popper phase
Аннотация: The phase transformation behavior of a single-phase tetragonal Sr0.8Gd0.2CoO3-δ (with ordered distribution of Sr2+/Gd3+ cations and anion vacancies) was investigated by TG–DSC and XRD at 1100–1473 K and oxygen partial pressure p(O2) from 1 to 5·104 Pa. The first-order smeared order-disorder (o-d) phase transition involving heat absorption was observed at about 1383 K under O2-Ar flow with p(O2) > 2.5 kPa. The crystal structure of the high-temperature phase was found to be cubic perovskite with disordered Sr2+/Gd3+ cations and anion vacancies. The temperature of o-d transition at p(O2) > 2.5 kPa was not influenced by the heating rate or oxygen partial pressure. It was shown that at p(O2) < 2.5 kPa the o-d transition gives rise to Sr0.8Gd0.2CoO3−δ decomposition to form CoO and Sr2.4Gd0.6Co2O7-δ − Ruddlesden-Popper type phase with novel composition. The phase boundaries between the ordered tetragonal Sr0.8Gd0.2CoO3−δ, disordered cubic Sr0.8Gd0.2CoO3−δ and CoO + Sr2.4Gd0.6Co2O7-δ composite as a function of temperature and p(O2) values were determined.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Vereshchagin, S. N.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Shishkina, N. N.; Solovyov, L. A.
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10.

    Exploration of structural, thermal, vibrational and spectroscopic properties of new noncentrosymmetric double borate Rb3NdB6O12 / V. V. Atuchin [et al.] // Adv. Powder Technol. - 2017. - Vol. 28, Is. 5. - P. 1309-1315, DOI 10.1016/j.apt.2017.02.019. - Cited References: 42. - We are grateful to Guochun Zhang for the crystal structure data on K3YB6O12, and O. Tsydenova and A. Sarapulova for her consultations. This research was supported by SB RAS Program No.II.2P (No. 0356-2015-0412) and RSF (14-22-0143). The reported study was funded by RFBR according to the research projects 15-02-04950 and 15-52-53080, 16-32-00351, 16-52-48010 and 17-52-53031. Also, the work was supported by Act 211 Government of the Russian Federation, contract 02.A03.21.0011 and by the Ministry of Education and Science of the Russian Federation (4.1346.2017/PP). . - ISSN 0921-8831
   Перевод заглавия: Изучение структурных, тепловых, колебательных и спектроскопических свойств нового нецентросимметричного кристалла двойного бората Rb3NdB6O12
Кл.слова (ненормированные):
Rubidium neodymium borate -- Solid state reaction -- Rietveld refinement -- DSC -- Raman scattering
Аннотация: New noncentrosymmetric rare earth borate Rb3NdB6O12 is found in the ternary system Rb2O–Nd2O3–B2O3. The Rb3NdB6O12 powder was fabricated by solid state synthesis at 1050 K for 72 h and the crystal structure was obtained by the Rietveld method. Rb3NdB6O12 crystallized in space group R32 with unit cell parameters a = 13.5236(4), c = 31.162(1) Å, Z = 3. From DSC measurements, the reversible phase transition (I type) in Rb3NdB6O12 is observed at 852–936 K. The 200 μm thick tablet is transparent over the spectral range of 0.3–6.5 μm and the band gap is found as Eg ∼ 6.29 eV. Nonlinear optical response of Rb3NdB6O12 tested via SHG is estimated to be higher than that of K3YB6O12. Blue shift of Nd luminescent lines is found in comparison with other borates. The vibrational parameters of Rb3NdB6O12 are evaluated by experimental methods.

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Держатели документа:
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation
Institute of Chemistry, Tyumen State University, Tyumen, Russian Federation
Laboratory of Single Crystal Growth, South Ural State University, Chelyabinsk, Russian Federation
Laboratory of Oxide Systems, Baikal Institute of Nature Management, SB RAS, Ulan-Ude, Russian Federation
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation
Laboratory of Nanodiagnostics and Nanolithography, Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russian Federation
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Department of Photonics and Laser Technologies, Siberian Federal University, Krasnoyarsk, Russian Federation
Laboratory of Condensed Matter Spectroscopy, Institute of Automation and Electrometry, SB RAS, Novosibirsk, Russian Federation
Laboratory of High Pressure Minerals and Diamond Deposits, Institute of Geology and Mineralogy, SB RAS, Novosibirsk, Russian Federation

Доп.точки доступа:
Atuchin, V. V.; Subanakov, A. K.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Bazarov, B. G.; Bazarova, J. G.; Dorzhieva, S. G.; Gavrilova, T. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Pugachev, A. M.; Tushinova, Y. L.; Yelisseyev, A. P.
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