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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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Thermodynamic properties of rare-earth cobalt oxides and solid solutions La1–xGdxCoO3 / Yu. S. Orlov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P3.13. - P. 196. - This work has been supported by the RAS program, the state task 0358-2015-0006, RFBR Grant no. 16-02-00507 and Scholarship of the President of the Russian . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
rare-earth cobalt oxides -- solid solutions -- dilatation -- spin crossover

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gorev, M. V.; Горев, Михаил Васильевич; Vereshchagin, S. N.; Верещагин, С. Н.; Solovyov, L. A.; Соловьев, Леонид Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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Structural, magnetic, electronic, and dilatation properties of the ordered solid solutions Ln0.2Sr0.8CoO3-δ (Ln = Sm, Gd, Dy) with the same oxygen nonstoichiometry index δ / V. A. Dudnikov, Y. S. Orlov, M. V. Bushinsky [et al.] // J. Alloy. Compd. - 2020. - Vol. 830. - Ст. 154629, DOI 10.1016/j.jallcom.2020.154629. - Cited References: 44. - The work was financially supported by Russian Foundation for Basic Research (grant No. 19-03-00017); RFBR and BRFFR as a part of scientific project No. 18-52-00017 and project F18R-119; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: "New thermoelectric materials based on multi-scale spatially inhomogeneous substituted rare-earth cobalt oxides and the Ruddlesden-Popper phases " project No. 18-42-243004, Project of Basic Research SB RAS V.45.3.3. . - ISSN 0925-8388. - ISSN 1873-4669

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
LN(1-X)SR(X)COO(3-DELTA) LN
COBALTATE PEROVSKITES
Кл.слова (ненормированные):
Rare earth cobalt oxide solid solutions -- Layered perovskite-type cobalt oxides -- Structural -- Magnetic -- Electronic -- Dilatation properties
Аннотация: Single-phase samples of the layered perovskite-like cobalt oxides Ln0.2Sr0.8CoO3-δ (Ln = Sm, Gd, Dy) with the same oxygen nonstoichiometry index δ = 0.37 ± 0.01 were synthesized. All samples are characterized by a tetragonal unit cell with the space group I4/mmm. The structural, magnetic, electric transport and dilatation properties of the obtained samples are investigated. The studied samples are characterized by two anomalies in magnetic properties, a high-temperature maximum near Тm = 350 К with magnetic field hysteresis below Tm, and a diffuse peak in the intermediate temperature range, which shifts with ionic radius decrease of the rare-earth element to higher temperatures. The high-temperature maxima of the magnetic susceptibility correlate with anomalies in thermal expansion, heat capacity and the features in the temperature dependences of the electrical resistivity, pointing to a strong relationship between the structural, magnetic and electronic degrees of freedom. The given comparative analysis of the experimental data of various substituting rare-earth elements with the same oxygen nonstoichiometry has been carried out for the first time.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
RAS, Fed Res Ctr KSC SB, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Lebedev Phys Inst, Moscow 119991, Russia.
NAS Belarus, Sci Pract Mat Res Ctr, Minsk 220072, BELARUS.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia.

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Bushinsky, M. V.; Solovyov, L. A.; Vereshchagin, S. N.; Gavrilkin, S. Yu; Tsvetkov, A. Yu; Gorev, M. V.; Горев, Михаил Васильевич; Novikov, S. V.; Mantytskaya, O. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-03-00017]; RFBRRussian Foundation for Basic Research (RFBR) [18-52-00017, F18R-119]; BRFFR [18-52-00017, F18R-119]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory [18-42-243004, SB RAS V.45.3.3]
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Effect of multiplicity fluctuation in cobalt ions on crystal structure, magnetic and electrical properties of NdCoO3 and SmCoO3 / V. A. Dudnikov, Y. S. Orlov, L. A. Solovyov [et al.] // Molecules. - 2020. - Vol. 25, Is. 6. - Ст. 1301, DOI 10.3390/molecules25061301. - Cited References: 56. - This work is supported by the Russian Science Foundation grant 18-02-00022. . - ISSN 1420-3049

РУБ Biochemistry & Molecular Biology + Chemistry, Multidisciplinary
Рубрики:
SPIN-STATE TRANSITIONS
   CO3+ ION
   CONDUCTIVITY
   TEMPERATURE
   BEHAVIOR
Кл.слова (ненормированные):
rare-earth cobalt oxides -- multiplicity fluctuations -- structural -- magnetic -- electrical -- and dilatation properties
Аннотация: The structural, magnetic, electrical, and dilatation properties of the rare-earth NdCoO3 and SmCoO3 cobaltites were investigated. Their comparative analysis was carried out and the effect of multiplicity fluctuations on physical properties of the studied cobaltites was considered. Correlations between the spin state change of cobalt ions and the temperature dependence anomalies of the lattice parameters, magnetic susceptibility, volume thermal expansion coefficient, and electrical resistance have been revealed. A comparison of the results with well-studied GdCoO3 allows one to single out both the general tendencies inherent in all rare-earth cobaltites taking into account the lanthanide contraction and peculiar properties of the samples containing Nd and Sm.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr KSC, SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
RAS, Fed Res Ctr KSC, Inst Chem & Chem Technol, SB, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia.
Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia.

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, Leonid A.; Vereshchagin, Sergey N.; Gavrilkin, Sergey Yu.; Tsvetkov, Alexey Yu.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Gorev, M. V.; Горев, Михаил Васильевич; Novikov, Sergey V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Science FoundationRussian Science Foundation (RSF) [18-02-00022]
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