Crystal structure and high-temperature properties of (Pr,Sr)2(Co,Mn)O4±d with K2NiF4-type structure

Zharikova, E.V.; Rozova, M.G.; Kazakoa, S.M.; Istomin, S.Y.; Lyskov, N.V.; Antipov, E.V.

Авторы: Zharikova E.V., Rozova M.G., Kazakoa S.M., Istomin S.Ya, Lyskov N.V., Antipov E.V.
Журнал: Solid State Communications
Том: 245
Год издания: 2016
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 31
Последняя страница: 35
DOI: 10.1016/j.ssc.2016.07.020
Аннотация: Novel oxides PrSrCo1-yMnyO4±δ, 0.0 ≤ y ≤ 0.5 and Pr0.5Sr1.5Co1-yMnyO4±δ 0.3 ≤ y ≤ 0.5 with K2NiF4-type structure were synthesized. The crystal structure, oxygen content, thermal expansion and electrical conductivity of the obtained compounds were examined. A chemical titration showed that PrSrCo0.5Mn0.5O4±δ is slightly overstoichiometric (δ=0.03(2)), while Pr0.5Sr1.5Co0.5Mn0.5O4±δ is oxygen deficient (δ=-0.05(2)). Thermal expansion behavior was studied by both dilatometry and high-temperature X-ray powder diffraction in the temperature range of 298-1173K in air. Pr0.5Sr1.5Co0.5Mn0.5O3.95(2) exhibited linear thermal expansion along the a- and c-axes over the studied temperature range with thermal expansion coefficients (TECs) were 17.5 ppm K-1 and 17.8 ppm K-1, respectively. For PrSrCo0.5Mn0.5O4.03(2) two regions (298-600K and 600-1173K) observed, where the TEC along the a-axis decreased from 12.7 ppm K-1 to 10.4 ppm K-1 whereas the TEC along the c-axis increased from 14.5 ppm K-1 to 26.7 ppm K-1. Both compounds demonstrated lower in comparison with undoped PrSrCoO4 values of electrical conductivity of 7 S/cm for PrSrCo0.5Mn0.5O4.03(2) and 23 S/cm for Pr0.5Sr1.5Co0.5Mn0.5O3.95(2) at 1173K in air.
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Crystal structure and high-temperature properties of (Pr,Sr)2(Co,Mn)O4±d with K2NiF4-type structureстатья

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