Crystal structure and high-temperature properties of (Pr,Sr)2(Co,Mn)O4±δ with K2NiF4-type structure
| Autor: | Sergey M. Kazakov, S. Ya. Istomin, Marina G. Rozova, E.V. Zharikova, E.V. Antipov, Nikolay V. Lyskov |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
TEC Analytical chemistry Mineralogy 02 engineering and technology General Chemistry Crystal structure Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Thermal expansion 0104 chemical sciences Electrical resistivity and conductivity Materials Chemistry Titration 0210 nano-technology Oxygen content Powder diffraction |
| Zdroj: | Solid State Communications. 245:31-35 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2016.07.020 |
| Popis: | 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 298–1173 K 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 (298–600 K and 600–1173 K) 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 1173 K in air. |
| Databáze: | OpenAIRE |
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