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

E. V. Zharikova, M. G. Rozova, S. M. Kazakov, S. Ya Istomin, N. V. Lyskov, E. V. Antipov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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 K1 to 26.7 ppm K1. 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.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalSolid State Communications
Volume245
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Keywords

  • Crystal structure
  • Electrical conductivity
  • Oxides
  • Thermal expansion

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