Structure and cation distribution in perovskites with small cations at the A site: the case of ScCoO3

Science and Technology of Advanced Materials

Alexey V Sobolev¹  Yana S Glazkova¹  Igor A Presniakov¹  Kosuke Kosuda²  Yoshihiro Tsujimoto³  Wei Yi⁴  Alexei A Belik⁴  Kazunari Yamaura⁵  Yoshitaka Matsushita⁶  Masahiko Tanaka⁶ 

[1] Lomonosov Moscow State University;Materials Analysis Station, NIMS;Materials Processing Unit, NIMS;National Institute for Materials Science (NIMS);Superconducting Properties Unit, NIMS;Synchrotron X-ray Station at SPring-8, NIMS;

关键词: perovskites;    cobaltites;    high-pressure;    low-spin co3+ ions;   

DOI  :  10.1088/1468-6996/16/2/024801

来源: DOAJ

【 摘 要 】

We synthesize ScCoO3 perovskite and its solid solutions, ScCo1−xFexO3 and ScCo1−xCrxO3, under high pressure (6 GPa) and high temperature (1570 K) conditions. We find noticeable shifts from the stoichiometric compositions, expressed as (Sc1−xMx)MO3 with x = 0.05–0.11 and M = Co, (Co, Fe) and (Co, Cr). The crystal structure of (Sc0.95Co0.05)CoO3 is refined using synchrotron x-ray powder diffraction data: space group Pnma (No. 62), Z = 4 and lattice parameters a = 5.26766(1) Å, b = 7.14027(2) Å and c = 4.92231(1) Å. (Sc0.95Co0.05)CoO3 crystallizes in the GdFeO3-type structure similar to other members of the perovskite cobaltite family, ACoO3 (A3+ = Y and Pr-Lu). There is evidence that (Sc0.95Co0.05)CoO3 has non-magnetic low-spin Co3+ ions at the B site and paramagnetic high-spin Co3+ ions at the A site. In the iron-doped samples (Sc1−xMx)MO3 with M = (Co, Fe), Fe3+ ions have a strong preference to occupy the A site of such perovskites at small doping levels.

【 授权许可】

Unknown