Journal
INORGANIC CHEMISTRY
Volume 50, Issue 22, Pages 11787-11794Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic201901a
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22245009]
- Global COE program International Center Science, Kyoto University, Japan
- Priority Program for Disaster-Affected Quantum Beam Facilities [2010G560, 2011A1944]
- Foundation Hattori-Hokokai
- MEXT [S0901022]
- [19052004]
- Grants-in-Aid for Scientific Research [22540489, 19052004, 10J00584, 19052007, 22245009] Funding Source: KAKEN
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The rock salt (B1) structure of binary oxides or chalcogenides transforms to the CsCl (B2) structure under high pressure, with critical pressures P(s) depending on the cation to anion size ratio (R(c)/R(a)). We investigated structural changes of A(2)MO(3) (A = Sr, Ca; M = Cu, Pd) comprising alternate 7-fold B1 AO blocks and corner-shared MO(2) square-planar chains under pressure. All of the examined compounds exhibit a structural transition at P(s) = 29-41 GPa involving a change in the A-site geometry to an 8-fold B2 coordination. This observation demonstrates, together with the high pressure study on the structurally related Sr(3)Fe(2)O(5), that the B1-to-B2 transition generally occurs in these intergrowth structures. An empirical relation of P(s) and the R(c)/R(a) ratio for the binary system holds well for the intergrowth structure also, which means that P(s) is predominantly determined by the rock salt blocks. However, a large deviation from the relation is found in LaSrNiO(3.4), where oxygen atoms partially occupy the apical site of the MO(4) square plane. We predict furthermore the occurrence of the same structural transition for Ruddlesden-Popper-type layered perovskite oxides (AO)(AMO(3))(n), under higher pressures. For investigating the effect on the physical properties, an electrical resistivity of Sr(2)CuO(3) is studied.
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