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A high-quality polycrystalline sample of the correlated 4d post-perovskite CaRhO(3) (Rh(4+): 4d(5), S(el) = 1/2) was attained under a moderate pressure of 6 GPa. Since the post-perovskite is quenchable at ambient pressure/temperature, it can be a valuable analogue of the post-perovskite MgSiO(3) (stable higher than 120 GPa and unstable at ambient pressure), which is a significant key material in earth science. The sample was subjected for measurements of charge-transport and magnetic properties. The data clearly indicate it goes into an antiferromagnetically ordered state below approximately 90 K in an unusual way, in striking contrast to what was observed for the perovskite phase. The post-perovskite CaRhO(3) offers future opportunities for correlated electrons science as well as earth science.

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New perovskite-type oxyfluoride, PbMnO2F was synthesized under 4–7 GPa at 1000 °C. As a result of X-ray and electron diffractions, the compound was determined to have tetragonal perovskite structure with a × a × 4c super structure where a and c are the lattice parameters of the perovskite subcell. The tetragonality, c/a, attained maximum, c/a = 1.100, for PbMnO2F synthesized under 4 GPa.