抄録
Compounds with the postperovskite (PPv)-type crystal structure were searched using a Kawai-type multi-anvil high-pressure apparatus. We succeeded in synthesizing PPv-type CaRuO3, CaRhO3, NaNiF3, NaCoF3, and NaZnF3 and found that perovskite (Pv)-type NaMnF3 decomposes into two phases above about 10 GPa instead of phase transition to a PPv phase. The PPv-type CaRuO3, CaRhO3 and NaNiF3 are quenchable without partial back-transformation to the Pv-type structure. The structure refinements of the synthesized compounds suggest that PPv-type NaNiF3 and NaZnF3 are preferable to the other PPv-type compounds as analogue materials of PPv-type MgSiO3 which is accepted as a major constituent mineral in the Earth's lowermost mantle.
