Locked octahedral tilting in orthorhombic perovskites: At the boundary of the general rule predicting phase transitions

Article

关键词: X-RAY-DIFFRACTION;    CRYSTAL-CHEMISTRY;    YALO3 PEROVSKITE;    SINGLE-CRYSTAL;   

DOI  :  10.1103/PhysRevB.95.024110

来源: SCIE

【 摘 要 】

Mainly ruled by oxygen octahedral rotations, perovskite oxides can exhibit zone boundary transitions (ZBTs) either with dT(c)/dP > 0 or dT(c)/dP < 0. Synchrotron structural investigations at high pressure conditions place YAl0.25Cr0.75O3 orthorhombic perovskite at the boundary of ZBTs. The absence of changes in the octahedral tilting and a volume reduction with pressure exclusively controlled by an isotropic polyhedral compression set YAl0.25Cr0.75O3 as the first finding of a possible asymptote at the Clapeyron relation for predicting ZBTs in perovskites. Furthermore, the discovery of a locked-tilt perovskite can pave the way to a new class of functional materials.

【 授权许可】

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