Mainly ruled by oxygen octahedral rotations, perovskite oxides can exhibit zone boundary transitions (ZBTs) either with dTc/dP>0 or dTc/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.

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

ARDIT, Matteo
Primo
;
CRUCIANI, Giuseppe
Ultimo
2017

Abstract

Mainly ruled by oxygen octahedral rotations, perovskite oxides can exhibit zone boundary transitions (ZBTs) either with dTc/dP>0 or dTc/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.
Ardit, Matteo; Dondi, M.; Cruciani, Giuseppe
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2371125
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