A combinatory ferroelectric compound bridging simple ABO₃ and A-site-ordered quadruple perovskite.

ABSTRACT: The simple ABO₃ and A-site-ordered AA'₃B₄O₁₂ perovskites represent two types of classical perovskite functional materials. There are well-known simple perovskites with ferroelectric properties, while there is still no report of ferroelectricity due to symmetry breaking transition in A-site-ordered quadruple perovskites. Here we report the high pressure synthesis of an A-site-ordered perovskite PbHg₃Ti₄O₁₂, the only known quadruple perovskite that transforms from high-temperature centrosymmetric paraelectric phase to low-temperature non-centrosymmetric ferroelectric phase. The coordination chemistry of Hg²⁺ is changed from square planar as in typical A-site-ordered quadruple perovskite to a rare stereo t

SUBMITTER: Zhao J 

PROVIDER: S-EPMC7854592 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature