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- Title
A combinatory ferroelectric compound bridging simple ABO3 and A-site-ordered quadruple perovskite.
- Authors
Zhao, Jianfa; Gao, Jiacheng; Li, Wenmin; Qian, Yuting; Shen, Xudong; Wang, Xiao; Shen, Xi; Hu, Zhiwei; Dong, Cheng; Huang, Qingzhen; Cao, Lipeng; Li, Zhi; Zhang, Jun; Ren, Chongwen; Duan, Lei; Liu, Qingqing; Yu, Richeng; Ren, Yang; Weng, Shih-Chang; Lin, Hong-Ji
- 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 type with 8 ligands in PbHg3Ti4O12. Thus PbHg3Ti4O12 appears to be a combinatory link from simple ABO3 perovskites to A-site-ordered AA′3Ti4O12 perovskites, sharing both displacive ferroelectricity with former and structure coordination with latter. This is the only example so far showing ferroelectricity due to symmetry breaking phase transition in AA′3B4O12-type A-site-ordered perovskites, and opens a direction to search for ferroelectric materials. There are few reports of ferroelectricity due to symmetry breaking transition in A-site-ordered quadruple perovskites. Here, the authors find one with phase transition from a high-temperature centrosymmetric paraelectric phase to a low-temperature non-centrosymmetric ferroelectric phase in a high pressure synthesized compound.
- Subjects
PEROVSKITE; FERROELECTRIC materials; COORDINATE covalent bond; SYMMETRY breaking; FERROELECTRICITY; FERROELECTRIC polymers
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-20833-6