Phase transition of Eu 2 Ti 2 O 7  under high pressure and a new ferroelectric phase with perovskite‐like layered structure | Zendy

Gao Zhipeng | Zendy; Liu Yi | Zendy; Lu Chengjia | Zendy; Xia Yuanhua | Zendy; Fang Leiming | Zendy; Ma Yongjun | Zendy; He Qiang | Zendy; He Duanwei | Zendy; Yang Sinuo | Zendy

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Phase transition of Eu 2 Ti 2 O 7 under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Author(s) -

Gao Zhipeng,

Liu Yi,

Lu Chengjia,

Xia Yuanhua,

Fang Leiming,

Ma Yongjun,

He Qiang,

He Duanwei,

Yang Sinuo

Publication year - 2018

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/jace.15418

Subject(s) - pyrochlore , materials science , ferroelectricity , piezoelectricity , perovskite (structure) , phase transition , ceramic , phase (matter) , metastability , crystal structure , sintering , mineralogy , crystallography , condensed matter physics , analytical chemistry (journal) , composite material , dielectric , optoelectronics , chemistry , physics , organic chemistry , chromatography

Ferroelectrics with perovskite‐like layered (PL) structure are well‐known for their high T c and the application prospect of high‐temperature‐piezoelectric sensing. In this study, the PL‐structure Eu 2 Ti 2 O 7 was prepared by 1‐step high‐pressure sintering, which show the pyrochlore structure of Eu 2 Ti 2 O 7 would change into PL structure at 11 GPa, 1300°C. The PL‐structure Eu 2 Ti 2 O 7 is metastable, which will change back to pyrochlore structure at about 900°C in the air. The PL‐structure Eu 2 Ti 2 O 7 was confirmed as a high‐temperature ferroelectric material for the first time. The ferroelectric domain switching was directly observed using piezoelectric force microscope. The piezoelectric constant of the PL Eu 2 Ti 2 O 7 ceramic was measured as 0.7‐0.9 pC/N and its thermal depoling temperature ( T d ) was determined as 800°C, which is associated with the PL‐pyrochlore transition.

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