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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.