Premium
Electric‐Field‐Driven Phase Transition Process in (K, Na, Li)(Nb, Ta, Sb)O 3 Lead‐Free Piezoceramics
Author(s) -
Feng Wei,
Du Haiwei,
Chen Chen,
Huang Yanqiu
Publication year - 2016
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.13861
Subject(s) - electric field , phase transition , materials science , poling , orthorhombic crystal system , tetragonal crystal system , piezoelectricity , raman spectroscopy , dielectric , condensed matter physics , permittivity , phase (matter) , analytical chemistry (journal) , ferroelectricity , crystal structure , crystallography , chemistry , composite material , optics , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics
The electric‐field‐driven phase transition in (K, Na, Li)(Nb, Ta, Sb)O 3 lead‐free piezoelectric ceramics was investigated by X‐ray diffraction, Raman spectra, and the temperature dependences of permittivity spectra. After poling under different electric fields, phase of the ceramics transformed gradually from orthorhombic–tetragonal coexisting phase to orthorhombic phase, indicating that the crystal structure of ceramics was strongly sensitive to electric field as an external stimulus. A secondary phase K 3 Li 2 Nb 5 O 15 induced by electric field was detected in the ceramics with Li content of 7 mol%, which was close to the solubility limit of lithium. This field‐induced secondary phase resulted from the movement of Li ions and the structural deformation induced by electric field. Moreover, piezoelectric constant d 33 increased with the increasing poling field strength and the enhancement can be attributed to the field‐triggered domain switching. This study implied that in addition to temperature and composition, which has been reported in previous researches, electric field might be an effective way for inducing phase transition in lead‐free piezoelectric ceramics and improving the electrical performances simultaneously.