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Phase structure, dielectric, and piezoelectric properties of (K 0.94− x Na x Li 0.06 )(Nb 0.94 Sb 0.06 )O 3 lead‐free ceramics
Author(s) -
Fu Lingling,
Lin Dunmin,
Zheng Qiaoji,
Wu Xiaochun,
Xu Chenggang
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228406
Subject(s) - tetragonal crystal system , orthorhombic crystal system , materials science , piezoelectricity , curie temperature , ceramic , dielectric , phase (matter) , perovskite (structure) , analytical chemistry (journal) , phase transition , mineralogy , crystallography , crystal structure , condensed matter physics , composite material , chemistry , optoelectronics , physics , organic chemistry , chromatography , ferromagnetism
Lead‐free piezoelectric ceramics (K 0.94− x Na x Li 0.06 )(Nb 0.94 Sb 0.06 )O 3 have been fabricated by a conventional ceramic technique and the effects of K + /Na + ratio on the structure and piezoelectric properties of the ceramics have been studied. All the ceramics possess a pure perovskite structure. The coexistence of tetragonal and orthorhombic phases is formed at room temperature in the ceramics with 0.45 ≤ x ≤ 0.55. The tetragonal–orthorhombic phase‐transition temperature T O–T decreases from 110 to 54 °C with x increasing from 0.35 to 0.55 and then increases from 84 to 144 °C with x further increasing from 0.6 to 0.7, while the Curie temperature T C deceases from 388 to 348 °C with x increasing from 0.35 to 0.70. Because of the coexistence of the two phases near room temperature, the ceramics with x = 0.50 exhibit the optimum piezoelectric properties: d 33 = 230 pC/N and k p = 49%. The ceramics possess good time stability of piezoelectric properties.