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Structural and electric properties of Ce‐doped Na 0.5 Bi 4.5 Ti 4 O 15 piezoceramics with high Curie temperatures
Author(s) -
Qin Lu,
Jiang Chaobin,
Liu Kanghui,
Chen Ye,
Du Yike,
Zuo Yuandong,
Chen Yong,
Cao Wanqiang
Publication year - 2020
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.17089
Subject(s) - curie temperature , materials science , dielectric , analytical chemistry (journal) , ceramic , piezoelectricity , doping , mineralogy , crystal structure , sintering , crystallography , condensed matter physics , composite material , chemistry , optoelectronics , ferromagnetism , physics , chromatography
Na 0.5 Bi 4.5‐ x Ce x Ti 4 O 15 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) lead‐free piezoelectric ceramics with high Curie temperatures are fabricated using the conventional solid‐phase method. The effects of the Ce content on the phase structures, morphologies, and electrical properties of the Na 0.5 Bi 4.5‐ x Ce x Ti 4 O 15 ceramics are systematically investigated. The appropriate content of Ce increases b/a and c/a and induces the distortion of the crystal structure. The increased b/a leads to a transverse asymmetry of the Na 0.5 Bi 4.5‐ x Ce x Ti 4 O 15 ceramics, which facilitates the dipole flipping, thus enhancing the piezoelectric properties ( d 33 = 20 pC/N). Although the improved c/a increases the degree of tetragonality of the Na 0.5 Bi 4.5‐ x Ce x Ti 4 O 15 ceramic, which decreases the Curie temperature ( T C ), the T C values of all samples are higher than 600°C, considerably higher than the practical application temperature. The Ce doping significantly reduces the dielectric loss of the sample and increases its dielectric performance. The improvements in electric properties by the cerium doping can expand its use in high‐temperature environments for oilfield logging, aerospace, and military applications.