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Effects of La on Dielectric and Piezoelectric Properties of Pb 1−x La 2x/3 (Nb 0.95 Ti 0.0625 ) 2 O 6 Ceramics
Author(s) -
Men Gaoli,
Liu Peng,
Zhang Ruoxi,
Chen Hong,
Wang Bo,
Zhou Jianping,
Zhu Gangqiang
Publication year - 2009
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/j.1551-2916.2009.03117.x
Subject(s) - materials science , dielectric , curie temperature , orthorhombic crystal system , ceramic , piezoelectricity , tetragonal crystal system , analytical chemistry (journal) , dielectric loss , doping , ferroelectricity , mineralogy , phase (matter) , ferroelectric ceramics , crystallography , crystal structure , condensed matter physics , composite material , chemistry , optoelectronics , ferromagnetism , physics , organic chemistry , chromatography
Ceramics with the chemical compositions of Pb 1− x La 2 x /3 (Nb 0.95 Ti 0.0625 ) 2 O 6 (0≤ x ≤0.060) (PLTN) were prepared by the conventional solid‐state reaction method. X‐ray diffraction analysis indicated that Ti and La doping not only decreased the rhombohedral–tetragonal phase transformation temperature, but also stabilized the orthorhombic phase of PLTN ceramics. All ceramics sintered at 1190°–1250°C had shown the pure orthorhombic ferroelectric phase. La doping suppresses grain growth and inhibits the formation of pores and cracks, resulting in an increase in relative density up to 97%. The amount of La doping to PLTN ceramics obviously affect ceramics' piezoelectric constant ( d 33 ) and dielectric loss (tanδ). The sample with x =0.015 possesses high Curie temperature ( T c =560°C), low dielectric loss (tanδ=0.0054), and excellent piezoelectric constant ( d 33 =92 pC/N), presenting a high potential to be used in high‐temperature applications as piezoelectric transducers.