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Microstructure, Dielectric, and Piezoelectric Properties of Pb 0.92 Ba 0.08 Nb 2 O 6 –0.25 wt% TiO 2 Ceramics: Effect of Sintering Temperature
Author(s) -
Chen XiaoMing,
Ma HaiYan,
Ding Wei,
Zhang Yu,
Zhao XiaoGang,
Liang Xiao,
Liu Peng
Publication year - 2011
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.1551-2916.2011.04495.x
Subject(s) - curie temperature , materials science , dielectric , sintering , microstructure , orthorhombic crystal system , ceramic , grain size , ferroelectricity , crystallite , piezoelectricity , analytical chemistry (journal) , mineralogy , composite material , crystal structure , crystallography , condensed matter physics , metallurgy , ferromagnetism , chemistry , optoelectronics , physics , chromatography
In order to obtain dense PbNb 2 O 6 ‐based piezoelectric ceramics with a single orthorhombic ferroelectric phase, Ba, and excess Ti were doped into PbNb 2 O 6 ceramics with the composition of Pb 0.92 Ba 0.08 Nb 2 O 6 –0.25 wt% TiO 2 via a conventional solid‐state reaction method. The ceramics were sintered at 1210°–1300°C. The effects of sintering temperature on the crystallite structure, microstructure, and dielectric and piezoelectric properties were studied in detail. All ceramics had shown a high relative density (>94%) and a single orthorhombic phase. The lattice parameters, grain size, and shape varied with changing sintering temperature. All ceramics exhibited a typical characteristic in ferroelectrics with normal paraelectric–ferroelectric phase transition at the Curie temperature. With increasing sintering temperature from 1210° to 1300°C, the Curie temperature decreased from 554° to 523°C, while the maximum dielectric constant increased. The change in dielectric properties with changing sintering temperature is associated with a competing effect among internal stress, porosity, and grain size. The ceramic sintered at 1260°C possesses an excellent piezoelectric constant ( d 33 =82 pC/N), low mechanical quality factor ( Q m =20.52), low dielectric loss (tan δ=0.0062), and high Curie temperature ( T c =535°C), presenting a high potential to be used in high‐temperature applications as piezoelectric transducers.