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Effect of Sintering Temperature on Microstructure and Electric Properties of 0.95(K 0.5 Na 0.5 )NbO 3 –0.05Li(Nb 0.5 Sb 0.5 )O 3 with Copper Oxide Sintering Aid
Author(s) -
Zhao Yongjie,
Zhao Yuzhen,
Huang Rongxia,
Liu Rongzheng,
Zhou Heping
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.1551-2916.2010.04353.x
Subject(s) - natural bond orbital , materials science , sintering , microstructure , dielectric , piezoelectricity , grain size , analytical chemistry (journal) , ceramic , relative density , mineralogy , metallurgy , composite material , chemistry , density functional theory , computational chemistry , optoelectronics , chromatography
The 0.95(K 0.5 Na 0.5 NbO 3 )–0.05Li(Nb 0.5 Sb 0.5 )O 3 doped with 0.8 mol% copper oxide (CuO) lead‐free piezoelectric ceramics were synthesized by conventional solid‐state reaction route. The introduction of CuO could significantly improve the sinterability of 0.95(K 0.5 Na 0.5 NbO 3 )–0.05Li(Nb 0.5 Sb 0.5 )O 3 ceramics. The grain size of the specimen was considerably decreased due to the formation of a large amount of liquid phase when the sintering temperature exceeded 960°C. The piezoelectric constant ( d 33 ), planar electromechanical coupling ( k p ), and dielectric constant () values increased with increasing relative density and grain size. The improved piezoelectric and dielectric properties of d 33 =207 pC/N, k p =44%, tan δ=0.0137, Q m =320, and=340 can be obtained for specimens sintered at 960°C for 2 h.