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Low‐Temperature Sintering and Piezoelectric Properties of CuO‐Added 0.95(Na 0.5 K 0.5 )NbO 3 –0.05BaTiO 3 Ceramics
Author(s) -
Park HwiYeol,
Ahn CheolWoo,
Cho KyungHoon,
Nahm Sahn,
Lee HyeungGyu,
Kang HyungWon,
Kim DukHee,
Park KyeongSoon
Publication year - 2007
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.1551-2916.2007.02070.x
Subject(s) - sintering , materials science , poling , piezoelectricity , natural bond orbital , ceramic , grain growth , grain size , abnormal grain growth , mineralogy , analytical chemistry (journal) , phase (matter) , composite material , dielectric , ferroelectricity , chemistry , optoelectronics , density functional theory , computational chemistry , organic chemistry , chromatography
The sintering temperature of 0.95(Na 0.5 K 0.5 )NbO 3 –0.05BaTiO 3 (NKN–BT) ceramics needs to be decreased below 1000°C to prevent Na 2 O evaporation, which can cause difficulties in poling and may eventually degrade their piezoelectric properties. NKN–BT ceramics containing CuO were well sintered at 950°C with grain growth. Poling was easy for all specimens. Densification and grain growth were explained by the formation of a liquid phase. The addition of CuO improved the piezoelectric properties by increasing the grain size and density. High piezoelectric properties of d 33 =230 pC/N, k p =37%, and ɛ 3 T /ɛ 0 =1150 were obtained from the specimen containing 1.0 mol% of CuO synthesized by the conventional solid‐state method.