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Microstructure and Piezoelectric Properties of 0.95(Na 0.5 K 0.5 )NbO 3 –0.05SrTiO 3 Ceramics
Author(s) -
Cho KyungHoon,
Park HwiYeol,
Ahn CheolWoo,
Nahm Sahn,
Uchino Kenji,
Park SeungHo,
Lee HyeungGyu,
Lee HwackJoo
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.1551-2916.2007.01715.x
Subject(s) - natural bond orbital , piezoelectricity , microstructure , materials science , ceramic , grain size , mineralogy , porosity , composite material , analytical chemistry (journal) , density functional theory , chemistry , computational chemistry , chromatography
The 0.95(Na 0.5 K 0.5 )NbO 3 –0.05SrTiO 3 (0.95NKN–0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na 2 O was intentionally subtracted from the 0.95NKN–0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na 2 O‐subtracted 0.95NKN–0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na 0.49 K 0.5 )NbO 2.995 –0.05ST ceramics showed high piezoelectric properties of d 33 =220, k p =0.4, Q m =72, and ɛ 3 T /ɛ o =1447, thereby demonstrating their promising potential as a candidate material for application to lead‐free piezoelectric ceramics.