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Microstructure and Piezoelectric Properties of (1− x )(Na 0.5 K 0.5 )NbO 3 – x LiNbO 3 Ceramics
Author(s) -
Song HyunCheol,
Cho KyungHoon,
Park HwiYeol,
Ahn CheolWoo,
Nahm Sahn,
Uchino Kenji,
Park SeungHo,
Lee HyeungGyu
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.1551-2916.2007.01698.x
Subject(s) - sintering , materials science , microstructure , piezoelectricity , ceramic , mineralogy , grain size , phase boundary , relative density , natural bond orbital , analytical chemistry (journal) , phase (matter) , grain boundary , composite material , chemistry , density functional theory , computational chemistry , organic chemistry , chromatography
(1− x )(Na 0.5 K 0.5 )NbO 3 – x LiNbO 3 [(1− x )NKN– x LN] ceramics were produced by the conventional solid‐state sintering method, and their microstructure and piezoelectric properties were investigated. The formation of the liquid phase and K 6 Li 4 Nb 10 O 30 second phase that were observed in the (1− x )NKN– x LN ceramics was explained by the evaporation of Na 2 O during the sintering. A morphotropic phase boundary (MPB) was observed in the specimens with 0.05< x <0.08. Promising piezoelectric properties were obtained for the specimens with x =0.07. Therefore, the piezoelectric properties of this 0.93NKN–0.07LN ceramic were further investigated and were found to be influenced by their relative density and grain size. In particular, grain size considerably affected the d 33 value. Two‐step sintering was conducted at different temperatures to increase the grain size. Piezoelectric properties of d 33 =240 (pC/N) and k p =0.35 were obtained for the 0.93NKN–0.07LN ceramics sintered at 1030°C and subsequently annealed at 1050°C.