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Low‐Temperature Sintering and Piezoelectric Properties of CuO ‐Added KNbO 3 Ceramics
Author(s) -
Kim DaeHyeon,
Joung MiRi,
Seo InTae,
Hur Joon,
Kim JongHyun,
Kim BoYun,
Lee HwackJoo,
Nahm Sahn
Publication year - 2014
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/jace.13225
Subject(s) - sintering , materials science , piezoelectricity , ceramic , dielectric , relative density , ion , phase (matter) , analytical chemistry (journal) , mineralogy , microstructure , composite material , chemistry , chromatography , organic chemistry , optoelectronics
Dielectric and piezoelectric properties of CuO ‐added KNbO 3 ( KN ) ceramics were investigated. The CuO reacted with the Nb 2 O 5 , formed a CuO – Nb 2 O 5 ‐related liquid phase during the sintering, and assisted the densification of the KN ceramics at low temperatures. Moreover, some of the Cu 2+ ions replaced the Nb 5+ ions in the matrix and behaved as a hardener. The dielectric and piezoelectric properties of the KN ceramics were considerably influenced by the relative density. The 1.0 mol% CuO ‐added KN ceramic sintered at 960°C for 1.0 h, which showed a maximum relative density, exhibited a high phase angle of 86.9°, P r of 14.8 μC/cm 2 , and E c of 1.8 kV/mm. This specimen also exhibited good dielectric and piezoelectric properties: ε T 33 / ε o of 364, d 33 of 122 pC/N, k p of 0.29, and Q m of 611.