Publication Date:
2014-09-23
Description:
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.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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