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Microstructural features and electrical properties of copper oxide added potassium sodium niobate ceramics

Alkoy, Ebru Mensur and Papila, Melih (2010) Microstructural features and electrical properties of copper oxide added potassium sodium niobate ceramics. Ceramics International, 36 (6). pp. 1921-1927. ISSN 0272-8842

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Official URL: http://dx.doi.org/10.1016/j.ceramint.2010.03.018

Abstract

In this study, effects of 0.5, 1.0 and 1.5 mole% CuO addition on the properties of potassium sodium niobate (K0.5Na0.5)NbO3-KNN ceramics were investigated. Pure KNN and CuO-added KNN pellet samples were sintered at 1100 and 1090 degrees C for 4 h, respectively. Phase analysis showed that all samples crystallized in pure orthorhombic perovskite phase. Addition of 1.0 and 1.5 mole% CuO caused grain growth, densification and formation of a liquid phase at the grain boundaries. Curie temperature has shifted from 480 to 435 degrees C with increasing CuO ratio. The most remarkable characteristic of the hysteresis loops were the constricted nature of the 0.5 mole% CuO-added KNN's curve and the antiferroelectric-like appearance of the 1.5 mole% CuO-added KNN's curve. Piezeoelectric properties of d(33) = 120 pC/N, k(p) = 0.27 and Q(m) = 772 were obtained from the 1.5 mole% CuO-added KNN.

Item Type:Article
Uncontrolled Keywords:Powders: solid state reaction; Microstructure-final; Ferroelectric properties; (K,Na)NbO3
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
T Technology > TP Chemical technology > TP0785-869 Clay industries. Ceramics. Glass
ID Code:14206
Deposited By:Melih Papila
Deposited On:13 Aug 2010 09:55
Last Modified:25 May 2011 14:12

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