Dielectric Properties of (Bi1.3RE0.2)ZnNb1.5O7 (RE = La, Pr, Nd, Sm, Eu, Y and Er) Ceramics

Author: Xu Q. H.   Yang T. Q.   Qiao H. W.   Shen B.   Ding S. H.   Yao X.  

Publisher: Taylor & Francis Ltd

ISSN: 0015-0193

Source: Ferroelectrics, Vol.356, Iss.1, 2007-01, pp. : 67-71

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Abstract

The dielectric properties of (Bi1.3RE0.2)ZnNb1.5O7 ceramics with different rare earth ion substitution in A site were investigated. All the samples showed a pure cubic pyrochlore structure. With the decrease of the ionic radii of rare earth ion RE3 +, the dielectric loss at room temperature kept the magnitude of 10-4 at 1 MHz, and the dielectric constant was in the range of 108 to 127 which was smaller than that of Bi1.5ZnNb1.5O7. The temperature coefficient of dielectric constant was optimized by RE3+ substitution. In low temperature, all the samples showed the relaxation behavior and had a regular change.