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Phase Relations and Microwave Dielectric Properties of ZnNb2O6–TiO2

Published online by Cambridge University Press:  31 January 2011

Dong-Wan Kim ,
Deok-Yang Kim  and
Kug Sun Hong
Dong-Wan Kim
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
Deok-Yang Kim
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
Kug Sun Hong*
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
*
a)Address all correspondence to this author.
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Abstract

The phase relations and microwave dielectric properties of (1−x)ZnNb2O6–xTiO2 were investigated using x-ray powder diffraction and a network analyzer. Four phase regions were studied with increasing TiO2 mol% (x): columbite solid solution, ixiolite (ZnTiNb2O8) solid solution, mixture of ixiolite and rutile solid solutions, and rutile solid solution. It was suggested that the microwave properties depend on crystal structure rather than chemical composition. In the columbite solid solution region, an order–disorder transition was found with an increasing amount of TiO2, and the quality factor decreased sharply. ZnTiNb2O8 (x = 0.5), has a fully disordered structure and possesses a quality factor of 42,500, relative dielectric constant (εr) of 34.3, and temperature coefficient of resonant frequency (τf) of −52 ppm/°C. In the mixture region of ixiolite and rutile structure, τf was modified to around 0 ppm/°C.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 6 , June 2000 , pp. 1331 - 1335
Copyright
Copyright © Materials Research Society 2000

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