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Microwave dielectric properties of (1 − x)Cu3Nb2O8−xZn3Nb2O8 ceramics

Published online by Cambridge University Press:  31 January 2011

Dong-Wan Kim ,
In-Tae Kim ,
Byungwoo Park ,
Kug Sun Hong  and
Jong-Hee Kim
Dong-Wan Kim
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul, Korea
In-Tae Kim
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul, Korea
Byungwoo Park
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul, Korea
Kug Sun Hong*
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul, Korea
Jong-Hee Kim
Affiliation:
Materials Research Lab., Samsung Electro-Mechanics Co., Ltd., Suwon, Korea
*
a)Address all correspondence to this author. e-mial: kshongss@plaza.snu.ac.kr
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Abstract

The sintering behavior and microwave dielectric properties of (1 − x)Cu3Nb2O8−xZn3Nb2O8 have been investigated using dilatometry, x-ray diffraction, and a network analyzer. It was found that (1 − x)Cu3Nb2O8−xZn3Nb2O8 ceramics have a much lower melting temperature than Zn3Nb2O8 ceramics without Cu3Nb2O8 additives. Samples sintered at 900 °C for 2 h exhibited densities >97% of the theoretical density. Cu3Nb2O8 acts as a sintering aid. Two phase regions were identified with increasing Zn3Nb2O8 contents. A Cu3Nb2O8−Zn3Nb2O8 solid solution exists from 0 < x < 0.5 while a mixture of Cu3Nb2O8 and Zn3Nb2O8 exists from 0.5 < x < 1. The microwave dielectric properties correlated to the crystal structure. In Cu3Nb2O8−Zn3Nb2O8 solid solution region, the variation of dielectric properties could be explained by the structure distortion of Cu3Nb2O8 due to electronic anisotropies of Cu2+ cations.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1465 - 1470
Copyright
Copyright © Materials Research Society 2001

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