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Fabrication and Dielectric Properties of Phase-Pure Ba2Ti9O20 Microwave Resonators

Published online by Cambridge University Press:  15 February 2011

Wen-Yi Lin
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, Georgia 30332
Rosario A. Gerhardt
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, Georgia 30332
Robert F. Speyer
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, Georgia 30332
Wesley S. Hackenberger
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Thomas R. Shrout
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The thermal processing schedules necessary to form phase pure Ba2TigO20, with and without substitutional solid solution were investigated. Undoped compositions formed the compound most easily under rapid (500°C/min) heating rates, where diffusional agglomeration of the. TiO2 batch constituent was minimized. The compound formed most easily with minor (0.82%) substitutions of SnO2 and ZrO2 for TiO2. The solubility of Sn in Ba2Ti9O20 was higher than that of Zr. Extended heat treatment (16 vs. 6 h at 1390°C) resulted in volitalization of grain boundary liquid phase, leading to a more porous and slightly degraded resonators. The effects of dopant concentrations and soak periods at 1390°C on dielectric constants and temperature-dependent quality factors are reported.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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References

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