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Bi2O3 Solubility of Bi-based Pyrochlores and Related Phases

Published online by Cambridge University Press:  31 January 2011

Juan C. Nino ,
Hyuk J. Youn ,
Michael T. Lanagan  and
Clive A. Randall
Juan C. Nino*
Affiliation:
Center for Dielectric Studies, Materials Research Laboratory Building—MRI, Pennsylvania State University, University Park, Pennsylvania 16802
Hyuk J. Youn
Affiliation:
Center for Dielectric Studies, Materials Research Laboratory Building—MRI, Pennsylvania State University, University Park, Pennsylvania 16802
Michael T. Lanagan
Affiliation:
Center for Dielectric Studies, Materials Research Laboratory Building—MRI, Pennsylvania State University, University Park, Pennsylvania 16802
Clive A. Randall
Affiliation:
Center for Dielectric Studies, Materials Research Laboratory Building—MRI, Pennsylvania State University, University Park, Pennsylvania 16802
*
a)Address all correspondence to this author. A2 Materials Research Laboratory Building, The Pennsylvania State University, University Park, Pennsylvania 16802. e-mail: jcn125@psu.edu
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Extract

Bismuth oxide solubility in Bi2O3–ZnO–Nb2O5 and Bi2O3–MgO–Nb2O5 (BMN) pyrochlore systems was investigated and the solubility limits were identified. Differences in the solubility behavior between the two Bi-pyrochlore systems investigated were analyzed and explained through crystal chemistry concepts. For the BMN system, the dielectric constant was enhanced, and a systematic shift occurred in the dielectric relaxation loss peak to higher temperatures with increases in the excess bismuth are reported in the BMN system. The relationship between solubility and the shift in the dielectric loss curve was analyzed under the scope of possible relaxation mechanisms.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1178 - 1182
Copyright
Copyright © Materials Research Society 2002

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