Thermodynamic study of the rich-Bi<sub>2</sub>O<sub>3</sub> region of the Bi<sub>2</sub>O<sub>3</sub>-ZnO system

Precise knowledge of the Bi2O3-ZnO system is fundamental to control the functional microstructure of ZnO-based varistors. Also the potential applications of materials based on ZnO and Bi2O3 as dielectric materials in the high frequency range have renewed the interest in this binary system. The aim o...

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Bibliographic Details
Main Authors: de la Rubia, M. A., Serena, S., Caballero, A. C., Caballero, A.
Format: Article
Language:English
Published: Elsevier 2006-06-01
Series:Boletín de la Sociedad Española de Cerámica y Vidrio
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Online Access:http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/295/314
Description
Summary:Precise knowledge of the Bi2O3-ZnO system is fundamental to control the functional microstructure of ZnO-based varistors. Also the potential applications of materials based on ZnO and Bi2O3 as dielectric materials in the high frequency range have renewed the interest in this binary system. The aim of the present work is to carry out a thermodynamic analysis of the Bi2O3-ZnO phase diagram, taking into account the existing experimental information. Thermodynamic calculation has been performed according CALPHAD methodology (CALculation of PHAse Diagrams), using the software Thermo-Calc.<br><br>El conocimiento preciso del sistema Bi2O3-ZnO es una herramienta básica para conseguir el control de la microestructura de los varistores basados en ZnO. Recientemente otros materiales basados en óxidos de cinc y bismuto han mostrado un gran potencial para su uso en aplicaciones como dieléctricos a frecuencias altas, renovando el interés por dicho sistema binario. El objetivo del presente trabajo es realizar una evaluación termodinámica del diagrama de fases consistente para el sistema Bi2O3-ZnO teniendo en cuenta la información experimental existente del mismo. La evaluación termodinámica del sistema se ha llevado a cabo mediante la metodología CALPHAD (CALculation of PHAse Diagrams), empleando el software Thermo- Calc.
ISSN:0366-3175