Phase equilibrium in Bi2O3-ZnO-Nb2O5system
- 1 May 1997
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 195 (1) , 19-22
- https://doi.org/10.1080/00150199708260478
Abstract
The phase equilibrium in Bi2O3-ZnO-Nb2O5 ternary system were investigated. Ceramic samples of compositions (Bi3XZn2-3X(ZnXNb2-X)O7(0.4 < × < 0.67) were prepared by conventional powder processing technique. On the basis of X-ray diffraction (XRD) analysis, the crystal structures were identified as cubic pyrochlore (α) type, monoclinic pyrochlore (β) type and a α-β coexisting phase type, respectively. The α phase forms between 550°C—600°C, while the β phase forms between 650°C—750°C. The stable single α phase can be easily obtained at certain compositions. With the increasing of the calcination temperature, the β phase gradually transforms to the α phaseKeywords
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