Phase equilibria investigations and thermodynamic modeling of the system Bi2O3-Al2O3

被引：11

作者：

Oudich, F. ^{[1
]}

David, N. ^{[1
]}

Mathieu, S. ^{[2
]}

Vilasi, M. ^{[1
]}

机构：

[1] Univ Lorraine, CNRS, UMR 7198, Inst Jean Lamour Equipe Surface & Interface React, F-54506 Vandoeuvre Les Nancy, France

[2] Univ Lorraine, Serv Commun Microscopies Elect & Microanal X, F-54506 Vandoeuvre Les Nancy, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 457卷

关键词：

ELECTRICAL-PROPERTIES; X-RAY; BISMUTH; BI2AL4O9; AL; MULLITE; OXIDES; REASSESSMENT; CONDUCTIVITY; DIFFRACTION;

D O I：

10.1016/j.jnucmat.2014.10.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The system Bi2O3-Al2O3 has been experimentally investigated above 600 degrees C by DTA, XRD and EPMA under air and low oxygen pressure. Only two compounds were found to exist in equilibrium, which are Bi2Al4O9(1Bi(2)O(3): 2Al(2)O(3)) and Bi25AlO39(25:1). The latter exhibits a sillenite structure and does not contain pentavalent bismuth. A peritectoid decomposition of (25:1) and a peritectic melting of (1:2) occur at 775 degrees C and 1075 degrees C respectively, while an eutectic transformation was observed at 815 degrees C for 97 mol% Bi2O3. On the basis of the results obtained within the present work as well as experimental data provided from literature, a thermodynamic modeling where the liquid phase is described by the two-sublattice ionic liquid model was performed according to the Calphad approach. The resulting thermodynamic optimization yielded good agreement with experimental results in the investigated region. (C) 2014 Elsevier B. V. All rights reserved.

引用

页码：72 / 79

页数：8

共 56 条

[1] Structure and oxide ion conductivity mechanism in Bi2Al4O9 by combined X-ray and high-resolution neutron powder diffraction and 27Al solid state NMR [J].