Phase Equilibria in the Fe2O3-P2O5 System

被引：36

作者：

Zhang, Liying ^{[1
]}

Schlesinger, Mark E. ^{[1
]}

Brow, Richard K. ^{[1
]}

机构：

[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2011年 / 94卷 / 05期

基金：

美国国家科学基金会;

关键词：

IRON PHOSPHATE-GLASSES; STRUCTURAL FEATURES; IMMOBILIZATION; CATALYST;

D O I：

10.1111/j.1551-2916.2010.04287.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Four ferric phosphate compounds were identified in the Fe2O3-P2O5 system and the liquidus surfaces in the subsystems Fe3PO7-FePO4, FePO4-Fe-4(P2O7)(3), and Fe-4(P2O7)(3)-Fe(PO3)(3) were determined. The results are significantly different from those presented by Wentrup in 1935. Fe3PO7 is the stable ferric oxo-phosphate compound, not Fe4P2O11, and Fe3PO7 decomposes in air at 1090 degrees C. The congruent melting point of FePO4 (1208 degrees C) is similar to what was reported, but Fe-4(P2O7)(3) melts congruently at 945 degrees C, about 300 degrees C lower than claimed by Wentrup. Fe(PO3)(3), for which the melting temperature has not been previously reported, melts congruently at 1205 degrees C. Eutectic points exist at 58.0 mol% Fe2O3 (1070 degrees C), 42.7% Fe2O3 (925 degrees C), and 37.0% Fe2O3 (907 degrees C). The latter two eutectic points bracket the conventional glass-forming range for iron phosphate melts under consideration as alternative hosts for nuclear wastes.

引用

页码：1605 / 1610

页数：6

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