INFLUENCE OF VAPOUR PRESSURE ON FORMATION OF ANGYDROUS ZIRCONIUM SULPHATES

被引:9
作者
BEAR, IJ
机构
[1] Division of Mineral Chemistry, CSIRO Chemical Research Laboratories, Port Melbourne, VIC, 3207
关键词
D O I
10.1071/CH9690875
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The anhydrous products resulting from the dehydration of Zr(SO4)2,4H2O in external atmospheres of controlled H2SO4 and SO3 partial pressures consist of three polymorphs, two of which, γ- and β-Zr(SO4)2, are metastable and equilibrate to the stable phase, α-Zr(SO4)2. The rates of decomposition of these anhydrous sulphates to cubic ZrO2 have been measured and activation energies for the processes calculated. From these data the vapour pressure-temperature diagram for the anhydrous region of the ZrO2-SO3-H2O system has been delineated. This shows the existence range of γ-Zr-(SO4)2 lies within that of β-Zr(SO4)2 while both lie within that of the stable α-phase. The function of physical factors, such as particle and sample size and heating technique, in controlling phase formation during dehydration in air is interpreted in terms of the vapour pressure-temperature diagram. © 1969, CSIRO. All rights reserved.
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页码:875 / &
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