Influence of water vapor pressure on the induction period during Li2SO4•H2O single crystals dehydration

被引：17

作者：

Favergeon, Loic ^{[1
]}

Pijolat, Michele ^{[1
]}

机构：

[1] Ecole Natl Super Mines, LPMG UMR 5148, Ctr SPIN, F-42023 St Etienne 2, France

来源：

THERMOCHIMICA ACTA | 2011年 / 521卷 / 1-2期

关键词：

Induction period; Nucleation; Water vapor pressure; Lithium sulfate monohydrate; LITHIUM-SULFATE MONOHYDRATE; THERMAL DEHYDRATION; ISOTHERMAL DEHYDRATION; KINETICS; LI2SO4.H2O; DECOMPOSITION; TIME; PENTAHYDRATE; NUCLEATION; MECHANISMS;

D O I：

10.1016/j.tca.2011.04.018

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The dehydration of Li2SO4 center dot H2O single crystals at 80 degrees C has been studied by means of both isothermal thermogravimetry at 2.6, 3.6 and 4.6 hPa of water vapor and environmental scanning electron microscope. Thermogravimetric experiments allowed the determination of induction periods. Distributions of these isoconversion induction periods for a large number of single crystals showed that increasing the water vapor pressure produced a longer induction period. Moreover, the shape of the distributions of the induction periods over a large number of single crystals changed from one mode at 2.6 hPa to two modes at 3.6 and 4.6 hPa. Using an environmental scanning electron microscope, this result could be attributed to differences in nucleation rates at edges and faces of the single crystals. (C) 2011 Published by Elsevier B.V.

引用

页码：155 / 160

页数：6

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