Study of natural and ion exchanged vermiculite by emanation thermal analysis, TG, DTA and XRD

被引：61
作者：
Pérez-Maqueda, LA
Balek, V [1 ]
Poyato, J
Pérez-Rodriquez, JL
Subrt, J
Bountsewa, IM
Beckman, IN
Málek, Z
机构：
[1] Nucl Res Inst, CZ-25068 Rez, Czech Republic
[2] Univ Sevilla, CSIC, Inst Ciencia Mat, Seville 41092, Spain
[3] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic
[4] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 199234, Russia
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2003年 / 71卷 / 03期
关键词：
emanation thermal analysis; DTA; ion exchange; microstructure; TG; venniculite; XRD;
D O I：
10.1023/A:1023353521235
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Emanation thermal analysis (ETA), thermogravimetry, DTA and XRD were used in thermal characterization of natural vermiculite (Santa Olalla, Huelva, Spain) and of Na+- and NH4+- exchanged vermiculite samples during heating in air in the range 25-1100degreesC. A good agreement between the results of these methods was found. Changes in the radon release rate measured by ETA, which reflected the decrease and collapse of the interlayer space after the release of water as well as the formation of new crystalline phases were evaluated using a mathematical model. The model used for the evaluation was found suitable for the quantitative characterization of microstructure changes during in situ conditions of heating of vermiculite samples.
引用
收藏
页码：715 / 726
页数：12
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