TIME-RESOLVED POWDER NEUTRON-DIFFRACTION STUDY OF THERMAL-REACTIONS IN CLAY-MINERALS

被引：7

作者：

COLLINS, DR ^{[1
]}

FITCH, AN ^{[1
]}

CATLOW, CRA ^{[1
]}

机构：

[1] UCL ROYAL INST GREAT BRITAIN, DAVY FARADAY RES LAB, LONDON W1X 4BS, ENGLAND

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1991年 / 1卷 / 06期

关键词：

KAOLINITE; VERMICULITE; ETRURIA MARL; TIME-RESOLVED POWDER NEUTRON DIFFRACTION;

D O I：

10.1039/jm9910100965

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermally induced reactions in three contrasting clay samples have been studied, in situ, using time-resolved powder neutron diffraction. The dehydroxylation of kaolinite was observed in the range 440-600-degrees-C, and the initial stages of mullite formation at 950-1000-degrees-C. A multi-component clay material composed of disordered kaolinite and illite, with excess quartz, known as Etruria Marl, dehydroxylated in the range 400-600-degrees-C and began to recrystallize to mullite at 1000-degrees-C. The quartz-cristobalite phase transition in this material was observed at 1150-degrees-C. An Mg-vermiculite was shown to dehydrate in stages, giving stable hydrates with d-spacings of 14.4, 11.7, 10.3 and 9.4 angstrom. The vermiculite dehydroxylated at 400-850-degrees-C and began to recrystallize to enstatite at 1000-degrees-C.

引用

页码：965 / 970

页数：6

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