INVESTIGATION OF SOLID-STATE REACTIONS AND SOLID-SOLID PHASE-TRANSFORMATIONS WITH TIME-RESOLVED AND TEMPERATURE-RESOLVED X-RAY-POWDER DIFFRACTOMETRY

被引：20

作者：

EPPLE, M ^{[1
]}

CAMMENGA, HK ^{[1
]}

机构：

[1] TECH UNIV BRAUNSCHWEIG,INST PHYS & THEORET CHEM,W-3300 BRAUNSCHWEIG,GERMANY

来源：

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1992年 / 96卷 / 11期

关键词：

CHEMICAL KINETICS; CRYSTALS; PHASE TRANSITIONS; SOLID STATE REACTIONS; X-RAY DIFFRACTION;

D O I：

10.1002/bbpc.19920961150

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：

An X-ray powder diffractometer has been equipped with a heatable sample holder which allows highly defined heating up to 250-degrees-C. A good temperature control permits isothermal as well as non-isothermal runs. The applicability of time- and temperature-resolved X-ray powder diffractometry (TXRD) as a thermoanalytical method is demonstrated. Solid state reactions and solid-solid phase transformations were investigated. As examples the phase transformation of phenanthrene and the dehydration of caffeine hydrate are presented. It is possible to extract the activation parameters for a solid state reaction from a single non-isothermal run with a constant heating rate. The principles of the quantitative kinetic evaluation of time- and temperature-resolved X-ray powder diffraction data are outlined.

引用

页码：1774 / 1778

页数：5

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