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Heating device for high temperature X-ray powder diffraction studies under controlled water vapour pressure (0–1000 mbar) and gas temperature (20–200 °C)

Published online by Cambridge University Press:  10 January 2013

Martin Oetzel ,
Franz-Dieter Scherberich  and
Gernot Heger
Martin Oetzel
Affiliation:
Institut für Kristallographie, RWTH Aachen, Jägerstrasse 17-19, D-52066 Aachen, Germany
Franz-Dieter Scherberich
Affiliation:
Institut für Kristallographie, RWTH Aachen, Jägerstrasse 17-19, D-52066 Aachen, Germany
Gernot Heger
Affiliation:
Institut für Kristallographie, RWTH Aachen, Jägerstrasse 17-19, D-52066 Aachen, Germany
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Abstract

In this paper we present a high temperature heating device, working under defined environmental conditions, for a Siemens D500 Bragg–Brentano powder diffractometer. The powder sample is prepared in a flat mould on a metal block consisting either of copper or of platinum depending on the temperature range selected for investigations. Although the heating cell can be used separately under ambient conditions up to sample temperatures of 1000 °C, it is possible to work under defined environmental conditions in the temperature range between 20 and 200 °C and up to a water vapour pressure of 1000 mbar. For that purpose a special cover for the in situ control of temperature and water vapour pressure has been constructed. It is important to note that the three sample conditions (sample temperature, gas temperature, and gas humidity) can be adjusted separately by the user. Current studies have shown that the described X-ray heating device is a powerful tool to study dehydration reactions in the frame of fundamental research as well as to understand industrially relevant processes concerning dehydration reactions and their mechanisms.

Keywords

powder diffractionheating cellphase transitionhumiditywater vapourgypsum
Type
Technical Articles
Information
Powder Diffraction , Volume 15 , Issue 1 , March 2000 , pp. 30 - 37
Copyright
Copyright © Cambridge University Press 2000

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