Die Böhmit-Entwässerung, verfolgt mit einer neuen Röntgenheizkamera*

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Abstract
An x-ray camera of the Guinier-Seemann-Bohlin-type with a heating stage is described. By means of this, changes in the diffraction patterns resulting from thermal expansion, phase transformations or chemical changes as a function of temperature can be recorded continuously. The maximum temperature which can be attained is 1200°C. The camera has been used to investigate the dehydration of the well-crystallized boehmite ( γ AlOOH) which looses water at approximately 480°C to form tetragonal δ Al 2 O 3 . The lattice constants of the latter change continuously and irreversibly with temperature. The transformation to θ Al 2 O 3 and α corundum begins at approximately 1000°C.

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