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Application of inert radioactive gases in the study of solids

Part 1 Classical emanation method and surface labelling method. Apparatus and comparison of methods in the study of ferric oxide and thorium oxalate

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Abstract

Two methods based on the release of inert radioactive gases were used to study processes taking place on heating of solids: the classical emanation method and the surface labelling method. The results obtained with the use of these methods are compared for the study of (a) substances which do not change chemically when being heated in the temperature range studied (e.g. α-Fe2O3), (b) substances in which dehydration and thermal decomposition takes place (e.g. Th(C2O4).6H2O).

For substances which exhibit chemical and structural changes when being heated, results of investigation by means of the two above mentioned radiochemical methods are compared with DTA and dilatometric data, obtained under identical experimental conditions. Apparatus permitting simultaneous measurement of the release of two radioactive gases, DTA and dilatometric measurement is described.

From the substances which do not change when being heated, values of the activation energy of diffusion of inert gases incorporated by different ways are discussed. The advantages of the emanation and surface labelling methods over other physico-chemical methods are given and the possibilities of their application for the study of processes taking place in solids on heating, are described.

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Authors and Affiliations

  1. Department of Radiochemistry, Charles University, Prague, Czechoslovakia

    V. Balek

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  1. V. Balek
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Additional information

The experimental part of this study was carried out during the author's stay at the Radiochemistry Dept, Moscow State University.

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Balek, V. Application of inert radioactive gases in the study of solids. J Mater Sci 4, 919–927 (1969). https://doi.org/10.1007/BF00549784

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