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Soil Science Society of America Journal Abstract -

Measurements of the Standard Entropy of Formation of Clay Minerals1


This article in SSSAJ

  1. Vol. 36 No. 5, p. 835-838
    Received: Dec 30, 1971
    Accepted: May 10, 1972

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  1. Javier M. Santillan-Medrano and
  2. Hinrich L. Bohn2



The standard entropies of several clays were determined by calorimetry. The entropies of kaolinite and halloysite, 0.197 and 0.185 cal/g (50.8 and 47.7 cal/mole), respectively, compared well to literature values. The entropies of 2:1 layer-lattice aluminosilicate clay minerals were within the range of 0.15 to 0.16 cal/g. The results for the 2:1 clays are considered questionable because of the problem of low thermal conductivity of these minerals. Problems of calorimetric measurements of clay minerals are discussed.

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