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Measurements of the Standard Entropy of Formation of Clay Minerals¹

ABSTRACT

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.

¹ Contribution from the Dep. of Agr. Chemistry and Soils, Univ. of Arizona, Tucson 85721. Taken from an M.S. thesis submitted to the Graduate College.

² Graduate Student, present address: Dep. of Soils and Meteorology, Utah State Univ., Logan, and Associate Professor, respectively.

Received for publication December 30, 1971. Accepted for publication May 10, 1972.