Chemical potential of water from measurements of optic axial angle of zeolites
Values of the uncorrected optic axial angle (2H α ) of a crystal of the calcium zeolite stellerite (CaAl 2 Si 7 O l8 · 7H 2 0) immersed in calcium chloride solutions of known activity of water (a w ) are directly proportional to log a w . A general relationship between the chemical potential of water in the crystal and the optic axial angle is obeyed.
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