The magnetic susceptibility of potassium chloride crystals additively colored with an excess of potassium was measured from 1^∘{}K to 300^∘{}K. The excess magnetic susceptibility or the susceptibility of the color centers can be described by a temperature independent term which is predominant at room temperatures plus a temperature dependent term which obeys Curie's law and predominates in the liquid helium temperature range. It is suggested that the portion of the susceptibility following Curie's law is due to F-centers, and the temperature-independent contribution is due to color center complexes.
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Heer et al. (1953) studied this question.
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