Abstract
It is known that anion impurities can depress the extrinsic conductivity of alkali halide crystals. In particular, oxygen impurities have been found to be very effective in reducing the extrinsic conductivity of sodium chloride crystals. Experimental evidence suggests that this effect is due to the formation of calcium-oxygen complexes which prevent the calcium impurities from producing the lattice vacancies normally responsible for the extrinsic conductivity. Since the impurity complexes give rise to absorption bands in the infrared region of the spectrum, this provides an additional technique for studying their behaviour.
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