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The electrical conductivity of calcium fluoride crystals grown by the Stockbarger and the Czochralski techniques has been measured in the temperature range 20-260°C. Additional heat treatments in air and in argon indicate that the much higher conductivity of the pulled crystals can be explained in terms of the thermal stresses and higher oxygen content introduced in the growth process. Absorption spectra measurements support this view.
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Julie Champion (1965) studied this question.
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