抄録
Dielectric dispersion of natural smoky quartz was observed in the audio-frequency region at about 400°C. The enthalpy of activation for the dielectric relaxation was about 50 kcal/mole in contrast with a value of about 20 kcal/mole for natural colourless quartz. By thermal bleaching, the enthalpy of activation falls to the value for natural colourless quartz.
Exposed to X-rays, the bleached quartz coloured again and the value of activation enthalpy recovered, and to γ-rays of about 105 to 107r. in total dose, Coloration also attained, but the effect was different from that by X-rays. A linear relation was found between the energies of activation and the logarithms of the total doses of irradiation.
Probable molecular mechanisms responsible to these dielectric phenomena were proposed. The rôle of water molecules trapped in the structure was discussed.
