Ceramics-Silikáty 18, (4) 295 - 311 (1974)

A method was worked out for determining the increased energy content supplied to quartz by grinding, by measuring the exothermic effect in DTA. Measurements performed after certain selected times of grinding show that liberation of energy starts within the temperature interval of 110°C ± 10 °C and exhibits several peaks. The first peak, arising in particular with quartz after short times of grinding, appears at 325 ± 15 °C and tends to shift towards lower temperature within this range with increasing time of grinding. The second peak lies at 420 ± 20 °C, while the third one at 540 ± 10 °C, being overlapped by the second one when the time of grinding increases. The paper also shows the effect of surface active substances on the growth of internal energy of quartz in the course of grinding, and brings evidence on an increase in internal energy due to the grinding of "amorphous" substances such as quartz glass. The results were employed in the formulation of certain conclusions with respect to the mechanism of grinding.