Mechanoradicals of quartz produced by grinding were studied by use of an electron spin resonance (ESR) measurement. Quartz was ground by a vibrating ball mill in a nitrogen atmosphere, and the specific surface area was measured by the BET adsorption method. The ESR measurements were carried out on an X-band apparatus at room temperature. As a result of grinding, the shape of the observed ESR spectra became complicated with the passage of grinding time, and the ESR signal intensity likewise increased. From the obtained g-values of the ESR spectra the mechanoradicals of quartz produced by grinding were estimated to be E' center, non-bridging oxygen hole center and peroxy radical. It was found that the mechanoradical concentration was approximately proportional to the produced specific surface area.
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Hasegawa et al. (1993) studied this question.