Irradiation Effects and Short-Range Order in Fused Silica and Quartz

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Abstract
The eigenvalues of the g tensor of an irradiation produced defect of the quartz structure have been found to be g1 = 2.0003, g2 = 2.0006, g3 = 2.0018. The data on the center are consistent with the assignment of S = ½. Assuming that the hyperfine interaction with Si29 (I = ½ and 4.7% abundant) is negligible, the envelope of the line is calculated for 4 widths of the line. Good agreement is found between the calculated envelope for a width of 0.2 oe and the envelope observed in γ-ray and in neutron-irradiated (≤1018 fast neutrons/cm2) silica. The observed envelope deviates from the calculated envelope for increasing neutron irradiation. It is suggested that a correlation of the Si-O tetrahedra, similar to α-quartz, exists around any point in the more common forms of silicas and has a diameter of ≥5 A.

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