Temperature dependence and hyperfine structure of Fe3+centres in synthetic quartz

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Abstract
The temperature dependence of spin Hamiltonian parameters of Fe3+ centres in synthetic quartz has been investigated with an X-band EPR spectrometer. The fine-structure parameters D and E of Fe3+ centres are found to be linearly increasing with decreasing temperature from 300 K to 90 K. The variations of D are in the descending order of S'1, S"1 and S1 centres, but the changes of E are in the reverse sequence. The hyperfine structure of these centres reveals that the nuclear spin of compensating ions for S1, S'1, and S"1 is 3/2, 1/2 and 3/2, respectively. By comparing these centres with the established Al centres, it is tentatively proposed that S1, S'1 and S"1 centres are compensated with Na+, H+, and Li+, respectively.