Abstract
Electrical conductivity of α quartz is ionic, the current being carried by alkali ions (M+) moving in channels parallel to the c axis. A study was made of conductivity σ of one natural and three synthetic crystals in order to better understand these ionic defects. ac measurements were made over a wide range of frequencies, and complex-impedance analysis was used to separate out the bulk conductivity from electrode effects. The activation energy E for the synthetic crystals was always close to 1.36 eV and the pre-exponential A was in the range of 106 K/Ω cm. A decrease in σ resulted from electrodiffusion (sweeping) in hydrogen. For the as-received natural crystal, the value of E was 0.82 eV, but this E value increased appreciably after hydrogen sweeping or after irradiation plus high-temperature anneal. The principal observations could not be interpreted in terms of the conventional theory in which the Al3+-M+ pair and its dissociation products are the only defects involved. A modified theory, in which additional unassociated Al is present as compensation either for H+ or for oxygen vacancies, allows a detailed interpretation of the results. Supporting data are also obtained from infrared measurements.
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Dates
Type | When |
---|---|
Created | 22 years, 6 months ago (Feb. 14, 2003, 6:21 p.m.) |
Deposited | 1 year, 6 months ago (Feb. 4, 2024, 7:17 p.m.) |
Indexed | 8 months ago (Dec. 30, 2024, 1:08 p.m.) |
Issued | 43 years, 8 months ago (Jan. 1, 1982) |
Published | 43 years, 8 months ago (Jan. 1, 1982) |
Published Print | 43 years, 8 months ago (Jan. 1, 1982) |
@article{Jain_1982, title={Electrical conductivity of synthetic and natural quartz crystals}, volume={53}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.329949}, DOI={10.1063/1.329949}, number={1}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Jain, H. and Nowick, A. S.}, year={1982}, month=jan, pages={477–484} }