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Dielectric Loss in Li- and Na-Swept α-Quartz and the Effect of Irradiation

Published online by Cambridge University Press:  21 February 2011

J. Toulouse  and
A.S. Nowick
J. Toulouse
Affiliation:
Henry Krumb School of Mines, Columbia University, New York, New York 10027
A.S. Nowick
Affiliation:
Henry Krumb School of Mines, Columbia University, New York, New York 10027
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Abstract

Alkali ions, which compensate for substitional Al3+, play an important role in the frequency stability of α-quartz crystals. In this work, low temperature dielectricloss measurements (between 2.9 and 300 K) are carried out on crystals that have been “swept” so as to introduce either Li+ or Na+. High quality synthetic crystals as well as natural crystals are employed. The well known loss peaks due to Al-Na pairs are further explored and similar peaks due to Al-Li are sought after but not found. It is concluded that the Al-Li pair is oriented along the C2 -axis of the A104 distorted tetrahedron. After irradiation, large peaks are observed at very low temperatures both in Li+- and Na+-containing crystals. These peaks, which are distorted below ∼6 K due to the onset of quantum effects, may originate in alkali centers produced when alkali ions are liberated by the irradiation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 24: Symposium B – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1983 , 149
Copyright
Copyright © Materials Research Society 1984

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References

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