Abstract
The low-temperature thermal conductivity of Premium Q and Electronic Grade synthetic a-quartz has been measured. Substitutional aluminum is the primary active impurity in Premium Q quartz. Irradiation at room temperature of the unswept Premium Q sample caused a dip in the thermal conductivity near 4 K. This dip can be described by a simple resonant phonon scattering relaxation time with a resonant frequency of 2.75×1012 rad/sec. A room-temperature irradiation of unswept quartz produces both [Ale+]0 and Al-OH centers either of which might cause a resonant phonon scattering. After the premium Q sample was electrolyzed (swept) in hydrogen to remove the alkalis and the [Ale+]0 center and to produce the Al-OH center, the resonant scattering was slightly enhanced. Consequently, the Al-OH center rather than the [Ale+]0 center must be responsible for this scattering. The Electonic Grade sample which has additional OH related defects showed a strongly suppressed thermal conductivity.
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