The millimeter-wave dielectric properties of Al2O3after irradiation to moderate neutron fluence
- 1 November 1991
- journal article
- research article
- Published by Taylor & Francis in Radiation Effects and Defects in Solids
- Vol. 119-121 (2) , 861-866
- https://doi.org/10.1080/10420159108220833
Abstract
Mono- and polycrystalline Al2O3 has been irradiated to 3.5· 1019 f.n/cm2, and the increase in dielectric loss has been measured at 28–38 GHz and 144–146 GHz. Step annealing experiments have been performed between 150 °C and 1100 °C. The recovery of dielectric loss has been analyzed aiming at identifying the defect types affecting dielectric loss. A pronounced recovery step observed at 450–550 °C is explained by F-centres with strong electron-lattice coupling which contribute predominantly to dielectric loss at room temperature.Keywords
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