| Autor: |
Hill, G. J., Pells, G. P., Barnett, M. A. |
| Zdroj: |
Radiation Effects and Defects in Solids; September 1986, Vol. 97 Issue: 3 p221-225, 5p |
| Abstrakt: |
The dielectric properties (εand tan δ) of aluminium oxynitride (AlON), and two grades of commercial alumina (99.9% and 97.5% A1203) have been measured after neutron irradiation doses to faiences ranging from 1017 to 1020 n/cm2. The measurements span the frequency range 0.1 to 65 MHz and thus include the ion cyclotron resonance frequencies currently being considered for plasma heating in fusion reactors. The permittivity (Ψ) has been measure by a two fluid technique with an accuracy of better than + / - 1%. A 2% increase in permittivity has been observed after irradiation to 1019 n/cm2.The dielectric loss in AlON increased by approximately × 10 while that for the alumina increased by approximately × 3. After neutron irradiation to 1019 n/cm2, there was little difference in the loss factor of the irradiated alumina and AlON. The less pure ceramic (97.5%) was found to have lower loss than the high purity material. This may indicate the contribution of grain boundaries to the loss as the 99.9% material was of much finer grain size (∼ 1μm) than the 97.5% material (∼ 10μm). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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