1. Dielectric Properties of Compacts Sintered after High-Pressure Forming of Lithium Fluoride
- Author
-
Pavel Ctibor, Libor Straka, Josef Sedláček, and František Lukáč
- Subjects
high-pressure forming ,lithium fluoride ,dielectrics ,optical properties ,Technology ,Chemical technology ,TP1-1185 - Abstract
High-pressure forming at 300 MPa and room temperature was applied before the sintering of a lithium fluoride (LiF) powder. The as-fired samples were tested as dielectrics and showed very interesting characteristics. The best sample, sintered at 750 °C for 8 h, had a relative permittivity of 12.1 and a loss tangent of 0.0006, both of them frequency-independent and temperature-independent up to at least 150 °C, and moreover, the volume DC resistivity was 27.4 × 1012 Ωm at room temperature. These parameters are comparable with oxide ceramics, processed at temperatures over 1300 °C, as for example, aluminum dioxide (Al2O3) or Y3Al5O12 (YAG). LiF material is advantageous because of its very low sintering temperature, which is only about one-half of typical oxide ceramic dielectrics. more...
- Published
- 2023
- Full Text
- View/download PDF