- 作者: CHENG-LIANG HUANG AND JSUNG-TA TSAI
- 中文摘要: The effects of sintering temperature on the microwave dielectric properties and the microstructure of CaO-Li2 O-Sm2 O3 -TiO2 ceramics were investigated. CaO-Li2 O-Sm2 O3 -TiO2 with the composition CaO : LiO2 : Sm2 O3 : TiO2 = 16 : 9 : 12 : 63 was previously proposed as an excellent microwave dielectric material. Although the proposed composition was reported to consist of the perovskite phase with residual TiO2 as the second phase, the X-ray reflection lines of TiO2 were not detected in our specimens. The structure of our specimen was that of an orthorhombic perovskite throughout the entire range of sintering temperature (1250????C ~ 1370????C). The dielectric properties were found to strongly depend on the sintering conditions. The dielectric constant and temperature coefficient for the resonant frequency were found to decrease as the sintering temperature increased, while the Q . f value exhibited a different trend: the material showed a maximum Q . f value of 5700 (GHz) for sintering at 1310????C. At 1350????C, the dielectric properties with an ? r value of 102, a Q . f value of 5150 and a ? f value of 8 ppm/?C were suggested for practical applications.
- 英文摘要: --
- 中文關鍵字: microwave dielectric ceramics, perovskite, solid state reaction method
- 英文關鍵字: --