Li2ZnTi3O8掺杂对0.7CaTiO3-0.3NdAlO3微波介质陶瓷低温烧结及介电性能的影响

Effects of Li2ZnTi3O8 Additives on Sintering and Dielectric Properties of 0.7CaTiO3-0.3NdAlO3 Microwave Dielectric Ceramics

采用固相合成法制备0.7CaTiO3-0.3NdAlO3微波介质陶瓷,研究添加不同含量的Li2ZnTi3O8,在不同的烧结温度下,对其烧结特性和微波介电性能的影响。结果表明,掺入Li2ZnTi3O8烧结温度降低了150℃;Li2ZnTi3O8不同添加量下,其介电常数随烧结温度升高而增大,但增加不明显;而随着添加量的增加,其介电常数也随之增大。品质因素随着烧结温度升高而升高,随着Li2ZnTi3O8添加量的增大而降低。添加1 wt%Li2ZnTi3O8的陶瓷样品在1400℃烧结,性能最佳,介电常数达到46,品质因素可达到25000 GHz。

0.7CaTiO3-0.3NdAlO3 microwave dielectric ceramics doped with Li2ZnTi3O8 were prepared by solid-phase method. The sintering and microwave dielectric properties were studied. The results reveal that Li2ZnTi3O8 can effectively lower the sintering tempetarure about 150 ℃. Under different additions, the dielectric constant increases with the increase of sintering temperature, but the increase is not obvious. The dielectric constant decreases as Li2ZnTi3O8 doping content increasing. The quality factor decreases as sintering temperature increasing, reduced as Li2ZnTi3O8 additions increasing. Doped 1 wt% Li2ZnTi3O8 and sintered at 1400 ℃ has the optimum dielectric performance: dielectric constant=46, the quality factor Q·f=25 222 Ghz.