B_2O_3对BaO-Sm_2O_3-TiO_2微波介质陶瓷性能的影响

Effects of B_2O_3 on the performance of BaO-Sm_2O_3-TiO_2 microwave dielectric ceramics

为了满足微波器件小型化的需要,开发高介电常数的低温烧结微波介质材料成为一种趋势.采用复合掺杂低熔点氧化物来降低BaO-Sm2O3-TiO2系(BST)微波介质陶瓷的烧结温度,通过X射线衍射和扫描电子显微镜分析其物相组成和显微结构,用阻抗分析仪测量了陶瓷材料的介电性能.结果表明:在Ba4(Sm1-0.15Bi0.15)28/3Ti18O54的基质陶瓷材料中,复合掺杂3%的ZnO和2%的B2O3时,其烧结温度为1060℃,得到的BST微波介质陶瓷的介电性能为:εr≈64,tanδ≈1.2×10-3,τf=-8.3×10-5/℃.

To develope the ceramic material with low-temperature sintering and high-e microwave dielectric to fulfill the miniaturization of microwave ceramic capacitors, low melting point oxides were added into BaO - Sm2O3 -TiO2 （BST） microwave dielectric ceramics to decrease the sintering temperature. The phase composition and microstructure of the ceramics were examined by X-ray diffraction radiation and scanning electron microscope, respectively. The dielectric property was measured by an impedance analyzer. Results indicated that, in Ba4 （Sm1-0.15Bi0.15 ）28/3Ti18 O54 system, the sintering temperature was 1060 ℃ when the adding content of ZnO and B2O3 was 3wt% and 2wt% , respectively. The performance of BST microwave dielectric ceramics was listed as follows： εr≈64,tanδ≈1.2×10-3,τf=-8.3×10^-5/℃. The ceramic material would be a promising candidate for microwave resonators and filters.