A low-ε and high-Q microwave dielectric ceramic Li2SrSiO4 with abnormally low sintering temperature
A low-ε and high-Q microwave dielectric ceramic Li2SrSiO4 with abnormally low sintering temperature
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DOI：
10.1016/j.jeurceramsoc.2021.08.049
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发表时间：
2021-08
影响因子：
5.7
通讯作者：
Qianbiao Du;Ying Tang;Jie Li;Weishuang Fang;Aihong Yang;Junqi Chen;L. Fang
中科院分区：
文献类型：
--
作者：
Qianbiao Du;Ying Tang;Jie Li;Weishuang Fang;Aihong Yang;Junqi Chen;L. Fang
采用固相反应法合成了一种新型低ε兰德高Q值的低温共烧Li 2SrSiO 4陶瓷。XRD结果表明，Li 2SrSiO 4陶瓷为六方晶系，空间群为P3121。在880 °C烧结的Li 2SrSiO 4陶瓷的微波介电性能为εr= 7.4 ± 0.1，Q ×f= 100，700 ± 2000 GHz，τf= −85.4 ± 2.4 ppm/℃。P单键/L化学键理论表明，Li 2SrSiO 4陶瓷的低温烧结可能是由于Si单键O键的弱共价性（18%）所致。在0.94Li2SrSiO4- 0.06SrTiO3复相陶瓷中加入SrTiO 3，可获得近零的τf（1.9 ± 1.8ppm/℃），εr= 8.2 ± 0.1，Q ×f= 63，200 ± 1900 GHz。考虑到其与Ag粉的化学相容性，Li 2SrSiO 4陶瓷可以作为LTCC应用的候选介电材料。
A novel low-temperature co-fired ceramic Li2SrSiO4with low-εrand high-Qwas synthesized through solid-state reaction. XRD results showed that the Li2SrSiO4ceramic formed a single hexagonal structure with a space group ofP3121. The microwave dielectric properties of Li2SrSiO4ceramic sintered at 880 °C wereεr= 7.4 ± 0.1,Q×f= 100,700 ± 2000 GHz, andτf= −85.4 ± 2.4 ppm/℃. The Psingle bondVsingle bondL chemical bond theory indicated that the low sintering temperature of Li2SrSiO4ceramic might be ascribed to the weak covalency (18 %) of Sisingle bondO bond. A near-zeroτf(‒1.9 ± 1.8 ppm/℃) combined withεr= 8.2 ± 0.1, andQ×f= 63,200 ± 1900 GHz was obtained by adding SrTiO3to form 0.94Li2SrSiO4- 0.06SrTiO3composite ceramic. Given their chemical compatibility with Ag powders, the Li2SrSiO4ceramics can be a candidate dielectric material for LTCC applications.