A novel ultra-high Q microwave dielectric ceramic ZnMgTiO4 with spinel structure

作者：Wang, Yajie; Li, Jie^*; Fang, Weishuang; Tang, Ying; Zhang, Ziyi; Xiang, Huaicheng; Fang, Liang^*

来源：Ceramics International, 2023, 49(22): 35420-35427.

DOI：10.1016/j.ceramint.2023.08.218

• Spinel structure
• Ultra -high Q ceramic
• Microwave dielectric properties
• ZnMgTiO4

Novel ultra-high Q ceramic ZnMgTiO4 was prepared using solid-state synthesis. For the first time, the crystal structure, sintering behaviour and microwave dielectric properties of ZnMgTiO4 ceramic were investigated. ZnMgTiO4 ceramics formed a cubic spinel (space group Fd 3 m) single-phase for sintering within 1340 degrees C1400 degrees C, with Zn2+ occupying the tetrahedral site, Mg2+ and Ti4+ distributing randomly in the octahedral site, whereas a trace of MgTiO3 appeared at 1420 degrees C. At 1400 degrees C: epsilon r = 16.8, Q x f = 202,021 GHz, and zf = -38 ppm/ degrees C, excellent microwave dielectric properties were obtained, and CaTiO3 compensated the negative zf to nearzero. A substantial 29% deviation between the measured Cr and the theoretical eth could be attributed to the potential underestimation of ionic polarizability of Ti4+. Phillips-Van Vechten-Levine theory suggested that dielectric polarization and intrinsic loss were primarily influenced by the Ti-O bonds. As a conclusion, ZnMgTiO4 ceramic emerges as a promising candidate for 5G/6G wireless communication devices.

• 单位
  桂林理工大学; 广西大学