High-Q microwave dielectrics in wolframite magnesium zirconium tantalate ceramics

作者：Lyu, Xiao-Song; Li, Ling-Xia^*; Sun, Hao; Zhang, Shuai; Li, Sai

来源：Ceramics International, 2016, 42(1): 2036-2040.

DOI：10.1016/j.ceramint.2015.10.011

• C. Dielectric properties
• D. Tantalates
• Ceramics
• Low loss

A new high-Q microwave dielectric ceramic MgZrTa2O8 was investigated for the first time. Single monoclinic-structured MgZrTa2O8 was obtained by the conventional solid-state route and sintered at 1390-1470 degrees C for 5 h. The variation trend of dielectric constant was in accordance with that of relative density and ionic polarizability. The Q x f value increased by increasing the packing fraction. The temperature coefficient of T-f correlated with the variation of bond valence of Ta-site. In summary, the MgZrTa2O8 ceramic sintered at 1450 degrees C showed excellent microwave dielectric properties of epsilon(r)similar to 29.5, Q x f similar to 140,900 GHz, tau(f)similar to-44.3 ppm/degrees C. These make MgZrTa2O8 material a very promising candidates for the application in microwave electronics.

• 出版日期2016-1
• 单位天津大学