Contrasting microwave dielectric properties of zircon-structured AEuV2O8 (A = Bi, La) ceramics

作者：Hu, Xiaowen; Chen, Jinwu; Li, Jie^*; Xiang, Huaicheng; Tang, Ying; Fang, Liang^*

来源：Journal of the European Ceramic Society, 2022, 42(16): 7461-7467.

DOI：10.1016/j.jeurceramsoc.2022.09.007

• Microwave dielectric performance
• Zircon structure
• Bond valence
• Rattling effect
• Compressed effect

Two zircon-structured ceramics AEuV2O8 (A = Bi, La) were prepared with optimal sintering temperatures of 900 degrees C and 1375 degrees C, respectively. They exhibited sharp contrast performances with medium er -28.7 +/- 0.1, Q x f -14,000 +/- 300 GHz, and large positive zf -75.7 +/- 2.0 ppm/degrees C for BiEuV2O8, whereas low er -10.4 +/- 0.1 Q x f -25,100 +/- 300 GHz, and negative zf - -40.7 +/- 2.0 ppm/degrees C for LaEuV2O8. The rattling effect at the A -site was more dominant in determining microwave dielectric properties than that of compressed V5+ at the B -site. It resulted in the higher er, lower Q x f and ze, and larger zf of BiEuV2O8 than those of LaEuV2O8. Besides, their Q x f was related with the relative density, bond valence and FWHM of the B1 g Raman mode.

• 单位
  广西大学; 桂林航天工业学院; 桂林理工大学