Dielectric responses and structure-property relationships of Ca1-xBaxWO4 composite microwave dielectric ceramics

作者：Wang, Xiangyu; Lv, Jiqing; Xu, Yue; Zhang, Lingcui; Shen, Yan; Zhou, Huanfu; Zhou, Di; Song, Kaixin; Guo, Hai; Shi, Feng^*

来源：Journal of Alloys and Compounds, 2022, 925: 166669.

DOI：10.1016/j.jallcom.2022.166669

• Microwave Dielectric Ceramics
• Lattice Vibrational Characteristics
• Dielectric Response
• Structure -Property Relationship
• Ca1-xBaxWO4

Ca1-xBaxWO4 (x = 0-0.25, CBWO) composite microwave dielectric ceramics were obtained after sintering at 1200 C for 4 h. X-ray diffraction and X-ray photoelectron spectroscopy were used to determine their complex phase structures. The lattice vibrational properties were revealed by Raman scattering and Fourier -transform infrared (FTIR) spectroscopy. The Raman spectra showed that phase-pure CaWO4 had eight active vibrational modes when x = 0.15-0.25. A new vibrational mode appeared near 927 cm(-1), which was attributed to BaWO4. The intrinsic properties were fitted and simulated by the four-parameter semi-quantum model according to the FTIR spectra. The low-frequency vibrational modes made a greater contribution to the intrinsic properties than the high-frequency modes. Structure-property relationships of the CBWO ceramics were obtained using Raman spectroscopy, and their dielectric responses were elucidated. The CBWO ceramic at x = 0.25 had excellent dielectric properties with epsilon(r) = 7.43 and Q x f = 56,929 GHz.

• 单位
  桂林理工大学; 西安交通大学