Crystal structure, phonon characteristics, and dielectric properties of CaMgGe 2O6: A novel diopside microwave dielectric ceramic

作者：Cao, Yucheng; Zhang, Liangbin; Mei, Hongrong; Rao, Zhenggang^*; Tian, Tingfang; Li, Chunchun^*

来源：Ceramics International, 2022, 48(6): 8783-8788.

DOI：10.1016/j.ceramint.2022.01.270

• Ceramics
• Diopside structure
• Microwave dielectric properties
• Low permittivity
• Far-infrared spectra

The monoclinic diopside structured CaMgGe2O6 dielectric ceramics were synthesized by the traditional solid-phase reaction method, and their microwave dielectric properties were characterized. X-ray diffraction (XRD) and Rietveld refinement revealed that CaMgGe2O6 belongs to the monoclinic system of space group C2/c. SEM images showed that dense CaMgGe2O6 ceramics could be formed at the optimum sintering temperature of 1300 degrees C. Typically, ceramic sintered at 1300 degrees C for 6 h possessed outstanding microwave dielectric properties with epsilon(r) similar to 7.96, Q x f similar to 41,280 GHz, and tau(f) similar to -46.6ppm/degrees C. Far-infrared spectra analysis revealed the intrinsic microwave dielectric properties of CaMgGe2O6 ceramics. These findings demonstrate promising application prospects of CaMgGe2O6 in microwave substrate materials.

• 单位
  南昌大学; 桂林理工大学