Microwave dielectric performances of a novel low permittivity NaCaLa(MoO4)3 ceramic for LTCC applications

作者：Liu, Kaiyang; Liang, Jun; Chen, Xiuli^*; Zhou, Huanfu^*

来源：Journal of Materials Science: Materials in Electronics , 2023, 34(10): 924.

DOI：10.1007/s10854-023-10350-9

• SYSTEM
• GLASS
• CRYSTAL
• BA
• CA

A novel low-fired NaCaLa(MoO4)(3) ceramic was synthesized via a conventional solid-state reaction method. The sintering behavior, phase structure, morphology, and microwave dielectric properties of ceramic were systematically investigated. NaCaLa(MoO4)(3) compound was confirmed to be a single-phase with a tetragonal scheelite structure of I4(1)/a space group. The sintering temperature will affect the cationic ordering of NaCaLa(MoO4)(3) ceramics, thereby affecting the quality factor. NaCaLa(MoO4)(3) ceramics exhibited a high relative density above 98% in the all sintering ranges, especially the maximum relative density reached 98.34%. The theoretical dielectric constant and packing fraction were calculated based on the refined parameters. The calculations for the chemical bonds of NaCaLa(MoO4)(3) ceramics show that NaCaLa-O bond and Mo-O bond have the upper hand in dielectric constant and quality factor, respectively. NaCaLa(MoO4)(3) ceramic sintered at 825 degrees C demonstrates foremost microwave dielectric properties with low epsilon(r) = 10.72, high Q x f = 49,495 GHz, and tau(f) = - 49 ppm/degrees C. Momentously, NaCaLa(MoO4)(3) ceramic had a good compatibility with Ag powder, suggesting that it is a potential candidate for LTCC applications.

• 单位
  桂林理工大学