Ln₂Mo₃O₁₂ (Ln=La, Nd): A novel group of low loss microwave dielectric ceramics with low sintering temperature

Ln₂Mo₃O₁₂ (Ln=La, Nd) ceramics with a defect scheelite related structure were prepared via a solid state reaction method. The La₂Mo₃O₁₂ ceramics sintered at 930 °C for 2 h exhibited a low dielectric permittivity of 10.1, a high quality factor (Qf value) of 60,000 GHz and a temperature coefficient of-80 ppm/°C at 12.7 GHz. The Nd₂Mo₃O₁₂ ceramics sintered at 945 °C for 2 h possessed a dielectric permittivity of 8.2, a Qf value of 80,000 GHz, and a temperature coefficient of-60 ppm/°C at 15.8 GHz. This group of ceramics could be good candidates for microwave substrate applications.