Improving quality factor of Nd_2MoO_6 ceramics by removing moisture content

摘要

The effect of removing moisture content in starting raw materials on the microwave dielectric properties of Nd_2MoO_6 ceramics was investigated. The Nd_2MoO_6 ceramics were prepared by the conventional solid-state method with various sintering temperatures and sintering times. A maximum density of 6.08 g/cm~3 was obtained for Nd_2MoO_6 ceramic, sintered at 1350 ℃ for 4 h. Dielectric constants (ε_r) of 13.6-13.8 and quality factor (Q × f) of 18,400-66,400 GHz were obtained at sintering temperatures in the range 1250-1400 ℃ for 4 h. Dielectric constants (ε_r) of 13.5-13.8 and quality factor (Q × f) of 44,000-66,400 GHz were obtained for sintering times in the range 2-6 h at a sintering temperature of 1350 ℃. A dielectric constant (ε_r) of 13.8, a quality factor (Q × f) of 66,400 GHz, and a temperature coefficient of resonant frequency (τ_f) of -53 ppm/℃ were obtained when Nd_2MoO_6 ceramics were sintered at 1350 ℃ for 4 h.