Synthesis and microwave dielectric properties of CaMgSi2O6 nanopowder prepared at low temperature

Using LiNO3, NH4VO3, Ca (NO3)(2) center dot 4H(2)O, Mg (NO3)(2) center dot 6H(2)O and Si (OC2H5)(4) as raw materials, CaMgSi2O6 microwave dielectric ceramic nanopowders were prepared at low temperature by sol-gel method. The sintering characteristic and dielectric properties of powders were studied. The results show that the crystallization temperature is decreased enormously by introduction of Li-V liquid phase sintering aids into Ca-Mg-Si materials, and the powder calcined at 750 degrees C has particle sizes of 78 similar to 99 nm with the CaMgSi2O6 as the main crystalline phase. The dielectric ceramic made from powders calcined at 750 degrees C achieves more compact structure at the sintering temperature of 890 degrees C, and then has good microwave dielectric properties; the dielectric constant, quality factor and temperature coefficient of resonant frequency is 7.68, 24 542 GHz and -57.25 x 10(-6) degrees C-1, respectively, which is appropriate to prepare low temperature cofired minisize multilayer component.