Low-Temperature Synthesis of Pure Ba(Mg_(1/3)Ta_(2/3))O_3 Microwave Dielectric Powder by Citrate Gel-Processing Route

A new citrate gel-processing route to synthesize pure BMT powder at low-temperature (600℃)was proposed and investigated by XRD, DTA and SEM methods, in which self-prepared Ta-citrate wajs adopted as the starting precursor. The conventional approach from high pllrity Ta2O5 powder was also as starting material to prepare BMT powder for comparison. It was discovered that a pure BMT phajse with pseudocubic perovskite strcuture was formed at much lower temperature (600℃)and nano-particle size powder (100-200nm) was obtained by the citrate gel-process. Whereas, the synthesizing temperature of conventional one was more than 1250℃.