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

BIAN Jian-Jiang; ZHAO Mei-Yu; YIN Zhi-Wen(Shanghai Institute of Ceramics, ChInese Academy of Sciences Shanghai 200050 China)  
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℃.
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