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首页> 外文期刊>Materials Letters >Polymeric citrate precursor route to the synthesis of the high dielectric constant oxide, CaCu_3Ti_4O_(12)
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Polymeric citrate precursor route to the synthesis of the high dielectric constant oxide, CaCu_3Ti_4O_(12)

机译:柠檬酸聚合物前体途径合成高介电常数氧化物CaCu_3Ti_4O_(12)

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摘要

Using citric acid and ethylene glycol, a polymeric precursor of the above compound was obtained at low temperatures (135℃) which on subsequent heat treatments led to pure CaCu_3Ti_4O_(12) at 1000℃. On sintering further at 1000℃ (20 h), the disks show high density (98%) and the dielectric constant was of the order of 3000 at 1 kHz. The dielectric loss varies between 0.3 and 0.35 (till 100 kHz) beyond that it increases sharply from 0.35 to 0.7 in the frequency range of 100―500 kHz. Our studies on dielectric properties of the above oxide, synthesized by the ceramic method and sintered under the same conditions, led to a dielectric constant of around 2200 at 1 kHz. The dielectric constant decreases with frequency in the oxides obtained by either of the above methods. Scanning electron micrographs (SEM) show much larger grains (nearly spherical) of 2―4 μm in the solid obtained by the ceramic route while the grains were much smaller (0.5―1.0 μm) in the oxide prepared by the polymeric citrate precursor route.
机译:使用柠檬酸和乙二醇,在低温(135℃)下获得了上述化合物的聚合前体,随后在进行热处理时,在1000℃下产生了纯CaCu_3Ti_4O_(12)。在1000℃(20 h)下进一步烧结时,圆盘表现出高密度(98%),介电常数在1 kHz时约为3000。介电损耗在0.3到0.35(直到100 kHz)之间变化,在100-500 kHz的频率范围内介电损耗从0.35急剧增加到0.7。我们通过陶瓷方法合成并在相同条件下烧结的上述氧化物的介电性能研究得出,在1 kHz时介电常数约为2200。通过以上任一种方法获得的氧化物中的介电常数随频率降低。扫描电子显微照片(SEM)显示,通过陶瓷路线获得的固体中有2〜4μm的较大晶粒(近球形),而通过聚合柠檬酸盐前体路线制备的氧化物中的晶粒较小(0.5〜1.0μm)。

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