烧结温度对BaCu_3Ti_4O_(12)介电性能的影响

Effect of Sintering Temperature on Dielectric Properties of BaCu_3Ti_4O_(12)

利用固相反应法在950℃预烧结、不同烧结温度条件下制备了BaCu_3Ti_4O_(12)(BCTO)陶瓷样品,测量了各样品在不同频率下的介电常数和介电损耗随温度的变化关系,发现BCTO的介电常数比CaCu_3Ti_4O_(12)的介电常数小。容差因子计算发现BCTO的晶体结构容易畸变,XRD图分析表明样品中除了含有BCTO晶相外,还含有Cu_3TiO_5和Cu_3TiO_4等杂质,从而大大降低了BCTO的介电常数。

BaCu3 Ti4 O12 （BCTO） ceramics were prepared by the traditional solid-state reaction technique and calcined at 9500C, and sintered at different temperature. The temperature dependence of dielectric constant and dielectric loss at different frequencies of each sample were measured. The dielectric constant of BCTO was small than CC- TO＇s. Tolerance factor analysis found that the crystal structure of BCTO was easy distortion. XRD showed that the samples not only contained BCTO phase, but also impurities such as Cu3 TiO5 and Cu3TiO4.