CaCu3Ti4O12 (CCTO) electro ceramic was prepared by a solid-state reaction technique. The formation of CCTO was confirmed by X-ray diffraction (XRD). Pellets of calcined powder were sintered at different temperatures for two different durations, i.e., 2 and 10 h (h). The morphology and grain size of the samples were observed using scanning electron microscopy (SEM). SEM images showed that the minor phase (CuO) plays an important role in the growth of grain size. It seems that higher sintering temperatures led to change in the oxidation states of Cu and Ti, which increase the volume fraction of the CuO minor phase. Dielectric studies show that the dielectric constant is increasing with increasing sintering temperature, holding time, and presence of the CuO phase. The highest dielectric constant of ~ 41,000 was observed for CCTO samples sintered at 1100 °C for 10 h. The present samples find application in the energy storage devices.

中文翻译：

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微量相 (CuO) 对 CaCu3Ti4O12 陶瓷的可烧结性、晶粒尺寸和介电性能的影响

CaCu3Ti4O12 (CCTO) 电陶瓷是通过固态反应技术制备的。X射线衍射（XRD）证实了CCTO的形成。煅烧粉末的颗粒在不同温度下烧结两种不同的持续时间，即 2 小时和 10 小时 (h)。使用扫描电子显微镜（SEM）观察样品的形貌和晶粒尺寸。SEM 图像显示次要相 (CuO) 在晶粒尺寸的增长中起重要作用。似乎较高的烧结温度会导致 Cu 和 Ti 的氧化态发生变化，从而增加 CuO 次要相的体积分数。介电研究表明，介电常数随着烧结温度、保温时间和 CuO 相的存在而增加。最高介电常数~41，对于在 1100 °C 下烧结 10 小时的 CCTO 样品，观察到 000。本样品在储能装置中得到应用。