Abstract In this study, CaCu3Ti4O12 ceramic composites were prepared through solid-state reaction by adding Sr2+ and removing Cu2+. Application of the Rietveld method and structure refinement revealed the presence of pure CaCu3Ti4O12 (CCTO) phase for x = 0.00 and Sr0.75Ca0.25TiO3 (SCTO) phase for sample x = 3.00. The other samples presented a mixture of both phases. The sample microstructures showed that increasing the amount of SCTO phase led to the formation of cubic CCTO grains. The x = 0.15 sample presented giant dielectric permittivity results, 3.28 × 105, associated with increased grain size and greater grain boundary capacitance, thus indicating it could be a promising material for class III capacitors. On the other hand, greater presence of the SCTO phase displayed potential non-ohmic behavior, as seen with sample x = 2.70, which has a high nonlinear coefficient (α ∼ 30.0) and low current leakage, (IL ∼ 9.0 μA).

中文翻译：

---

Sr2+对CaCu3Ti4O12基陶瓷复合材料的介电和非欧姆分析

摘要 本研究通过添加Sr2+和去除Cu2+的固相反应制备CaCu3Ti4O12陶瓷复合材料。Rietveld 方法和结构精修的应用揭示了 x = 0.00 的纯 CaCu3Ti4O12 (CCTO) 相和样品 x = 3.00 的 Sr0.75Ca0.25TiO3 (SCTO) 相的存在。其他样品呈现两相的混合物。样品微观结构表明，增加 SCTO 相的数量导致立方 CCTO 晶粒的形成。x = 0.15 样品呈现出巨大的介电常数结果，3.28 × 105，与增加的晶粒尺寸和更大的晶界电容相关，因此表明它可能是 III 类电容器的有前途的材料。另一方面，更多的 SCTO 相显示出潜在的非欧姆行为，如样品 x = 2.70 所见，