Abstract Structural and magnetic properties of 0.8BiFeO3–0.2CaTiO3 (BF-20CT) nanoparticles were investigated systematically as a function of heat treatment at 500 °C, 650 °C, 800 °C and 950 °C of a sol-gel derived powder. The structural investigation by the Rietveld refinement revealed the phase transformation from monoclinic (Cc) to rhombohedral (R3c) structure. The lattice parameters, bond angles, bond distance, and unit cell volume significantly changed as temperature increases from 500 to 950 °C. TEM investigation has confirmed the size, morphology, and microstructure of the BF-20CT nanoparticles. Enhanced magnetization with the finite coercive field was observed as phase changed from monoclinic (Cc) to rhombohedral (R3c). The splitting in zero-field cooling (ZFC) and field cooling (FC) magnetization curves with a sharp peak in the ZFC curves revealing a spin-glass type behavior.

中文翻译：

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多铁性 0.8BiFeO3–0.2CaTiO3 纳米颗粒的尺寸相关相变及其与磁性能的相关性

摘要 系统研究了 0.8BiFeO3–0.2CaTiO3 (BF-20CT) 纳米粒子的结构和磁性能与溶胶凝胶衍生粉末在 500°C、650°C、800°C 和 950°C 下热处理的函数关系。Rietveld 细化的结构研究揭示了从单斜 (Cc) 到菱面体 (R3c) 结构的相变。随着温度从 500°C 升高到 950°C，晶格参数、键角、键距和晶胞体积发生显着变化。TEM 研究证实了 BF-20CT 纳米粒子的尺寸、形态和微观结构。当相从单斜晶 (Cc) 变为菱面体 (R3c) 时，观察到具有有限矫顽场的增强磁化。