ABSTRACT We report the synthesis of barium cerium manganite (BaMn0.94Ce0.06O3) single perovskite by using a conventional high-temperature solid-state reaction method. A structural phase transition occurs from hexagonal to orthorhombic confirmed by XRD data analysis after doping cerium (Ce) to the pure barium manganite (BaMnO3) matrix. The average crystallite size of the sample is about 63.38 nm. The lattice strain produced due to the addition of Ce dopant in the host matrix is about 0.00142. The SEM micrograph suggests the average grain size is about 30 μm. It is observed that the grain plays a dominant role compare to grain boundaries in defining the conductivity in the sample. The thermally activated relaxation process is controlled by the immobile charge carriers in the host materials at low-temperature range while controlled by defects at higher temperatures. From all the results, it is confirmed that the sample is dominated by the hopping process. The semicircular Nyquist plots confirm the semiconducting nature of the sample which is well supported by Cole-Cole plots.

中文翻译：

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制备方法及铈掺杂剂对BaMnO3单钙钛矿性能的影响

摘要 我们报告了使用常规高温固相反应法合成钡铈锰酸钾 (BaMn0.94Ce0.06O3) 单一钙钛矿。在将铈 (Ce) 掺杂到纯锰酸钡 (BaMnO3) 基体后，XRD 数据分析证实了结构相变发生从六方到正交。样品的平均微晶尺寸约为 63.38 nm。由于在基质中添加 Ce 掺杂剂而产生的晶格应变约为 0.00142。SEM 显微照片表明平均晶粒尺寸约为 30 μm。据观察，与晶界相比，晶粒在定义样品的电导率方面起主导作用。热激活弛豫过程在低温范围由主体材料中的固定电荷载流子控制，而在高温范围由缺陷控制。从所有的结果来看，可以确认样本以跳跃过程为主。半圆形 Nyquist 图证实了样品的半导体性质，Cole-Cole 图很好地支持了这一点。