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Synthesis and Structure of Nanocrystalline La0.50Ba0.50MnO3

机译：纳米La0.50Ba0.50MnO3的合成与结构

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摘要

Nanocrystalline manganite La0.50Ba0.50MnO3 was synthesized by the soft-chemical method. For this purpose, the sol-gel method was modified and improved. A trihydric saturated alcohol, e.g., glycerol, was suggested as a new organic matrix. The crystal structure of the composite was studied by X-ray powder diffraction at room temperature. A La0.50Ba0.50MnO3 powder annealed in air at T = 500 degrees C is characterized by a perovskite-like cubic structure with the unit-cell parameter a = 3.869 angstrom. The chemical composition of the sample was studied by electron-probe X-ray microanalysis. The La : Ba : Mn cation ratio in the material was 1 : 1 : 2. The surface topography was examined with a scanning electron microscope. The crystallite size was similar to 30 nm. The dependence of the crystal structure and the surface topology on the annealing temperature was studied. The high-temperature treatment in air resulted in the growth of larger, micrometer-size, crystallites.
机译：采用软化学法合成了纳米晶锰矿La0.50Ba0.50MnO3。为此，对溶胶-凝胶法进行了改进和改进。建议使用三元饱和醇，例如甘油作为新的有机基质。在室温下通过X射线粉末衍射研究了复合材料的晶体结构。在T = 500℃下在空气中退火的La0.50Ba0.50MnO3粉末的特征是钙钛矿样立方结构，其晶胞参数a = 3.869埃。通过电子探针X射线显微分析研究了样品的化学组成。材料中的La∶Ba∶Mn阳离子比为1∶1∶2。用扫描电子显微镜检查表面形貌。微晶尺寸类似于30nm。研究了晶体结构和表面拓扑对退火温度的依赖性。空气中的高温处理导致更大，微米大小的微晶的生长。

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