Propriedades estruturais e microestruturais de manganitas dopadas com cobre

Química Nova

Rodolfo Araujo Victor¹  Marcos Tadeu D'azeredo Orlando¹  Jair C. C. Freitas¹ 

[1] ,Universidade Federal do Espírito Santo Departamento de Física Vitória ES ,Brasil

关键词: manganites;    X-ray diffraction;    scanning electron microscopy;   

DOI  :  10.1590/S0100-40422007000700004

来源: SciELO

【 摘 要 】

We report a structural study on polycrystalline La0.86Sr0.14Mn1-y Cu yO3+delta samples (y = 0, 0.05, 0.10, 0.15, 0.20) using refinement of powder X-ray diffraction data and analysis of scanning electron microscopy images. It is found that the structure remains rhombohedral through the whole series, with a decrease in the average Mn-Mn bond distances, slight variations in Mn-O-Mn angle and reduction in the unit cell volume with increasing Cu amounts. The values of Mn-Mn distances suggest compact structures with d within ±1%. Scanning electron microscopy images reveal homogeneous microstructure in all samples, besides a trend for smaller grains and larger porosity with increasing Cu content.

【 授权许可】

CC BY-NC   
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