Química Nova | |
Structural and microstructural properties of Cu-doped manganites | |
Universidade Federal do Espírito Santo, Vitória, Brasil1  Victor, Rodolfo Araujo1  Orlando, Marcos Tadeu D'Azeredo1  Freitas, Jair C. C.1  | |
关键词: manganites; X-ray diffraction; scanning electron microscopy.; | |
DOI : 10.1590/S0100-40422007000700004 | |
学科分类:化学(综合) | |
来源: Sociedade Brasileira de Quimica | |
【 摘 要 】
We report a structural study on polycrystalline La0.86Sr0.14Mn1-y CuyO3+d 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】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912050593921ZK.pdf | 756KB | download |