Química Nova | |
Propriedades estruturais e microestruturais de manganitas dopadas com cobre | |
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
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO202103040062199ZK.pdf | 756KB | download |