Structural and microstructural properties of Cu-doped manganites

Química Nova

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