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HomeMaterials Science ForumMaterials Science Forum Vols. 745-746Effects of Ho-Doping on Crystal Structure and...

Effects of Ho-Doping on Crystal Structure and Microstructure of La_0.7Sr_0.3MnO₃ Ceramics

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Abstract:

Crystal structure and microstructure of La_0.7-xHo_xSr_0.3MnO₃ (x=0.2,0.6) prepared by usual ceramic techniques and grinding procedure were investigated using X-ray diffraction (XRD) and transmission electron microscopy (TEM). When doping amount x equals to 0.2, incorporation of Ho atoms contributed to phase separation and coexistence of rhombohedral (La_0.7Sr_0.3MnO₃) and hexagonal (HoMnO₃) phases. La_0.7Sr_0.3MnO₃ phase is of typical perovskite structure, whereas, HoMnO₃ phase is non-perovskite structure. As x reaches 0.6, the volume fraction of HoMnO₃ phase was significantly increasing. Meanwhile, an orthorhombic lattice with perovskite structure and space group Pnma can be observed. It prevented from partial substitution of La³⁺ or Sr²⁺ by Ho³⁺ and the distortion of Mn-O octahedra.

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Periodical:

Materials Science Forum (Volumes 745-746)

Pages:

96-101

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.745-746.96

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Online since:

February 2013

Authors:

Ben Zhe Sun, Si Lang Zhou, Tie Shen

Keywords:

Crystal Structure, Microstructure, Mn-O Octahedra, Orthorhombic Lattice, Substitution

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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