Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide

by Yu, Chun-cheng

Abstract (Summary)
La doped HoMn2O5 in studying the influence of the local structure distortion on the magnetic transition has been investigated systematically. It is found that by doping of La ions in a proper percentage, 0.1?x?0.2, the formation of the possible impurity RMnO3 (113) phase could be suppressed; single phases of LaxHo1-xMn2O5 (0.1?x?0.2) can be formed in one atmosphere of flowing oxygen. For x=0.2, an weak ferromagnetic transition on top of the paramagnetic background appears at 150K and saturated at 75K, which implies that the compound undergoes a ferromagnetic to antiferromagnetic transition. In addition, the lattice didn¡¦t appear a huge phase transition at low temperature, it¡¦s observed local distortion behavior within 100~150K, and back to normal structure as high temperature ones. It¡¦s convinced that will be associated with the magnetic properties, which need further examination and experiment.
Bibliographical Information:

Advisor:Shih-Jye Sun; Hsiung Chou; Hung-Duen Yang

School:National Sun Yat-Sen University

School Location:China - Taiwan

Source Type:Master's Thesis

Keywords:gsas phase transition jana multiferroic sol gel


Date of Publication:02/13/2009

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