Open AccessDependence of magnetoelectric properties of La0.8Ba0.2MnO3 on Mn valence of oxide precursors
Author(s) -
Jimmy Kuo,
Li He-Fei,
MingShien Wen,
Shengkai Gong
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.4374
Subject(s) - valence (chemistry) , materials science , curie temperature , condensed matter physics , oxide , electrical resistivity and conductivity , atmospheric temperature range , magnetoresistance , sintering , ion , oxygen , thermodynamics , ferromagnetism , metallurgy , chemistry , physics , magnetic field , organic chemistry , quantum mechanics
The influence of temperature (in the range of 2—390K) on the magnetic moment,and magnetoresistance has been investigated in this paper. It is found that the magnetoelectric properties, particularly the Curie temperature TC, th e metal-insulator transition temperature, Tmi, and the maximum m agnetoresistance TMR, of La0.8Ba0.2MnO 3 are closely related to the valence of Mn in the oxides. La0.Ba.2M nO3 synthesize d with 2+ Mn oxides exhibited the lower resistivity, and a Curie temp erature c loser to room temperature (290K) compared with that synthesized with 3+ Mn ox ides. It can be concluded that the magnetoelectric properties of La0.8Ba 0.2MnO3 are dependent on the Mn valence of oxides. This cou ld be attribut ed to the influence of oxygen vacancy concentration variation on the Mn4+ /M n3+ ratio in the resultant compounds during solid sintering react ion, which results from the valence difference of oxide precursors.