Coupling Between Magnetic Exchange and Charge Activation in Cu-Doped LaFeO sub(3)

Material research on perovskite-type oxides (ABO sub(3)) has been driven by the recognition of their unique properties primarily attributed to the presence of oxygen octahedron (BO sub(6)). Since 2003, the discovery of strong coupling in TbMnO sub(3) and BiFeO sub(3) has stimulated new interests in...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2016-06, Vol.99 (6), p.2035-2039
Main Authors: Dogdibegovic, Emir, Cai, Qingsheng, James, William J, Yelon, William B, Anderson, Harlan U, Yang, Jin-Bo, Zhou, Xiao-Dong
Format: Article
Language:English
Subjects:
Activation
Bonding
Charge
Copper
Coupling
Formations
Neutron diffraction
Thermoelectricity
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Summary:Material research on perovskite-type oxides (ABO sub(3)) has been driven by the recognition of their unique properties primarily attributed to the presence of oxygen octahedron (BO sub(6)). Since 2003, the discovery of strong coupling in TbMnO sub(3) and BiFeO sub(3) has stimulated new interests in understanding the relationship between magnetic and electric properties in perovskites. In this article, we report our recent work on the magnetic superexchange interaction and charge formation in copper-doped LaFeO sub(3) using high-temperature neutron diffraction and thermoelectric measurements. In situ neutron diffraction measurements show a loss of antiferromagnetic ordering above 450 degree C. With an increase in Cu content, the (Fe, Cu)-O bond length decreases and the (Fe, Cu)-O-(Fe, Cu) bond angle increases, which leads to an enhancement of the Fe-O-Fe superexchange interaction. Thermoelectric and electrical measurements show that the formation of electron holes in Cu-doped LaFeO sub(3) is a thermally activated process with two distinct regions with a transition temperature near 450 degree C, in congruence with the magnetic measurements. Our work show that Cu is in 3+ state in La(Fe,Cu)O sub(3) at room temperature, resulting in the maximum superexchange interaction between Fe super(3+) ions.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14061