The effect of Ca-substitution in La-site on the magnetic properties of La2CoMnO6

Double perovskite La2-xCaxCoMnO6 (x = 0, 0.1, 0.2, 0.5) ceramics samples were synthesized by the standard solid-state reaction method. The crystal structures have been confirmed to be monoclinic perovskite structure with space group of P21/n at room temperature by the powder x-ray diffraction (Cu-Kα...

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Bibliographic Details
Published in:Journal of applied physics 2014-07, Vol.116 (3)
Main Authors: Li, Qiu-hang, Li, Na, Hu, Jian-zhong, Han, Qi, Ma, Qing-shan, Ge, Lei, Xiao, Biao, Xu, Ming-xiang
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Calcium ions
Chemical synthesis
Cobalt
Cooling curves
Coupling
Crystal structure
Curie temperature
Ferromagnetism
Magnetic properties
Magnetism
Manganese ions
Perovskite structure
Perovskites
Substitution reactions
X ray powder diffraction
X-ray diffraction
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Summary:Double perovskite La2-xCaxCoMnO6 (x = 0, 0.1, 0.2, 0.5) ceramics samples were synthesized by the standard solid-state reaction method. The crystal structures have been confirmed to be monoclinic perovskite structure with space group of P21/n at room temperature by the powder x-ray diffraction (Cu-Kα). The grains of the samples are relatively dense and distribute in random directions from the scanning electron microscope patterns. Holes are doped into La2CoMnO6 with the substitution of the Ca2+ ions in La-site, and further lead to the valences of Mn ions and Co ions transforming from Mn4+ and Co2+ to Mn3+ and Co3+, respectively. Ferromagnetic coupling of Mn4+-O2–-Co2+ and antiferromagnetic coupling of Mn3+-O2–-Co3+ are coexistent in La2-xCaxCoMnO6 system, which correspond to two transitions existed in field-cooling magnetization versus temperature curves. Curie temperature of La2-xCaxCoMnO6 system decreases with the increasing of Ca-substitution amount. The coexistence of different magnetic phases leads to the exchange bias effect.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4890321