Preparation and monte carlo simulation of La(0.67)Ca(0.33)MnO(3)/Cr(2)O(3) composites

The (1 - x) La(0.67)Ca(0.33)MnO(3) (LCMO) + x Cr(2)O(3) composites were synthesized by a new Uqwd phase method. The XRD and SEM measurements reveal that few Cr(2)O(3) were solubk in the LCMO structure and the lattice constant of LCMO almost did not change, while most Cr(2)O(3) were distributed at th...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2006-09, Vol.21 (3), p.103-105
Main Authors: Rao, Yunhua, Liu, Peng, Wang, Zmguo, Cao, Yang
Format: Article
Language:English
Online Access:Get full text
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Summary:The (1 - x) La(0.67)Ca(0.33)MnO(3) (LCMO) + x Cr(2)O(3) composites were synthesized by a new Uqwd phase method. The XRD and SEM measurements reveal that few Cr(2)O(3) were solubk in the LCMO structure and the lattice constant of LCMO almost did not change, while most Cr(2)O(3) were distributed at the grain boundaries or on surfaces of the LCMO grains. In resistivity versus temperature measurements, a metal-insulator transition was observed when x < 0.20. The resistivity increases and the metal-insulator transition temperature decreases with the increasing content of Cr(2)O(3). A random resistor network (RRN) model was used to simulate the transport property of the mixture samples. The simulation results agree with the experimental observations. The results show that the method is reasonable for understanding the electronic transport of the composites of the maganite.
ISSN:1000-2413