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Electrical transport behavior of La0.67Ca0.33MnO3/Fe3O4 composites

โœ Scribed by Z.C. Xia; S.L. Yuan; W. Feng; L.J. Zhang; G.H. Zhang; J. Tang; L. Cheng; Q.H. Zheng; L. Liu; S. Liu; C.Q. Tang

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
405 KB
Volume
126
Category
Article
ISSN
0038-1098

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โœฆ Synopsis

The influence of Fe 3 O 4 contents on the electrical transport properties (resistivity and ac susceptibility) of a series of composite samples of La 0.67 Ca 0.33 MnO 3 /Fe 3 O 4 is studied. Results show that the Fe 3 O 4 phase not only shifts the intrinsic insulator -metal (I-M) transition temperature T P1 to a lower temperature, but also causes a new I -M transition at a lower temperature T P2 รฐT P2 , T P1 รž: On the basis of an analysis by scanning electron microscopy and X-ray diffraction, we suggest that the decrease of the I -M transition temperature and the formation of the new I -M transition are caused by the segregation of a new phases related to the Fe 3 O 4 at grain boundaries or surfaces of the La 0.67 Ca 0.33 MnO 3 grains.

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