| Autor: |
N. Zhang, J. Su, Z. Y. Liu, Z. M. Fu, X. W. Wang, G. L. Song, F. G. Chang |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2014, Vol. 115 Issue 13, p133912-1-133912-7, 7p, 1 Black and White Photograph, 5 Graphs |
| Abstrakt: |
We investigate the room temperature microstructure and high temperature magnetic properties of Ca2+-substituted Bi1-xCaxFeO3 (0⩽x⩽0.2) ceramics. The Bi1-xCaxFeO3 compound transforms from rhombohedral into tetragonal structure with the phase boundary lying around x=0.1. Based on this, the magnetic modulation becomes significant and the strongest remnant magnetization Mr is obtained at x=0.1 compound. An important observation is the ferromagnetic-like phase transition revealed at TFM=878K in pure BiFeO3. The TFM of Bi1-xCaxFeO3 varies with Ca concentration and is close to the TAFM when x=0.1. The convergence between TFM and TAFM implies the severe competition between Fe3+-O2-Fe3+ and unbalanced Fe3+-O2-Fe2+ antiferromagnetic exchange interactions, which leads to the dramatic change around TAFM in the M-T curve of x=0.1 compound. The structure-related modulation of magnetic structure and complex interaction between Fe3+ and Fe2+ may be the driving force for the excellent magnetic properties of x=0.1 sample. VC 2014 AIP Publishing LLC. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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