Nonmagnetic Fe-site doping of BiFeO3 multiferroic ceramics

Jie Wei; Haumont, Raphael; Jarrier, Romain; Berhtet, Patrik; Dkhil, Brahim
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p102509
Academic Journal
In this paper, we show that a pure single phase by doping Fe-site of BiFeO3 (BFO) using tetravalent Zr4+ ions can be achieved by introducing cation (Bi3+) vacancies. The structural analysis reveals that the ferroelectric nature of BFO should be weakly affected by 10% of Zr4+ doping as the c/a ratio and the Curie temperature TC remain roughly unchanged compared to that of pure BFO. In contrast, the magnetic properties are affected as a weak ferromagnetism and a change of Néel temperature TN are observed. Beyond the double-exchange interactions arising from the creation of Fe2+, we propose another simple model inducing a local ferromagnetic coupling rather than an antiferromagnetic which considers the replacement of the magnetically active Fe3+, time to time, by a nonactive Zr4+.


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