Abstract
Ba(Fe0.5Ta0.5)O3 ceramics with a cubic crystal structure in space group (2 2 1) were prepared by a solid-state reaction process, and the magnetic characteristics were evaluated systematically. Ba(Fe0.5Ta0.5)O3 was antiferromagnetic with a slight ferromagnetic moment below 20 K, and above this temperature a weak ferromagnetic nature was revealed. To clarify the origin of the magnetic behaviour, the crystal structure and the magnetic characteristics of Al-substituted Ba(Fe0.5Ta0.5)O3 ceramics were investigated, and the weakened ferromagnetic ordering was revealed compared with the pure Ba(Fe0.5Ta0.5)O3 ceramics. The 57Fe Mössbauer spectra at room temperature showed that iron was the centre paramagnetic doublet in both pure Ba(Fe0.5Ta0.5)O3 and Al-substituted Ba(Fe0.5Ta0.5)O3 ceramics, and the reduction in Fe2+ was detected in Al-substituted Ba(Fe0.5Ta0.5)O3 ceramics. These analytical results suggested that oxygen vacancies appeared to play an important role in the room temperature ferromagnetism in Ba(Fe0.5Ta0.5)O3 ceramics. Although the antiferromagnetism has been reported previously, the weak ferromagnetic nature at room temperature had never been observed before.
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