Because of its broad range of functional applications,numerous kinds of perovskite-structured ceramics have been widely studied. However, the properties of barium iron tantalate, Ba(Fe1/2Ta1/2)O3 (BFT),which has a perovskite structure is not well known
and only few studies have been performed. In the late 1950s, Galasso et al. reported that the crystal structure of BFT is cubic perovskite and the lattice parameter is about a = 4.056A ° .An interesting pheno menonuoted in the paper is that the BFT showed ferroelectric properties even though it has a cubic perovskite structure. On the other hand, an ambiguous
dielectric characteristic of BFT was reported by Agranovskaya
[2] representing only a large dielectric loss
tangent above 1 with no further explanation. Later,
more detail crystal structure analyses in BFT showed
that it had a cubic symmetry that can not possess
ferroelectric properties