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Ba(Fe$_{1/2}$Nb$_{1/2}$)O$_3$ (BFN) ceramics are considered to be promisingfor technological applications owing to their high dielectric constant over awide range of temperatures. However, there exists considerable discrepancy overthe structural details. We address this discrepancy through a combined x-raydiffraction at room temperature and neutron powder diffraction measurements inthe range from 5K up to room temperature, supplemented by a comparativeanalysis of the earlier reported structures. Our study reveals a cubicstructure with space group Pm$\bar{3}$m at all measured temperatures. Further,the x-ray near edge structure and the extended x-ray absorption fine structurestudies on the local environment of the Fe ions is consistent with the cubicsymmetry. An appropriate value of $U$ for DFT+$U$ calculations is obtained bycomparison with x-ray absorption spectroscopy, which agrees well with theearlier reported electronic properties.

Revised crystal structure and electronic properties of high dielectric Ba(Fe$_{1/2}$Nb$_{1/2}$)O$_{3}$ ceramics