Comments on the paper on the properties of Ca-doped BaFe0.5Nb0.5O3 by R. Chakravarty et al., and published in Applied Physics A 128, 647 (2022)

My comments concern some errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed and the final data on the structure (symmetry and unit cell parameters) are different than those supposed in the paper.