Comments on the paper "Structural, dielectric, electrical and optical properties of a double perovskite: BaNaFeWO6 for some device applications" by S. Mishra, R.N.P. Choudhary, S.K. Parida, and published in Journal of Molecular Structure 1265 (2022) 133353

• It is shown that the commented paper has severe errors. • The analysis of the diffraction pattern was made without success. • The chemical composition of the studied crystals is unknown. My comments concern the errors in the crystallographic part of the commented paper. Moreover, the true chemical composition of the studied sample is different than BaNaFeWO 6 as proposed by authors. Therefore, the subsequent data on other measurements may have no scientific value. [ABSTRACT FROM AUTHOR]