Comments on the paper on the multiferroic Bi(Cd0.5Ti0.5)O3-BiFeO3 solid solution written by N. Kumar et al. and published in J. Alloys Compd. 747, 895 (2018)

My comments concern the sever error in the crystallographic part of the commented paper. It was found that the studied crystal is of the sillenite type and the correct formula should be Bi25FeO39:Cd,Ti instead of some kind of solid solution based on BiFeO3. Moreover, the type of unit cell is not correct. Due to the double doping the new type of unit cell, previously unknown, was proposed for such crystals. The actual chemical composition of the studied crystals is not known.