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My comments concern the errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed. The crystal structure was not presented in the commented paper. • Correction of erroneous analysis of diffraction patterns. • Comparison of unit cells relation to the content of Ca dopant. • The crystal structure was not given in the commented paper. [ABSTRACT FROM AUTHOR]

My comments concern the significant error in the crystallographic part of the commented papers. It was discovered that the studied nanocrystals are of sillenite type and the correct formula should be Bi 25 FeO 39 :Co,Ti and Bi 25 FeO 39 :Ni,Ti instead of BiFeO 3. Moreover, the type of unit cell is not correct. Due to the doping the new type of unit cell, previously unknown, was proposed for such crystals. It was found that the studied sample contains two slightly different phases of the sillenite type. The actual chemical composition of the studied crystals is not known. [ABSTRACT FROM AUTHOR]

My comments concern the severe errors in the crystallographic part of the commented paper. The actual composition of the studied crystals is not known, but the diffraction patterns and Rietveld analysis suggest the chemical formula to be Ba 2 Sr(VO 4)(FeO 4) instead of BaSrFeVO 6. Moreover, the symmetry should be trigonal. [ABSTRACT FROM AUTHOR]

My comments concern the errors in the crystallographic part of the commented paper. [ABSTRACT FROM AUTHOR]

Highlights • Several errors were found and corrected. • All corrections concern the crystallographic part of paper. • Due to the overlapping of Bragg peaks the crystallite size is not correctly calculated. Abstract The commented paper presents the results on structural and optical studies on the nanocrystals of SrAl2O4:Eu. Unfortunately, there are mistakes in the analysis of diffraction patterns in this paper which should be corrected to avoid its use in the future papers by Authors and by other people. [ABSTRACT FROM AUTHOR]