Comments on “Investigation on novel bulk size single crystal of Glycine with metal ions grown by solution growth method for photonic applications”

Abstract

The authors of the title paper (Materials Letters 257 (2019) 126674) report to have grown a glycine potassium dichromate (GPDC) single crystal by slow evaporation of an aqueous solution containing equimolar quantities of glycine and potassium dichromate. In this comment, many points of criticism, concerning the crystal growth and experimental data for this so-called GPDC crystal are discussed to prove that it is a dubious material.