Comments on “Investigation on synthesis, laser damage threshold, and NLO properties of l-asparagine thioacetamide single crystal for photonic device applications” [J Mater Sci: Mater Electron. 31, 13310–13320 (2020)

Abstract

The authors of the title paper [J. Mater. Sci. Mater. Electron. 31, 13310–13320 (2020)] report to have grown a so-called l-asparagine thioacetamide (LATA) single crystal by slow evaporation of an aqueous solution containing l-asparagine monohydrate and thioacetamide in 1:1 ratio. The same research group has claimed in another paper [J. Mater. Sci. Mater. Electron. 31, 791–798 (2020)] to have grown a so-called NLO-active potassium hydrogen phthalate fumaric acid crystal (KHPF). In this comment we prove that LATA and KHPF are improperly characterized crystals and both papers are erroneous.