Synthesis, growth and characterizations of picric acid mixed potassium hydrogen phthalate single crystal for non linear optical applications

• DOI: 10.1007/s10854-021-06580-4
• Publication Date: 2021-07-22T05:09:31Z
• Authors: R. Arul Jothi; S. Vetrivel; S. Gopinath; R. U. Mullai; J. Johnson; E. Vinoth
• Keywords: Monoclinic crystal system; Picrate; Picric acid; Crystal (programming language); Thermogravimetric analysis

Potassium hydrogen phthalate picrate (KHPP) was harvested by solution growth method at room temperature. The KHPP crystal system was identified monoclinic with the cell parameters, a = 5.08 A, b = 14.33 A, and c = 9.62 A by the single-crystal XRD study. The PXRD study ensures the KHPP crystal as in good crystalline nature. The FTIR spectrum confirms the various modes of functional groups available in the prepared KHPP sample. The linear optical study in UV–Vis–NIR region reveals that the sample possesses optical window between 282 and 1100 nm wavelength with band-gap energy 4.83 eV. The thermogravimetric and differential thermal analysis shows that the grown crystal has thermally stable upto 199.90 °C. The hard nature of the KHPP crystal was identified by the Vickers hardness study. The nonlinear optical study shows that the SHG efficiency is 1.72 times grater than that of KDP. This result indicated the suitability of the sample for nonlinear optical (NLO) applications.