Growth, nonlinear optical, thermal, dielectric and laser damage threshold studies of semiorganic crystal: Monohydrate piperazine hydrogen phosphate

Monohydrate piperazine hydrogen phosphate (MPHP), a semi organic nonlinear optical material has been synthesized and single crystals were grown from aqueous solution by slow evaporation technique. Single crystal X-ray diffraction study on grown crystal reveals that they belong to monoclinic crystal system with space group P21/c; (a = 6.39 Å; b = 12.22 Å; c = 11.16 Å; β = 97.14°; V = 864 Å3). The structural perfection of the grown crystal was analyzed by high-resolution X-ray diffraction (HRXRD) rocking curve measurements. FTIR spectrum confirms the presence of the functional groups in synthesized material. UV–Vis spectrum indicates that the crystal is transparent in the entire visible region with a lower cut off wavelength of 387 nm. The variation of dielectric properties of the grown crystal with respect to frequency has been investigated at different temperatures. Thermal analysis carried out on the MPHP crystal shows that the crystal is stable up to 135 °C. Relative powder second harmonic generation efficiency tested by Kurtz–Perry powder technique, which was about 0.638 times that of Potassium dihydrogen phosphate.

Figure optionsDownload as PowerPoint slideHighlights
► The lower cut off wavelength of the crystal is found to be 378 nm.
► SHG efficiency is 0.638 times that of KDP.
► The MPHP crystal exhibits higher laser damage threshold value than Urea and KDP.
► The crystal is thermally stable up to 135 °C.