Enhanced optical, NLO, dielectric and thermal properties of novel sodium hydrogen phthalate single crystals doped with zinc

Pure and zinc doped sodium phthalate (SP and ZSP) non-linear optical crystals have been grown by slow evaporation solution technique (SEST) at room temperature. Doped crystals exhibit prominent morphological changes (hexagon to pentagon) in different crystallographic planes. XRD revealed that metallic dopant (Zn) did not change the basic structure of the parent crystal. The presence of various functional groups and chemical bonding present in the crystals was identified and assigned qualitatively by Fourier transform infrared (FTIR) and Raman analysis. UV–Vis studies indicate the low percentage of absorption in doped crystals in the visible region, thereby confirming the enhancement of non-linear optical (NLO) property. Second harmonic generation efficiency also gets enhanced as a result of metal ion zinc doping. Dielectric analysis reveals that on zinc doping dielectric constant and loss decreases significantly. In thermal analysis, the melting point and thermal stability of the SP crystals has been found to increase as a result of Zn doping.

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► Pure and Zn doped SP single crystals have been grown by slow evaporation method.
► Vibrational bands were analyzed by FTIR and Raman spectra.
► Optical band gap and transparency of SP crystals increased in UV analysis.
► Dielectric constant decreases while melting point & SHG efficiency increases.
► Zn doping enhances the optical applications of SP crystals.