In such a way the resulting 3D framework forms large tunnels, parallel to the direction, where the NH4+ ions are 18 located. These chains are linked to each other by ErO8 polyhedra through common corners. Its structure is characterized by PO4 phosphate groups which are assembled through common 15 vertices to form (PO3)n spiral chains running along the direction. Single crystals of NH4Er(PO3)4 polyphosphate have been prepared by the flux method and its structural and physical properties have been investigated. The second harmonic generation (SHG) efficiency of Nd:YAG laser was evaluated by the Kurtz and Parry method for the doped samples, it was found to be slightly lesser than that of the pure ADP crystals. Also, various linear optical parameters were evaluated for pure and doped crystals using UV-Vis spectroscopy. The dielectric study was carried out at room temperature in the frequency range from 100 Hz to 1 MHz. TGA indicated slightly less thermal stability of the doped crystals compared to the pure ADP. The EPR spectroscopy also confirmed the presence of cobalt in the doped samples. The FTIR spectra confirmed the presence of various functional groups and EDAX gave the estimation of Co and S elements. The powder XRD patterns showed the single phase nature of the doped crystals. The nanoparticle sample exhibited finite solubility in water and was used to dope in ADP crystals. To increase the solubility of CoS in water, its nanoparticles were synthesized by wet chemical technique using ethylene diamine as the capping agent followed by microwave irradiation. As ammonium dihydrogen phosphate (ADP) is a popular nonlinear optical crystal, to engineer its linear and nonlinear optical properties, the chalcogenide compound cobalt sulphide (CoS) was doped and the crystals were grown by the slow solvent evaporation method.
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