Ammonium dihydrogen phosphate (NH4HPO4, ADP) is an excellent inorganic nonlinear optical material with different device applications. The present work is based on the pure ADP crystals that is successfully grown from aqueous solution by slow evaporation technique at room temperature. The grown crystals are subjected to various characterizations like XRD, and dielectric studies. The crystalline nature and tetragonal structure of the grown crystals having lattice parameters are observed by powder X‐ray diffraction analysis. The dielectric properties such as dielectric constant and dielectric loss for the crystals at different areas are studied as a function of frequency in the range 50 kHz to 5 MHz at room temperature. It is found that the dielectric permittivity decreased exponentially at lower frequency region up to 1 kHz and then the dielectric permittivity remains constant at higher frequency region as the frequency increased. It is observed that as area of ADP crystal increases the dielectric constant increases and for area of 42 mm2 the dielectric constant value is high among all the different areas of ADP crystals.
Polyaniline is equipped by in-situ chemical oxidative polymerization method using ammonium persulphate as an oxidizing agent. The prepared Polyaniline is doped with the nano particles of WO3 at dissimilar weight percentage. The nano-compsites are characterized using XRD and SEM. The crystallite sizes are obtainvia Debye-Scherer relation from the XRD spectra for nano-composites of different weight percentages. The crystallite sizes of nano-particles decreased with increase in weight percentage of WO3 with the PANI. The dislocation density due to the defects in the crystals of nano-composites is obtained. The dislocation density increased as wt % of WO3 in PANI increased. Further, the strain produce at the grain boundary is obtained by FWHM of the XRD spectra. The strain of nano-composites at the grain boundary increased as dislocation density increased. Strain at the grain boundary is also increased as weight percent of WO3 increased in the nano-composites of PANI. Further, the surface morphology of the nano-composites of PANI/WO3 at different weight percentages were observed using SEM. The particles are appeared granular in shape and size. The agglomeration in the sizes of the nano-composites was observed as weight percent of WO3 with PANI increased.
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