Dielectric and Optical Characterization of Boron Doped Ammonium Dihydrogen Phosphate

Abstract

Single crystals of pure and boron doped ammonium dihydrogen phosphate were grown from aqueous solution by slow solvent evaporation process. ICP studies were done to confirm the presence of the dopant boron in the parent crystal. The values of the lattice parameters were determined by single crystal X-ray diffraction. The pure and doped ADP crystals were found to have tetragonal structure. Complete optical characterizations of the crystals were done using the FTIR, UV-Vis and NLO studies. The presences of the various functional groups in the crystals were identified by FTIR spectrum. The band gap energies of the pure and doped crystals have been calculated at their cut off frequencies using the UV-Vis spectrum. The second harmonic generation efficiency of the crystals was determined. The electric properties of the grown crystal have been analyzed by studying the variation of dielectric constant and dielectric loss with frequency.

Effect of Dicarboxylic Acid Dopant on ADP Crystal by Slow Evaporation Method

“…4. The lower cut of wavelength is found to be 384 nm which is consistent with literature value [13]. The optical transmittance in bulk crystal medium is facilitated by optically active functional units and scattering/absorption of light due to defect centers [16].…”

“…The N-H bending vibrations are assigned to weak band at 1648 cm −1 . The peak at 913 cm −1 indicates the O-H vibration [13]. The presence of band 1404 cm −1 is due to bending vibration of ammonium.…”

“…The observed low absorption offered by ADFU crystal reveals the presence of high optical homogeneity and lesser defects. Literature survey reveals that if the UV-Vis spectrum exhibits minimum absorbance then the possibility of that crystal is NLO active is high [13]. From the knowledge of absorption coefficient and photon energy, the band gap Eg can be estimated as 2.5eV respectively.…”

Chemical, Thermal, and Spectroscopic Analysis of Organomineral Fertilizer Residue Recovered from an Oxisol

“…The peaks in the 546 and 1068 cm –1 regions (PO 4 3– vibrations) and at 1099 cm –1 (POH vibration), 1135 and 1200 cm –1 (P=O stretching), and 577 cm –1 (phosphate acids) were present in OG, OM, and MM and are related to phosphate group vibrations (Mazeika et al, 2016a; Ramakrishnan and Aruldhas, 1988; Jegatheesan et al, 2012; Renganayaki et al, 2012; Zion et al, 2013; Hudson et al, 2014; Sheikh et al, 2016; Muthuselvi et al, 2016). These phosphate groups were present in all fertilizers because of the presence of MAP in their formulations.…”

“…The peak at 1400 cm –1 represents the N–H vibrations characteristic of the ammonium from MAP (Jegatheesan et al, 2012; Renganayaki et al, 2012; Zion et al, 2013; Hudson et al, 2014; Parfitt et al, 1976) and it was present in only OG, OM, and MM. The spectra of OGr, OMr, and MMr exhibited band displacement from 1400 to 1384 cm –1 .…”