Growth and Characterization of ADP Single Crystal

Abstract

Ammonium dihydrogen phosphate (ADP) (NH 4 H 2 PO 4 ) single crystals were grown by gel method using sodium metasilicate (SMS). The X-ray diffraction analysis of the as-grown ADP crystals showed that it possess tetragonal structure having lattice parameters a = 7.502 °A and c = 7.554 °A. The Fourier transform infrared spectroscopy (FTIR) of as-grown ADP crystal taken between wave-number 400 to 4000 cm -1 showed peaks due to vibration and stretching of functional group O-N=P and -ONO 2 in 485 to 902 cm -1 , P=O and O-H in 1076 to 1544 cm -1 and O-H and N-H in 2400 to 3371 cm -1 range. The UV-Vis-NIR spectroscopy of ADP crystal showed direct optical bandgap of 4.99eV and indirect optical bandgap of 4.12eV. The optical microscopy employed to study the surface microstructure showed hillocks on the as-grown surfaces arising due to local increased supersaturation. The thermal properties of the as-grown ADP crystals were studied by thermogravimetric analysis (TGA). The thermal activation energy determined from the TGA curve using Broido, Piloyan-Novikova (PN) and Coats Redfern (CR) relations were in good agreement with each other. The obtained results are discussed in details.

Effect of crystal violet dye on the structural, optical, mechanical and piezoelectric properties of ADP single crystal

“…All observed vibrational bands agrees well with the earlier reported works [5,11,33], which confirms the formation of various functional groups in ADP crystal. The vibrational band assignments for pure and dye doped ADP crystal are presented in Table 2.…”

“…These crystals continue to be an important material for researchers both industrially and academically because of their unique NLO, piezoelectric, electro-optic and antiferroelectric (at low temperature) properties. ADP crystallizes in tetragonal crystal system with I-42d space group and its unit cell parameters are a = b = 7.4979 Å and c = 7.5393 Å [11]. Recently extensive research has been carried out on the growth and characterization of ADP doped with organic and inorganic dopants [12][13][14][15].…”

Novel water‐soluble polymer coatings controlNPKrelease rate, improve soil quality and maize productivity

“…[49][50][51][52] Likewise, the band appeared at 1456 and 1153 cm À1 is attributed to P─OH and P═O stretching vibrations and a peak at 1076 cm À1 is attributed to the HO─P─OH bending vibration. [53][54][55] ). The more eminent peaks were observed in the range of 22 -30 .…”

Phase Transition Dielectric Properties in Order-disorder Antiferroelectric NH4(H2PO4) (ADP) Crystal

“…Rajesh et al 25 have studied the effect of Ni 2+ ion on the structural, optical, thermal and dielectric properties of ADP single crystals by a slow evaporation method. Chaki et al 26 studied the growth and characterization of ammonium dihydrogen phosphate single crystal grown by gel method. Jegatheesan et al 27 have studied the FTIR, XRD, SEM and TGA investigations of ADP single crystal.…”