title: Structural, spectroscopic, optical, dielectric and mechanical study of pure and l-Proline doped ammonium dihydrogen phosphate single crystals.
abstract: Single crystals of pure and l-Proline (LP) C5H9NO2 doped ammonium dihydrogen phosphate (ADP) (NH4) H2PO4 were grown by slow evaporation solution technique (SEST) at ambient conditions. Powder X-ray diffraction (PXRD) analysis was carried out to confirm the crystal structure and no additional phase was observed due to doping except a systematic variation in peak intensities. FT-Raman analysis also confirms that there is no additional phase formation due to doping. Fourier transform infrared spectral analysis was done to examine the presence of various functional groups in the grown crystals. UV-VIS-NIR spectroscopic analysis was carried out to see the change in optical transparency of pure ADP and crystals due to LP with different doping concentrations. The high-resolution X-ray diffraction (HRXRD) analysis was carried out to examine the crystalline perfection and observed reasonable changes with LP doping. Second harmonic generation (SHG) efficiency measurement was done to examine the enhancement in the nonlinear optical characteristics of the grown crystals. The dielectric behavior of the samples shows that the dielectric constant decreased with increase the value of frequency. The effect of LP dopant on crystal morphology, mechanical properties of ADP has also been presented in this paper. The above studies reveal the effect of incorporation of LP into the lattice of ADP crystals.
authors.affiliation: Crystal Growth Laboratory, Dept. of Physics, Jamia Millia Islamia, New Delhi 110 025, India.
authors.forename: Mohd
authors.initials: M
authors.lastname: Hasmuddin
authors.affiliation: Crystal Growth Laboratory, Dept. of Physics, Jamia Millia Islamia, New Delhi 110 025, India.
authors.forename: Preeti
authors.initials: P
authors.lastname: Singh
authors.affiliation: Crystal Growth Laboratory, Dept. of Physics, Jamia Millia Islamia, New Delhi 110 025, India; Department of Physics, School of Science, King Khalid University, P.O. Box. 9004, Abha 61413, Saudi Arabia.
authors.forename: Mohd
authors.initials: M
authors.lastname: Shkir
authors.affiliation: Crystal Growth Laboratory, Dept. of Physics, Jamia Millia Islamia, New Delhi 110 025, India; Promising Centre for Sensors and Electronic Devices (PCSED), Department of Physics, College of Science and Arts, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia.
authors.forename: M M
authors.initials: MM
authors.lastname: Abdullah
authors.affiliation: CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India.
authors.forename: N
authors.initials: N
authors.lastname: Vijayan
authors.affiliation: CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India.
authors.forename: G
authors.initials: G
authors.lastname: Bhagavannarayana
authors.affiliation: Crystal Growth Laboratory, Dept. of Physics, Jamia Millia Islamia, New Delhi 110 025, India. Electronic address: mwahab@jmi.ac.in.
authors.forename: M A
authors.initials: MA
authors.lastname: Wahab
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D010710:Phosphates / Q000737:chemistry*; D011392:Proline / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D010710:Phosphates; C024788:ammonium phosphate; D011392:Proline
keywords: Dielectric study; HR-XRD; Optical study; Solution growth; Vibrational study