TITLE:
Growth, Structural, Optical, Mechanical and Dielectric Characterization of Diammonium Hydrogen Phosphate (DAHP) Single Crystals
AUTHORS:
P. Selvarajan, N. Joseph John, C.K. Mahadevan
KEYWORDS:
Optical Materials; Solubility; Crystal Growth; XRD; hardness; dielectricconstant; SHG;
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.10 No.15,
December
20,
2011
ABSTRACT: Solubility studies of Diammonium Hydrogen Phosphate(DAHP) in de-ionized water were
performed at various temperatures in the range 30-50 °C. Single crystals of DAHP were
grown from aqueous solutions by slow evaporation technique. Structural characterization of
the grown crystals has been carried out by powder and single crystal X-ray diffraction (XRD)
methods. DAHP crystals crystallize in monoclinic structure with the space group P21/c.
Second harmonic generation (SHG) for the material of this work was confirmed using Nd:
YAG laser. The UV-Visible spectrum show that the grown crystals have wide optical
transparency in the entire visible region. The dielectric measurements were made for
grown DAHP crystal at the frequencies of 100 Hz and 1 KHz and in the temperature range
30-150 °C. Vickers microhardness value of DAHP crystal is found to increase with
increase in load. Value of density of the grown DAHP crystal has been measured and it is
well matched with the data of XRD studies.