Optical properties of guanidinium aluminium sulphate hexahydrate (GASH)

Abstract

Far-infrared reflection spectra were determined, for the first time, for single crystals of guanidinium aluminium sulphate hexahydrate (GASH) and its solid solution for 5 mol.% chromium isomorph (GCSH). The infrared active transversal and associated longitudinal phonon frequency and the dielectric permittivity functions for E//C and E perpendicular to C have been determined using both Kramers-Kronig analysis and a fitting procedure based on a four-parameter model. The indices of refraction were also measured using the immersion method with Cargille liquid and the results were compared with data obtained by numerical analysis of reflectivity measurements. The optical transmission of the samples were measured in the visible range and three wide energy bands were observed at about 2.6 eV, 3 eV and 4.9 eV for GASH doped with Cr, below the conduction energy zone.

Raman and infrared spectral studies of [C(NH2)3]2MII(H2O)4(SO4)2, MII = Mn, Cd and VO

“…1 -3 Complexes of guanidinium ions have a wide range of applications such as destruction of aqueous wastes of biotic origin, rocket propellant formulations, explosives, etc. 5,6 Despite the range of applications, only a few vibrational spectroscopic studies on this family compounds have been carried out. 5,6 Despite the range of applications, only a few vibrational spectroscopic studies on this family compounds have been carried out.…”

Growth and Characterization of Non-Linear Optical Single Crystal Guanidinium triscadmium Sulphate Octahydrate

“…The crystal structure, vibrational spectroscopic studies and ferroelectric properties of some guanidinum metal sulphates have been reported in the literature [6][7][8]. Many guanidinuim based nonlinear optical crystals were grown and reported [9,10].…”

Theoretical study of electron paramagnetic resonance spectra and local structure of trigonal [Cr(H2 O)6 ]3+ complex in GASH:Cr3+ and AlCl3 · 6H2 O:Cr3+ systems at different temperatures

“…Guanidinium aluminum sulfate hexahydrate (C(NH 2 ) 3 Al(SO 4 ) 2 · 6H 2 O, GASH for short) is of significant due to its optical, ferroelectric, piezoelectric, dielectric, and other properties 1–4. It is useful for technical applications such as optoelectronic devices, semiconductor memory devices, and ferroelectric thin films.…”