Platelets were grown in the HgI2–HI–H2O system by solvent evaporation at constant temperature. Various solution temperatures, growth times and stirring conditions were studied. The chemistry of the system was studied in order to determine the best growth parameters. The complexes, [HgI3]− and [HgI4]−2, were identified and quantified, by means of visible and ultra-violet spectrometry, according to the R-ratio, [HgI2]/[HI]. Solution oxidation and I3− interference were avoided by growth in a high-purity Ar atmosphere. Good platelets, up to 6.0mm x 7.0mm x 1.5mm in size, were obtained by using suitable Ar flows, temperatures and growth times. The platelets were studied by means of optical microscopy, and the absence of dislocations was confirmed by studying etch-pit densities after etching with ethanol–trichloroethylene. The non-existence of occluded water and hydrocarbons was confirmed by Fourier-transform infra-red spectroscopy, and was related to results on crystals grown using the physical vapor transport method.

Growth of Mercuric Iodide Platelets for X-Ray Room Temperature Detectors in the HgI2–HI–H2O System. L.Fornaro, L.Luchini, M.Köncke, L.Mussio, E.Quagliata, K.Chattopadhyay, A.Burger: Journal of Crystal Growth, 2000, 217[3], 263-70