Growth of mercuric iodide platelets for X-ray room temperature detectors in the HgI2 HI H2O system

CRISTALOGRAFIA

BIBLIOGRAFIA NACIONAL QUIMICA

2000

Mercuric iodide platelets were grown in the HgI 2 }HI}H 2 O system by solvent evaporation at constant temperature. Di!erent solution temperatures, growing times and stirring conditions were studied. In order to determine the best growing parameters the chemistry of the HgI 2 }HI}H 2 O system was studied. Complexes [HgI 3 ]~ and [HgI 4 ]~2 were identi"ed and quanti"ed in the solution by visible and UV spectrometry, according to the R ratio ([HgI 2 ]/[HI]). Solution oxidation and I~3 interference were eliminated performing growth in high purity Argon atmosphere. Good mercuric iodide platelets, up to 6.0]7.0]1.5mm3 in size, were obtained with appropriate argon #ow, temperature and growing time, for several independent experiences. Platelets were observed by optical microscopy and the absence of possible dislocations was con"rmed by studying etch pits density after etching with ethanol}trichloroethylene. Nonexistence of occluded water and hydrocarbons was con"rmed by Fourier transform infrared spectroscopy and was related to results obtained for mercuric iodide crystals grown by the physical vapor transport method. Detectors were made with the platelets and their apparent resistivity, current density and X-ray performance were measured. Discussions about future improvements of growing mercuric iodide platelets in the HgI 2 }HI}H 2 O system and comparison of this method with others are included.

Elsevier Science B.V

2000

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DOI:10.1016/S0022-0248(00)00461-9