The parameters of the crystalline elementary cells were calculated starting from the diffraction X-ray spectra obtained on microcrystalline powders of compounds with thermocbromic and semiconductor properties. The respective cell units belong to the tetragonal system and have the following values: a=6.450 A, c=1.14 A for the Tl2HgI4 compound; a=6.875 A, c=13.110 A for the PbHgI4 compound; a=6.40 A, c=13.12 A for the Au2HgI4 compound. The wet synthesis method is described for the CdHgI4 compounds.
In this paper the structural changes of the MXHgI4 -type combinations (M =Ag+, Cu+, Tl+, Pb+2, Cd2+ and x = 1,2) which occur due to pressure (5 -30 MPa) applied on the powder of these complexes are presented. These alterations were confirmed by the X-ray diffraction spectra and by electrital conductibility measurements.
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