Cuprous Mercuric Iodide

Title: Cuprous Mercuric Iodide
CAS Registry Number: 13876-85-2
CAS Name: (T-4)-Dicopper(1+) tetraiodomercurate(2-)
Additional Names: copper(I) iodomercurate(II); cuprous tetraiodomercurate(II); mercuric cuprous iodide
Molecular Formula: Cu2HgI4
Molecular Weight: 835.30
Percent Composition: Cu 15.22%, Hg 24.01%, I 60.77%
Literature References: Superionic, thermochromic material; exists in two temperature dependent forms; a structurally ordered low temperature b-form and the more random high temperature a-form. Prepn and structural studies: J. A. A. Ketelaar, Z. Kristallogr. 80, 190 (1931). Prepn and phase diagram: M. Friesel et al., Physica Scripta 35, 34 (1987); J. Nölting et al., Ber. Bunsen-Ges. Phys. Chem. 93, 1335 (1989). Optical properties: H.-R. C. Jaw et al., Inorg. Chem. 26, 1387 (1987). Crystal structure and phase transition studies: L. Eriksson et al., Z. Kristallogr. 197, 235 (1991). High temperature powder neutron diffraction studies: S. Hull, D. A. Keen, J. Phys. Condens. Matter 13, 5597 (2001). Use in holography: J. M. Yang, D. W. Sweeney, Appl. Optics 18, 2398 (1979); in titrimetric applications: O. E. S. Godinho et al., Anal. Lett. 17, 135 (1984).
Properties: Deep-red, thermochromic cryst powder. Changes from scarlet to chocolate-brown at 67°. Poison! Practically insol in water, alcohol.
Use: For detecting overheating of machine bearings, etc. In pigments to prepare paints. Recording material for infrared holograms. Analytical reagent in titrimetric determn.
Cuprous Oxide Cuprous Potassium Cyanide Cuprous Selenide Cuprous Sulfide Cuprous Sulfite