8531. Silver Tetraiodomercurate(II)

Nomenclature

CAS number: 7784-03-4
Mercuric silver iodide.
Ag2HgI4; mol wt 923.94.
Ag 23.35%, Hg 21.71%, I 54.94%.

Properties

Deep yellow thermochromic powder. Insol in water or dil acids; sol in solns of alkali iodides or cyanides.

Use

Thermal sensor to detect overheating in journal bearings, etc., becomes blood-red at 40-50° and yellow again on cooling.