Mercury(II) iodide is a semiconductor material, ill-used incoming close to X-ray photograph and gamma beam of light espial and imaging devices operating at room temperatures. In medicine, mercury(II) iodide was formerly employed every bit a discourse for syphilis (attend Protiodide).In veterinary medicine, mercury(II) iodide equals ill-used in blister ointments in exostoses, bursal enlargement, etc. Mercury(II) iodide is used for preparation of Nessler's reagent, used for detection of presence of ammonia.
When red-orange Mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126oC to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
Mercury (II) iodide below 126oC is red/orange in color. This is referred to as the alpha form. Mercury (II) iodide is a thermochromic compound. That is, its color changes as heat is applied. The color change is due to a change in crystal structure. At temperatures above 126oC, mercury (II) iodide exists in its beta form, which is pale yellow.
Mercury(II) iodide can be found extremely rarely in nature as mineral coccinite.
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