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Chemical compound
Thallium(I) bromide is a chemical compound of thallium and bromine with a chemical formula TlBr. This salt is used in room-temperature detectors of X-rays, gamma-rays and blue light, as well as in near-infrared optics.
It is a semiconductor with a band gap of 2.68 eV.
The crystalline structure is of cubic CsCl type at room temperature, but it lowers to the orthorhombic thallium iodide type upon cooling, the transition temperature being likely affected by the impurities. Nanometer-thin TlBr films grown on LiF, NaCl or KBr substrates exhibit a rocksalt structure.
Like all soluble thallium salts, thallium bromide is extremely toxic and a cumulative poison which can be absorbed through the skin. Acute and chronic effects of ingesting thallium compounds include fatigue, limb pain, peripheral neuritis, joint pain, loss of hair, diarrhea, vomiting, vision loss, and damage to central nervous system, liver and kidneys.
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