Tellurium Dioxide
Title: Tellurium Dioxide
CAS Registry Number: 7446-07-3
CAS Name: Tellurium oxide (TeO2)
Molecular Formula: O2Te
Molecular Weight: 159.60
Percent Composition: O 20.05%, Te 79.95%
Line Formula: TeO2
Literature References: Prepd by oxidation of Te by HNO3: Norris, J. Am. Chem. Soc. 28, 1675 (1906); Marshall, Inorg. Synth. 3, 143 (1950); Fehér in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 447-449. The orthorhombic form occurs in nature as the mineral tellurite. Review: Dutton, Cooper, Chem. Rev. 66, 657-675 (1966).
Properties: White crystals, dimorphic: tetragonal, d 5.75; orthorhombic, d 6.04. Turns yellow on heating, mp 733°, forming a deep yellow liquid. Soly in water about 1:150,000. Sol in sodium hydroxide solns and in hydrochloric acid. Practically insol in ammonia water.
Melting point: mp 733°
Density: d 5.75; d 6.04

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