Uranium Peroxide
Title: Uranium Peroxide
CAS Registry Number: 12036-71-4
Molecular Formula: O4U
Molecular Weight: 302.03
Percent Composition: O 21.19%, U 78.81%
Line Formula: UO4
Literature References: Exists as a di- or tetrahydrate. Prepd from UO2(NO3)2.6H2O: Watt et al., J. Am. Chem. Soc. 72, 3341 (1950); Boggs, El-Chehabi, ibid. 79, 4258 (1957); Sato, J. Appl. Chem. 13, 361 (1963).
Derivative Type: Dihydrate
Properties: Hygroscopic, pale yellow crystals. Dec slowly in the temp range 90-195° to form a different peroxide U2O7, an orange, hygroscopic solid which dec to UO3 and oxygen on contact with water, and to uranyl salts and oxygen on contact with acids. At temps of 200° and above, the dec of UO4.2H2O leads to UO3 without the formation of U2O7.
Status: This monograph has been retired and is no longer subject to revision or update.

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