Osmium dioxide

Osmiumdioxid

Black solid

Fixed

11.4 g · cm -3

650 ° C ( decomposition)

Attention

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Osmium ( IV) oxide is an inorganic chemical compound of osmium from the group of oxides.

Production and representation

Osmium ( IV) oxide can be obtained at high temperatures by the reduction of osmium tetroxide in a hydrogen-nitrogen gas stream, or by reaction of Kaliumhexachloroosmat K2OsCl6 with sodium carbonate.

Properties

Osmium ( IV) oxide is a black solid which is insoluble in water. It goes to air slowly in osmium tetroxide over pyrophoric and can react with atmospheric oxygen. It has a crystal structure of rutile type (A = 451 pm, c = 319 pm ). The dihydrate is a deep black powder which tends to osmium tetroxide as the anhydrate formation in air. In hydrochloric acid is soluble to Dihydrogenhexachloroosmat H2 [ OsCl6 ].