Titanium(II) oxide

Cubic

Titaniummonoxid

Gold -colored solid

Fixed

4.95 g · cm -3

1770 ° C

3227 ° C

• Decomposition in water
• Soluble in hot hydrofluoric acid and hydrogen peroxide

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Titanium ( II) oxide is an inorganic chemical compound of titanium selected from the group of the oxides.

Occurrence

Titanium (II ) oxide occurs naturally as the mineral Hongquiit. Absorption bands of the compound was detected in the spectra of different star.

Production and representation

Titanium ( II) oxide can be obtained by reacting titanium with a titanium ( IV) oxide at 1600 ° C.

Also possible is the production by the reduction of titanium ( IV) oxide with hydrogen at 2000 ° C and a pressure of 130 atm.

Properties

Titanium (II ) oxide, gold is a yellow powder and has a considerable homogeneity range ( 0.2 - TiO1 TiO0, 85). It dissolves in dilute hydrochloric acid or sulfuric acid with partial oxidation in Ti2 H = Ti3 1/ 2 H2. It is a strong reducing agent, since it reacts readily to titanium ( IV) oxide. So it reduces water to form hydrogen.

The compound has a crystal structure of the sodium chloride type (a = 418.2 pm ). Here, about 15 % of the lattice sites remain unoccupied even with stoichiometric composition and later during heating in vacuum to 990 ° C the vacancies begin to change places randomly, so the X-ray structure analysis testify the typical scattering pattern of sodium chloride. At normal temperature, the stoichiometric compound is a metal conductor with a monoclinic crystal structure. By overlapping of the d- orbitals of the titanium ions is formed a metal strip with delocalized d electrons. Probably the oxygen vacancies facilitate the overlap. When heated in air, the compound converts to depends on the temperature to other titanium oxides. The result is at 200-250 ° C, titanium ( III) oxide and 350 ° C, titanium (IV ) oxide.

Use

Titanium ( II) oxide is used in electrochromic systems.