Оксид титана (Ti3O5)

Description

Titanium oxide Ti3O5 (trititanium pentoxide) is an intermediate titanium oxide from the Magneli phase series, occupying a position between titanium dioxide TiO2 and dititanium trioxide Ti2O3. Supplied in the form of black granules.

Basic Attributes

• CAS No.: 12065-65-5
• Chemical formula: O,Ti (Ti3O5 according to product nomenclature)
• English name: Titanium oxide (Ti3O5)
• Molecular weight: 223.6
• Exact weight: 223.81800
• EU number: 236-675-5
• HS code: 2823000000
• PSA specifications: 77.51000
• XLogP3: -0.54360

Physico-chemical characteristics

• Appearance: black granule
• Density: 4.2
• Melting point: 1800 °C
• Solubility: soluble in hot concentrated sulfuric acid, hydrofluoric acid and alkali

Scope of application

Titanium oxide Ti3O5 is used as an evaporated material for the deposition of optical thin-film coatings using the vacuum deposition method - it provides a high refractive index of the layer, and is used in the manufacture of antireflective and beam-splitting optical coatings, mirrors and filters. In materials science, it is studied as a phase with a reversible photoinduced phase transition between low-temperature and high-temperature crystalline modifications, making the compound a promising material for thermal energy storage devices and light-switchable functional coatings.

Storage and transportation

Store in a dry, well-ventilated area, in a tightly closed container. The material is resistant to water, but dissolves in hot concentrated sulfuric acid, hydrofluoric acid and alkalis - contact with these reagents during storage is excluded.

Place in the series of titanium oxides

Titanium oxides form a series of intermediate phases between TiO2 (dioxide, the most oxidized and abundant form) and Ti2O3 (sesquioxide, the most reduced stable form). Ti3O5 occupies an intermediate position in the degree of oxidation of titanium and, unlike TiO2, has a black color and noticeably higher electrical conductivity, which determines its specific applications that differ from conventional titanium dioxide.

Phase modifications

Several crystalline modifications of Ti3O5 are known, differing in their transition temperature and electronic structure. A low-temperature modification is capable of irreversibly or reversibly transforming into a high-temperature modification under the influence of pressure, temperature or irradiation with light of a certain wavelength, which underlies research interest in the material as a functional substance switchable by external influences.

Optical Application

In the production of optical coatings, Ti3O5 granules are loaded into the crucible of an electron beam or thermal vacuum deposition installation; when evaporated, the material forms a dense, highly refractive film, used in alternating layers of antireflective coatings along with low refractive index oxides (for example, silicon dioxide).

Quality control

When accepting a batch, check the uniformity of the black color of the granules, the absence of grayish or whitish inclusions (a sign of the admixture of under-reduced TiO2 or other Magneli phases) and compliance with the declared density of 4.2 - deviations indicate a violation of the phase composition of the batch.

Material handling

Ti3O5 granules are stable in air at room temperature and do not require a protective atmosphere during storage. When used in vacuum deposition, the evaporated material is loaded into the evaporator crucible without prior preparation; When working with concentrated acids and alkalis in which the material dissolves, skin and eye protection is used.