2. Properties of titanium oxide

2.1 Physical properties

Titanium dioxide (TiO ₂ ) is a thermally stable white solid inorganic substance, non-flammable and sparingly soluble in usual solutions. The main physical properties of titanium dioxide are as follows:

• molar mass: 79.8658 g.mol ^–1 ;

• melting temperature: 1,855 °C ;

• boiling temperature: 2,500-3,000°C ;

• Mohs hardness: anatase 5.5-6; rutile 6-7 ;

• average relative dielectric permittivity: anatase 45; rutile 127 ;

• refractive index in air: anatase 2.55; rutile 2.75....