Dielectric constant
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Because of its high dielectric constant, titanium dioxide pigment has excellent electrical properties. In the determination of some physical properties of titanium dioxide, the crystallization direction should be considered. For example, the permittivity of rutile type titanium dioxide pigment varies with the direction of the crystal. When it is parallel to the C axis, the measured dielectric constant is 180, and it is 90 when it is at a right angle to this axis. The average value of the powder is 114. The permittivity of anatase type is relatively low, which is only 48.
Conductivity
Titanium dioxide has the properties of a semiconductor. And its conductivity increases rapidly with temperature rise. Rutile titanium dioxide pigment is still an electric insulator at 20&#;. But when heated to 420&#;, its electrical conductivity increases by a factor of 107. Slightly reducing the oxygen content will have a special affect on its electrical conductivity. Electronics industry uses the conductivity characteristics to produce ceramic capacitors and other electronic components.
Hardness
According to the Mohas hardness scale of 10 points, the rutile type is 6 to 6.5, and the anatase type is 5.5 to 6.0. Therefore, in order to avoid abrasion of the spinneret in chemical fiber extinction, the anatase type is used.
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Melting point and boiling point
Since both anatase and brookite titanium dioxide will transform into rutile type titanium dioxide at high temperature. Only rutile type has a melting point and boiling point. The melting point of rutile titanium dioxide is &#;. The melting point is related to the purity of titanium dioxide. The boiling point of rutile titanium dioxide is ( ± 300) K. At this high temperature, titanium dioxide is slightly volatile.
Hygroscopicity
Although titanium dioxide is hydrophilic, its hygroscopicity isn&#;t very strong. The hygroscopicity of rutile type if smaller than the anatase type. The hygroscopicity has a certain relationship with its surface area, the higher the surface area is, the higher the hygroscopicity is. Meanwhile, it is also related to surface treatment and properties.
Thermal stability
Titanium dioxide pigment is a substance with good thermal stability, and the general dosage is 0.01% to 0.12%.
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