Q
titanium dioxide crystal structures
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Titanium dioxide TiO2 can naturally occur in three different crystal structures - anatase. plagioclase. and rutile. These structures differ in the arrangement of Ti and O atoms. Rutile is the most stable and commonly found form with a high refractive index. In this structure. six O atoms surround each Ti atom in an octahedral arrangement. Conversely. the O atoms are arranged in three modes - octahedral coordination. triangular bipyramidal coordination. and trigonal coordination. Rutile is often used in paints. plastics. and paper due to its stability. However. it has a lower density compared to the rhombohedral crystalline system of reiterite titanium dioxide. Although less stable. reiterite has a higher photocatalytic activity than rutile. Platelet titanite also forms in the rhombohedral crystal system like anatase but is more difficult to produce and less commonly used commercially than rutile. It can be converted to rutile at 750C as mentioned earlier. All three structures have a square lattice but differ in atom arrangement and coordination. influencing density. hardness. stability. and photocatalytic activity.
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