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Terminology
Reference 4

TiO2 (Titanium Dioxide)

Bulk Properties

Melting Point:  1850 ºC
Density: 4.3 gm/cc

Film Properties

Evap. Temp.: 1500 ºC
Film Growth:  Amorphous below 300 ºC
Film Hardness:  Very Hard

Common uses:  Multilayer coatings. 

Comments:  Very hard, tensile film.  Saltwater resistant.   Index is 10% lower at 150 ºC. (i.e. refractive index depends on substrate temperature)