There are three crystalline phases for tio2 , including rutile . anatase and brookite . transformation of crystalline phase occurs at a certain temperature and pressure Tio _ 2具有金红石、锐钛矿和板钛矿三种晶体结构，在一定温度和压力下可发生晶体结构的转变。
2.
The tio2 colloidal particles are brookite nanocrystals , and the pss / ti02 films are polycrystalline films with relatively high hardness and can serve the function as reflection - enhancing coatings Pss tio _ 2薄膜为由板钛矿tio _ 2纳米晶所构成的多晶膜，硬度较高，具有增反作用。
