Explain briefly how the technique can be used to distinguish anatase and rutile.

(a) What analytical method is routinely used to screen polymorphs of a compound? Explain briefly how the technique can be used to distinguish anatase and rutile.

(b) What are the coordination environments of each Ti (IV) centre and O2- ion in anatase?

(c) Use the unit cell in Fig. 6.30 to confirm the stoichiometry of the anatase phase.

(d) Anatase preferentially crystallizes under ambient conditions and transforms to rutile at higher temperatures. At the structural level, how do you envisage the phase change taking place?

 

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