Question 8 The unit cell shown below is that of a common titanium oxide mineral.

Question

Question 8 The unit cell shown below is that of a common titanium oxide mineral. The cell edges are mutually perpendicular; cell dimensions are as shown i 2.96A' 0 K2.96 a) What is the co-ordination of both Ti and O in the cell? b) What is the formula of the mineral? c) How many formula units are in the unit cell? d) What is the crystal system of the mineral? e) Suggest a name for the mineral. f) In what type of ore deposit (in WA and elsewhere) is this mineral commonly found? ii Give a brief account of the spinel minerals and their economic importance

Explanation / Answer

a. Coordination number of Ti is 6 and O is 4

b. Ti2O3

c. 1

d.

e.tistarite

f. Ti2O3 was discovered in a corundum-rich cluster of refractory grains in situ in an Allende chondrule.

ii. Thin film growth of TiO2 and Ti2O3 by the new method of liquid injection CVD investigated using optical interferometry, XRD and AFM

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