Generally, the mixed oxide method involves the
heating of a mixture of zirconium oxide and titanium
oxide above 1200–1600 jC for long times [17], and
has been employed intensively in the last decade [18–
20]. The optimisation of calcination conditions used
in the mixed oxide process, however, have not
received detailed attention, and the effects of applied
dwell time and heating/cooling rates have not yet been
studied extensively to our knowledge.