Abstract
Titanium dioxide nanopowders were synthesised by the sol–gel method using TiCl4 as a precursor under argon gas atmosphere. Effect of alteration of lattice strain with a change of synthesis parameters on the size of nanocrystallites and activation energy of phase transformation from anatase to rutile was investigated. Activation energy is the minimum energy required for overcoming the energy barrier for phase transformation between the two phases. The growth of nanocrystallite and a decrease in the positive lattice strain occurred when the calcinations increased from 300°C to 550°C. After the calcination increased at 600°C, the sign of the lattice strain was altered from positive to negative, the growth of crystallite continued and phase transformation occurred. In spite of the fact that the anstase crystallites grew with the increase of the gelatinisation time, the activation energy decreased. In addition, the rapid decrease of the lattice strain in the as-prepared sample in lower mixing time causes an in...
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