Electrochemical reduction behaviour of TiO2 powder samples, sintered at 1423 K and 1673 K and weighing similar to 1.5 g and similar to 10 g, was studied by constant voltage electrolysis at 3.1V at 1173 K. Both the samples were found to undergo reduction, but the low-temperature sintered and low-mass samples showed better overall reduction than the high-temperature sintered and high-mass samples. The reduction of the bulk parts of the samples became difficult as the sample size was increased from 1.5 g to 10 g. The size and location of the TiO2 particles in the powder electrode played an important role in the reduction of the oxide to the metal. (C) 2015 Elsevier Ltd. All rights reserved.