3.1.2. In2O3

To 15 mL of a 1.1 M In(NO3)3.H2O aqueous solution, 50 mL of a 1.2 M NaOH aqueous solution were added dropwise, under stirring. The resulting indium(III) hydroxide suspension was kept under constant stirring for one further hour, then the solid was separated by centrifugation (6000 rpm, 15 min), washed with deionized water, and dried at 80 ◦C overnight. The dried solid was grinded in a ceramic

mortar and the powder was heated in air at 300 ◦C for 2 h and then at 400 ◦C for 1 h, to convert hydroxide into indium(III) oxide, In2O3.
