Kinetic studies for the non-isothermal decomposition of un-irradiated and γ-irradiated indium acetyl acetonate In(acac) 3 with 10 2 kGy total γ-ray dose were carried out in static air. The results showed that the decomposition proceeds in one major step in the temperature range of 150-250 °C with the formation of In 2 O 3 as solid residue. The non-isothermal data for un-irradiated and γ-irradiated In(acac) 3 were analysed using linear Flynn-WallOzawa (FWO) and nonlinear Vyazovkin (VYZ) iso-conversional methods. The results of application of these free models on the investigated data showed a systematic dependence of E a on α indicating a simple decomposition process. No significant changes were observed in both decomposition behaviour and (Eα-α) dependency between unirradiated and γ-irradiated In(acac) 3 . Calcination of In(acac) 3 at 400 °C for 5 hours led to the formation of In 2 O 3 monodispersed nanoparticles. X-ray diffraction, FTIR and SEM techniques were employed for characterization of the synthesised nanoparticles. This is the first attempt to prepare In 2 O 3 nanoparticles by solid state thermal decomposition of In(acac) 3 .
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