Kinetic Studies of the Non-Isothermal Decomposition of Unirradiated and Γ-Irradiated Gallium Acetylacetonate

Abstract

The non-isothermal decompositions of unirradiated and g-irradiated (10 2 kGy) gallium acetylacetonate Ga(acac) 3 were carried out in static air. The results showed that the decomposition of Ga(acac) 3 proceeds through multiple decomposition steps in the temperature range 150 -310 C to produce Ga 2 O 3 as a final solid residue. Kinetic studies of the non-isothermal data for both unirradiated and g-irradiated Ga(acac) 3 were performed using both model-fitting and modelfree approaches. In a model-fitting approach, the kinetic triplet, i.e. the apparent activation energy E a , the pre-exponential factor ln A, and the reaction model f ðaÞ, were analyzed and calculated using the methods of Coats and Redfern, and Kennedy and Clark. In the model-free approach, the non-isothermal data for both unirradiated and g-irradiated samples were analyzed using the Flynn-Wall-Ozawa (FWO), Tang (T), and Vyazovkin (Vyz) isoconversional methods. The results of application of model-free and model-fitting approaches to the non-isothermal data for both unirradiated and g-irradiated Ga(acac) 3 were compared and evaluated to deduce the most probable kinetic triplet that describes correctly the thermal behaviour of Ga(acac) 3 . No significant changes were observed in the behaviour of unirradiated and g-irradiated Ga(acac) 3 either as regards their thermal decomposition or the calculated kinetic parameters.

Structural Insights into the Vapochromic Behavior of Pt- and Pd-Based Compounds

“…The best kinetic model describing the data is selected among those commonly used for solid-state reactions by using the Masterplot technique. 38 The formula of g(α) for the Avrami−Erofeév kinetic model is…”

“…where n is the parameter defining the reaction order. 38 It is determined by a fitting procedure based on the Materplot technique. 36 The parameters A and E a are then determined by fitting data with eq 2, with the function g(α) identified by the selected kinetic model.…”

Kinetic Studies of Isothermal Decomposition of Unirradiated and Γ-Irradiated Gallium Acetylacetonate: New Route for Synthesis of Gallium Oxide Nanoparticles

“…Calcination of unirradiated and g-irradiated samples of Ga(acac) 3 at 900 C for 6 h led to the formation of the b-Ga 2 O 3 nanostructure. Compared with our earlier work on nonisothermal decomposition [17] of Ga 2 O 3 , the isothermal results led to a different kinetic model which is R 2 . For non-isothermal studies the kinetic model was D 2 .…”

“…In continuation of our studies on the thermal decomposition of acetyl acetonate compounds [1,2,17], we report here the results of our studies on the thermal decomposition behaviour of unirradiated and g-irradiated Ga(acac) 3 . This was investigated in static air in order to shed more light on the kinetics of thermal decomposition of Ga(acac) 3 and the role of ionising radiation on the thermal behaviour of Ga(acac) 3 .…”

Model Free Approach for Non-Isothermal Decomposition of Un-Irradiated and g-Irradiated Silver Acetate: New Route for Synthesis of Ag2O Nanoparticles

“…Thermal treatment of inorganic substances has great synthetic potential as it may turn simple compounds into advanced materials, such as ceramics, catalysts, and glass and could reproducibly lead in most cases to metal or metal oxide nanoparticles displaying a very narrow size distribution [ 1 ]. Many recent studies on the thermal decomposition of inorganic solids have included measurements on samples that were exposed to radiation prior to heating with the air to investigate the effect of ionizing radiation on the kinetics and thermal decomposition behavior of inorganic compounds [ 2 ]. Silver acetate is a suitable metallic organic compound for preparation of silver nanoparticles for medical applications such as diagnostic biomedical optical imaging, and biological implants like heart valves [ 3 ].…”