A TMA and DSC study of the kinetics of the solid-state reaction in an Al <sub>2</sub> O <sub>3</sub> –Y <sub>2</sub> O <sub>3</sub> system
This study focuses on the kinetic analysis of the solid-phase reactivity of mixtures of Al<sub>2</sub>O<sub>3</sub> and Y<sub>2</sub>O<sub>3</sub> powders, introduced in stoichiometric proportions for the formation of the YAG phase (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>). Structural and microstructural analyses using XRD, TEM, STEM, and SEM provided a better understanding of the reaction mechanism of the formation of the YAG phase, which appears to be of a heterogeneous nucleation-growth type. The second part of this study focused on a kinetic analysis of these reactions, using the Kissinger model applied to data obtained by differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). Activation energies equal to 560 kJ mol<sup>-1</sup> for the formation of YAP and 660 kJ mol<sup>-1</sup> for the formation of the YAG phase were obtained by both methods, meaning that the reaction should be limited by the diffusion of Y<sup>3+</sup> ions.
Authors
- Alexandre Maı̂tre (ORCID: https://orcid.org/0000-0002-4706-3741)
- Loïc Favergeon (ORCID: https://orcid.org/0000-0001-8181-867X)
- Loïck Bonnet
- Rémy Boulesteix (ORCID: https://orcid.org/0000-0003-2277-8545)
- Nathan Kerkad
Institutions
- Université Claude Bernard Lyon 1 (FR)
- Centre National de la Recherche Scientifique (FR)
- Mines Saint-Étienne (FR)
- Marion Technologies (France) (FR)
- Université de Limoges (FR)
Publication Details
- Journal
- Physical Chemistry Chemical Physics
- Published
- 2025-11-28
- DOI
- https://doi.org/10.1039/d5cp03930d
- Primary Topic
- Luminescence Properties of Advanced Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00