The solid-state reactions between SrCO 3 and Al 2O 3 forming SrAl 2O 4 under air and CO 2-air atmospheres were investigated. The solid-state reaction between SrCO 3 and Al 2O 3 under a CO 2 atmosphere can be separated into multiple reaction stages. The first stage is attributed to the formation of SrAl 2O 4 resulting from the reaction between SrCO 3 and Al 2O 3. The diffusion of Al 2O 3 through the product layer then takes place to continue the reaction. At a higher temperature, the Sr 3Al 2O 6 formation reaction occurs due to the chemical reaction between SrCO 3 and SrAl 2O 4. The SrCO 3 is thermally finally decomposed. The resulting SrO may diffuse rapidly through the product layer, producing pure SrAl 2O 4 formation via a complicated diffusion process at a much higher temperature. These reaction stages occur at very close temperatures under an air atmosphere, leading to a complex reaction between the solids in air.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry