The Effect of Calcination Temperature on Crystal Structure of (Al,Cr)2O3 Solid Solution
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Creator Yotin Kallayalert
Title The Effect of Calcination Temperature on Crystal Structure of (Al,Cr)2O3 Solid Solution
Contributor Chalo Wongsawang, Benjamas Keawnuch, Chumphol Busabok
Publisher คณะวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยเทคโนโลยีราชมงคลธัญบุรี
Publication Year 2562
Journal Title วารสารวิทยาศาสตร์และเทคโนโลยี มทร.ธัญบุรี
Journal Vol. 9
Journal No. 1
Page no. 66-70
Keyword XRD pattern, Calcination, Solid solution, Alumimium oxide, Chromium oxide
URL Website http://www.sci.rmutt.ac.th/stj
Website title Science and Technology RMUTT Journal
ISSN 2229-1547
Abstract (Al,Cr)2O3 solid solutions were synthesized using aluminium oxide (Al2O3) and chromium oxide (Cr2O3) as the starting materials. These two oxide powders were mixed at 1:1 mole ratio using ball mill. Then the mixture was dried and calcined for 2 hours at various temperatures of 1,500 ?C, 1,600 ?C and 1,700 ?C. The structures of the prepared powders were investigated by X-ray diffraction (XRD) technique. The XRD result showed that (Cr1-x, Alx)2O3 presented as a new phase in the calcined powders for all temperatures. The XRD pattern illustrated intensity of (Cr1-xAlx)2O3 peaks slightly increased and shifted to Al2O3 peaks when the calcination temperature increase, while intensity of Al2O3 peaks gradually decreased. From this result, it can be implied that Cr3+ in Cr2O3 rhombohedral structure was gradually substituted by Al3+ at high temperature. However, the completed reaction was clearly shown at 1,700 oC. In addition lattice parameters (d-spacing 311 plane. a and c) were inversing with the calcined temperature.
วารสารวิทยาศาสตร์และเทคโนโลยี มทร.ธัญบุรี

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