[Retracted] XRD Peak Profile Analysis of SiC Reinforced Al2O3 Ceramic Composite Synthesized by Electrical Resistance Heating and Microwave Sintering: A Comparison

Abstract

Al2O3 with 10 wt.% of SiC ceramic composite is synthesized at 1500°C by electrical resistance heating sintering with a holding time of 5 hours and microwave sintering methods with a holding time of 15 minutes. The samples generated by the two methods are characterized using powder X-ray diffraction and field emission scanning electron microscopy (FESEM). Experiments with both samples showed that the existence of the α-Al2O3 and β-SiC phases in both samples was verified by the findings of XRD pattern on both samples. Microstructure study illustrates that the Al2O3 matrix particles have spherical-like shape and their average matrix particle size is 67 ± 5 nm for electrical resistance heating sintered sample and 38 ± 5 nm for microwave sintered sample. The lattice strain and crystallite size of Al2O3 matrix were measured using Williamson–Hall (W-H) methods, which were achieved via the use of XRD peak broadening, based on a diffraction pattern. Three modified W-H models were used to compute other parameters, including strain (ε) and stress (σ), as well as energy density (u). These models were the uniform deformation model (UDM), the uniform deformation energy density model (UDEDM), and the uniform deformation stress model (UDSM). The average crystallite sizes of α-Al2O3 attained from these three models of Williamson–Hall (W–H) methods and FESEM analysis are correlated and found very close to each other. In all three models of the W-H technique, X-ray diffraction peak profile examination of electrical resistance heating-sintered and microwave-sintered Al2O3/10 wt. % SiC ceramic composite reveals that the microwave-sintered sample has finer crystallite size with less strain.

Removal of cadmium and lead ions from aqueous solutions by novel dolomite-quartz@Fe3O4 nanocomposite fabricated as nanoadsorbent

“…In addition, the XRD patterns display also a minority phase corresponding to alumina Al 2 O 3 . Indeed, the reflections that appeared at Bragg angles of 42.40°, 43.90°, and 56.60° are attributed to the presence of the rhombohedral system α-Al 2 O 3 referenced in the JCPDS file N° 71-1123 (Mohankumar et al, 2021). Further analysis will be carried out with EDS spectroscopy to strengthen this discussion.…”

“…The bands at around 1436 cm -1 , 878 cm -1 , and 789 cm -1 are due to CO 3 2groups in the dolomite structure (Correia et al, 2015;Ji et al, 2009). The absorption peaks located at 3639 cm -1 and 1631 cm -1 are attributed to the vibration of the O-H hydroxyl group and the deformation of the H 2 O molecules (Bentahar et al, 2017;Mohankumar et al, 2021). In the case of the synthesized magnetite powder Fe 3 O 4 , four characteristic bands appear in the spectrum.…”

AAO-Assisted Nanoporous Platinum Films for Hydrogen Sensor Application

“…The characteristic peak at 38.47° belongs to the Al (111) plane and is hindered compared to other planes because the vertical orientation of the nanotubes could be affecting the plane intensities. Similarly, unassigned weak peaks at 40.21° and 42.03° belong to the α-Al2O3 (006) and (113) planes, respectively [29,30]. A 20 nm Pt layer formation on top of the AAO template can be seen by the emerging peak at 39.5° in the focused red pattern.…”

Retracted: XRD Peak Profile Analysis of SiC Reinforced Al2O3 Ceramic Composite Synthesized by Electrical Resistance Heating and Microwave Sintering: A Comparison

“…Tis article has been retracted by Hindawi, as publisher, following an investigation undertaken by the publisher [1]. Tis investigation has uncovered evidence of systematic manipulation of the publication and peer-review process.…”