کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1658613 | 1008350 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Phase transformations in face centered cubic (Al0.32Cr0.68)2O3 thin films Phase transformations in face centered cubic (Al0.32Cr0.68)2O3 thin films](/preview/png/1658613.png)
Face centered cubic (Al0.32Cr0.68)2O3 thin films have been annealed in the temperature range of 500–1000 °C during 2–8 h. The fcc structure of the film remains intact when annealed at temperatures up to 700 °C for 8 h. X-ray diffraction and transmission electron microscopy show the onset of phase transformation to corundum phase alloys in the sample annealed at 900 °C for 2 h, where annealing at 1000 °C for 2 h results in complete phase transformation to α-(Al0.32Cr0.68)2O3. In-plane and out-of-plane line scans performed in EDX TEM and θ/2θ XRD patterns did not show any phase separation into α-Cr2O3 and Al2O3 prior and after the annealing. The apparent activation energy of this process is 380–480 kJ/mol as determined by the Johnson–Mehl–Avrami model.
► The fcc structure of the films remained intact up to 700 °C.
► Phase transformation is started in the sample annealed in 900 °C for 2 h.
► Phase transformation from fcc to corundum is completed in 1000 °C.
► No phase separation into the binary α-Cr2O3 and Al2O3 is observed.
► The apparent activation energy is calculated in the range of 380–480 kJ/mol.
Journal: Surface and Coatings Technology - Volume 206, Issue 14, 15 March 2012, Pages 3216–3222