Phase transformations in face centered cubic (Al0.32Cr0.68)(2)O-3 thin films
2012 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 206, no 14, 3216-3222 p.Article in journal (Refereed) Published
Face centered cubic (Al0.32Cr0.68)(2)O-3 thin films have been annealed in the temperature range of 500-1000 degrees C during 2-8 h. The fcc structure of the film remains intact when annealed at temperatures up to 700 degrees 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 degrees C for 2 h, where annealing at 1000 degrees C for 2 h results in complete phase transformation to alpha-(Al0.32Cr0.68)(2)O-3. In-plane and out-of-plane line scans performed in EDX TEM and theta/2 theta XRD patterns did not show any phase separation into alpha-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.
Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 206, no 14, 3216-3222 p.
fcc Al-Cr-O alloys, Phase transformation kinetics, Corundum solid solution, Annealing
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-76809DOI: 10.1016/j.surfcoat.2012.01.008ISI: 000301903100009OAI: oai:DiVA.org:liu-76809DiVA: diva2:516827
Funding Agencies|Swedish Research Council (VR)||2012-10-152012-04-202016-08-31Bibliographically approved