Spinodal decomposition of Al0.3In0.7N(0001) layers following in-situ thermal annealing as investigated by STEM-VEELS
2012 (English)Manuscript (preprint) (Other academic)
The thermal stability and spinodal decomposition of thin Al0.3In0.7N layers was studied in-situ by scanning transmission electron microscopy following annealing in a temperature range from 700 oC to 900 oC. The results show that for increasing layer thicknesses (from ~4 nm to ~22 nm) surface directed spinodal decomposition is initiated at Al0.3In0.7N/AlN interfaces and columnar boundaries in the Al0.3In0.7N layers. In the thin layers (~10 nm) annealing caused a single composition layer to split into doubly modulated layers with a compositional undulation perpendicular to the interfaces, while for the thicker layers (~22 nm) the spinodally decomposed structure is more random.
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IdentifiersURN: urn:nbn:se:liu:diva-85906OAI: oai:DiVA.org:liu-85906DiVA: diva2:573690