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Thermal stability of wurtzite Zr1-xAlxN coatings studied by in situ high-energy x-ray diffraction during annealing
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Helmholtz Zentrum Geesthacht, Germany.
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2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, no 3, 035309Article in journal (Refereed) Published
Abstract [en]

We study the thermal stability of wurtzite (w) structure ZrAlN coatings by a combination of in situ high-energy x-ray scattering techniques during annealing and electron microscopy. Wurtzite structure Zr1-xAlxN coatings with Al-contents from x = 0.46 to x = 0.71 were grown by cathodic arc evaporation. The stability of the w-ZrAlN phase depends on chemical composition where the higher Al-content coatings are more stable. The wurtzite ZrAlN phase was found to phase separate through spinodal decomposition, resulting in nanoscale compositional modulations, i.e., alternating Al-rich ZrAlN layers and Zr-rich ZrAlN layers, forming within the hexagonal lattice. The period of the compositional modulations varies between 1.7 and 2.5 nm and depends on the chemical composition of the coating where smaller periods form in the more unstable, high Zr-content coatings. In addition, Zr leaves the w-ZrAlN lattice to form cubic ZrN precipitates in the column boundaries. (C) 2015 AIP Publishing LLC.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2015. Vol. 118, no 3, 035309
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-120742DOI: 10.1063/1.4927156ISI: 000358429200055OAI: oai:DiVA.org:liu-120742DiVA: diva2:848212
Note

Funding Agencies|VINN Excellence Center on Functional Nanoscale Materials (FunMat); Rontgen-Angstrom Cluster [VR 2011-6505]

Available from: 2015-08-24 Created: 2015-08-24 Last updated: 2017-12-04

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Rogström, LinaGhafoor, NaureenSchroeder, JeremyBirch, JensOdén, Magnus

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