Title Spectral evidence of spinodal decomposition, phase transformation and molecular nitrogen formation in supersaturated TiAlN films upon annealing
Authors ENDRINO ARMENTEROS, JOSÉ LUIS, Rhammar C. , Gutiérrez A. , Gago R. , Horwat D. , Soriano L. , Fox-Rabinovich G. , Martín Y Marero D. , Guo J. , Rubensson J.-E. , Andersson J.
External publication Si
Means Acta Mater.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.75500
SJR Impact 3.21500
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-80051795161&doi=10.1016%2fj.actamat.2011.06.039&partnerID=40&md5=d272469cdd1a260ebb9648757becea7d
Publication date 01/01/2011
ISI 000294936600009
Scopus Id 2-s2.0-80051795161
DOI 10.1016/j.actamat.2011.06.039
Abstract Thermal treatment of supersaturated Ti1-xAl xN films (x ˜ 0.67) with a dominant ternary cubic-phase were performed in the 700-1000 °C range. Grazing incidence X-ray diffraction (GIXRD) shows that, for annealing temperatures up to 800 °C, the film structure undergoes the formation of coherent cubic AlN (c-AlN) and TiN (c-TiN) nanocrystallites via spinodal decomposition and, at higher temperatures (=900 °C), GIXRD shows that the c-AlN phase transforms into the thermodynamically more stable hexagonal AlN (h-AlN). X-ray absorption near-edge structure (XANES) at the Ti K-edge is consistent with spinodal decomposition taking place at 800 °C, while Al K-edge and N K-edge XANES and X-ray emission data show the nucleation of the h-AlN phase at temperatures >800 °C, in agreement with the two-step decomposition process for rock-salt structured TiAlN, which was also supported by X-ray diffraction patterns and first-principle calculations. Further, the resonant inelastic X-ray scattering technique near the N K-edge revealed that N2 is formed as a consequence of the phase transformation process. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords Absorption spectra; Aluminum nitride; III-V semiconductors; Nanocrystalline materials; Nanocrystals; Nitrogen; Phase transitions; Superconducting materials; Tin; Titanium nitride; X ray absorption; X
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