Title The confinement of phonon propagation in TiAlN/Ag multilayer coatings with anomalously low heat conductivity
Authors Kovalev, A. I. , Wainstein, D. L. , Rashkovskiy, A. Yu. , Gago, R. , Soldera, F. , ENDRINO ARMENTEROS, JOSÉ LUIS
External publication Si
Means Appl. Phys. Lett.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.41100
SJR Impact 1.67300
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84974604051&doi=10.1063%2f1.4953230&partnerID=40&md5=cdfbc97c15147c90f4d9ad56fdf92f05
Publication date 30/05/2016
ISI 000378428400037
Scopus Id 2-s2.0-84974604051
DOI 10.1063/1.4953230
Abstract TiAlN/Ag multilayer coatings with a different number of bilayers and thicknesses of individual layers were fabricated by DC magnetron co-sputtering. Thermal conductivity was measured in dependence of Ag layer thickness. It was found anomalous low thermal conductivity of silver comparing to TiAlN and Ag bulk standards and TiAlN/TiN multilayers. The physical nature of such thermal barrier properties of the multilayer coatings was explained on the basis of reflection electron energy loss spectroscopy. The analysis shows that nanostructuring of the coating decreases the density of states and velocity of acoustic phonons propagation. At the same time, multiphonon channels of heat propagation degenerate. These results demonstrate that metal-dielectric interfaces in TiAlN/Ag coatings are insurmountable obstacles for acoustic phonons propagation. Published by AIP Publishing.
Keywords Aluminum compounds; Electromagnetic wave emission; Electron energy levels; Electron energy loss spectroscopy; Electron scattering; Energy dissipation; Magnetrons; Multilayers; Phonons; Silver; Thermal
Universidad Loyola members

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