The confinement of phonon propagation in TiAlN/Ag multilayer coatings with anomalously low heat conductivity

Date

2016-06-03

Advisors

Journal Title

Journal ISSN

Volume Title

Publisher

American Institute of Physics

Department

Type

Article

ISSN

0003-6951

item.page.extent-format

Citation

Kovalev AI, Wainstein DL, Yu A, et al., (2016) The confinement of phonon propagation in TiAlN/Ag multilayer coatings with anomalously low heat conductivity. Applied Physics Letters, 108, 223106 (2016)

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.

Description

item.page.description-software

item.page.type-software-language

item.page.identifier-giturl

Keywords

Rights

Attribution-NonCommercial-NoDerivatives 4.0 International

item.page.relationships

item.page.relationships

item.page.relation-supplements