Measurement of the hysteretic thermal properties of W-doped and undoped nanocrystalline powders of VO₂.

ABSTRACT: Hysteresis loops exhibited by the thermal properties of undoped and 0.8 at.% W-doped nanocrystalline powders of VO₂ synthesized by means of the solution combustion method and compacted in pellets, are experimentally measured by photothermal radiometry. It is shown that: (i) the W doping reduces both the hysteresis loops of VO₂ and its transition temperature up to 15 °C. (ii) The thermal diffusivity decreases (increases) until (after) the metallic domains become dominant in the VO₂ insulating matrix, such that its variation across the metal-insulation transition is enhanced by 23.5% with W-0.8 at.% doping. By contrast, thermal conductivity (thermal effusivity) increases up to 45% (40%) as the metallic phase emerges in the VO₂ structure due to the

SUBMITTER: Gomez-Heredia CL 

PROVIDER: S-EPMC6789116 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature