Japanese Journal of Applied Physics · 2012 · 22 citations · 32 references
Natural SciencesMaterials SciencePhysicsHeat TransferMaterials PhysicsThin FilmsHeat ConductionThermal DiffusivityThermal Properties Of MaterialsThin Film Electrical PropertiesThin Film Thermal PropertiesTransparent Conducting OxidesImpuritiesMean Free PathPhonon Mean Free PathPhonon ScatteringPhonon Thermal ConductivityThermal ConductivityThermophysical PropertiesThin Film Thermal Transport
The thermophysical properties of Nb-doped TiO 2 (Nb:TiO 2 ) films were studied in terms of electrical conductivity and Nb concentration. The thermal diffusivity of Nb:TiO 2 films with various Nb concentrations was investigated and found to range from (1.2–2.1)×10 -6 m 2 s -1 . The thermal conductivity of Nb:TiO 2 films with 8.5 at. % Nb concentration is proportional to the electrical conductivity in conformity with the Wiedemann–Franz law. The thermal conductivity carried by phonons, λ ph , of Nb:TiO 2 films decreased with increasing Nb concentration. The mean free path of phonons, l ph , in Nb:TiO 2 films was estimated to be almost the same as the average distance between Nb impurities. The grain size was much larger than l ph . Thus, phonon scattering by Nb impurities should be the dominant factor for the change in λ ph .
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A transparent metal: Nb-doped anatase TiO2
Yutaka Furubayashi, Taro Hitosugi, Yukio Yamamoto et al. · Applied Physics Letters · 2005 · 798 citations
Natural Sciences, Materials Engineering, Materials Science +17