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Title: Interplay between mass-impurity and vacancy phonon scattering effects on the thermal conductivity of doped cadmium oxide

Understanding the impact and complex interaction of thermal carrier scattering centers in functional oxide systems is critical to their progress and application. In this work, we study the interplay among electron and phonon thermal transport, mass-impurity scattering, and phonon-vacancy interactions on the thermal conductivity of cadmium oxide. We use time domain thermoreflectance to measure the thermal conductivity of a set of CdO thin films doped with Dy up to the saturation limit. Using measurements at room temperature and 80‚ÄČK, our results suggest that the enhancement in thermal conductivity at low Dy concentrations is dominated by an increase in the electron mobility due to a decrease in oxygen vacancy concentration. Furthermore, we find that at intermediate doping concentrations, the subsequent decrease in thermal conductivity can be ascribed to a large reduction in phononic thermal transport due to both point defect and cation-vacancy scattering. With these results, we gain insight into the complex dynamics driving phonon scattering and resulting thermal transport in functional oxides.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States)
  2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
  3. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States)
Publication Date:
OSTI Identifier:
22489279
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CADMIUM OXIDES; CARRIERS; DOPED MATERIALS; ELECTRON MOBILITY; IMPURITIES; MASS; OXYGEN; PHONONS; SCATTERING; TEMPERATURE RANGE 0273-0400 K; THERMAL CONDUCTIVITY; THIN FILMS; VACANCIES