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Title: Thermal conductivity of (VO 2) 1-xCu x composites across the phase transition temperature

In this paper, the thermal conductivity across the metal-insulator transition (MIT) of hot-pressed polycrystalline vanadium dioxide (VO 2) samples is studied. The change in the total thermal conductivity (k) of hot-pressed VO 2 is insignificant across the MIT temperature. By adding copper (Cu) to make (VO 2) 1-xCu x composites with x from 0 to 0.5, we find an increase in the electrical conductivity from 4 × 10 4 S m -1 to 1 × 10 6 S m -1 at 120 °C, resulting in an electronic thermal conductivity increase from 0.38 W m -1 K -1 for x = 0 to 3.8 W m -1 K -1 for x = 0.3, which is a significant increase. However, the total thermal conductivity did not increase due to the decrease in the value of the Lorenz number by an order of magnitude than its standard value using the Wiedemann-Franz relationship. Finally, on the basis of our experimental result, an empirical model is proposed to explain the thermal conductivity behavior of all (VO 2) 1-xCu x samples with different Cu concentrations.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [1]
  1. Univ. of Houston, TX (United States). Dept. of Physics. Texas Center for Superconductivity (TcSUH)
  2. Univ. of Houston, TX (United States). Dept. of Physics. Texas Center for Superconductivity (TcSUH); Harbin Inst. of Technology, Shenzhen (China). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
SC0010831
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 15; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Houston, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Toyota of North America
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electrical conductivity; metal phase transitions; conductivity transitions; thermal models; X-ray diffraction; powders; composite models; hot pressing; thermal conductivity
OSTI Identifier:
1465335
Alternate Identifier(s):
OSTI ID: 1361834

Dahal, Keshab, Zhang, Qian, He, Ran, Mishra, Ishwar Kumar, and Ren, Zhifeng. Thermal conductivity of (VO2)1-xCux composites across the phase transition temperature. United States: N. p., Web. doi:10.1063/1.4981241.
Dahal, Keshab, Zhang, Qian, He, Ran, Mishra, Ishwar Kumar, & Ren, Zhifeng. Thermal conductivity of (VO2)1-xCux composites across the phase transition temperature. United States. doi:10.1063/1.4981241.
Dahal, Keshab, Zhang, Qian, He, Ran, Mishra, Ishwar Kumar, and Ren, Zhifeng. 2017. "Thermal conductivity of (VO2)1-xCux composites across the phase transition temperature". United States. doi:10.1063/1.4981241. https://www.osti.gov/servlets/purl/1465335.
@article{osti_1465335,
title = {Thermal conductivity of (VO2)1-xCux composites across the phase transition temperature},
author = {Dahal, Keshab and Zhang, Qian and He, Ran and Mishra, Ishwar Kumar and Ren, Zhifeng},
abstractNote = {In this paper, the thermal conductivity across the metal-insulator transition (MIT) of hot-pressed polycrystalline vanadium dioxide (VO2) samples is studied. The change in the total thermal conductivity (k) of hot-pressed VO2 is insignificant across the MIT temperature. By adding copper (Cu) to make (VO2)1-xCux composites with x from 0 to 0.5, we find an increase in the electrical conductivity from 4 × 104 S m-1 to 1 × 106 S m-1 at 120 °C, resulting in an electronic thermal conductivity increase from 0.38 W m-1 K-1 for x = 0 to 3.8 W m-1 K-1 for x = 0.3, which is a significant increase. However, the total thermal conductivity did not increase due to the decrease in the value of the Lorenz number by an order of magnitude than its standard value using the Wiedemann-Franz relationship. Finally, on the basis of our experimental result, an empirical model is proposed to explain the thermal conductivity behavior of all (VO2)1-xCux samples with different Cu concentrations.},
doi = {10.1063/1.4981241},
journal = {Journal of Applied Physics},
number = 15,
volume = 121,
place = {United States},
year = {2017},
month = {4}
}