Qiye Zheng - Academia.edu (original) (raw)
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INSTITUTE OF MANAGEMENT TECHNOLOGY, Ghaziabad, India
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Papers by Qiye Zheng
Physical Review Materials, 2017
Thermal conductivities of VNx/MgO(001) (0.76 x 1.00) epitaxial layers, grown by reactive magn... more Thermal conductivities of VNx/MgO(001) (0.76 x 1.00) epitaxial layers, grown by reactive magnetron
sputter deposition, are measured in the temperature range 300 < T < 1000K using time-domain thermoreflectance
(TDTR). Data for the total thermal conductivity are compared to the electronic contribution to
the thermal conductivity calculated from the measured electrical conductivity, the Wiedemann-Franz law,
and an estimate of the temperature dependence of the Lorenz number L(T). The total thermal conductivity
is dominated by electron contribution and varies between 13Wm−1 K−1 at x = 0.76 and 20Wm−1 K−1 at
x = 1.00 for T = 300K and between 25 and 35Wm−1 K−1 for T = 1000 K. The lattice thermal conductivity
vs x ranges from 5 to 7Wm−1 K−1 at 300 K and decreases by 20% at 500 K. The low magnitude and weak
temperature dependence of the lattice thermal conductivity are attributed to strong electron-phonon coupling
in VN.
Physical Review Materials, 2017
Thermal conductivities of VNx/MgO(001) (0.76 x 1.00) epitaxial layers, grown by reactive magn... more Thermal conductivities of VNx/MgO(001) (0.76 x 1.00) epitaxial layers, grown by reactive magnetron
sputter deposition, are measured in the temperature range 300 < T < 1000K using time-domain thermoreflectance
(TDTR). Data for the total thermal conductivity are compared to the electronic contribution to
the thermal conductivity calculated from the measured electrical conductivity, the Wiedemann-Franz law,
and an estimate of the temperature dependence of the Lorenz number L(T). The total thermal conductivity
is dominated by electron contribution and varies between 13Wm−1 K−1 at x = 0.76 and 20Wm−1 K−1 at
x = 1.00 for T = 300K and between 25 and 35Wm−1 K−1 for T = 1000 K. The lattice thermal conductivity
vs x ranges from 5 to 7Wm−1 K−1 at 300 K and decreases by 20% at 500 K. The low magnitude and weak
temperature dependence of the lattice thermal conductivity are attributed to strong electron-phonon coupling
in VN.