TY - JOUR
T1 - Thermal transport properties of hafnium hydrides and deuterides
AU - Tsuchiya, B.
AU - Arita, Y.
AU - Muta, H.
AU - Kurosaki, K.
AU - Konashi, K.
AU - Nagata, S.
AU - Shikama, Tatsuo
PY - 2009/8/1
Y1 - 2009/8/1
N2 - The thermal conductivities of δ′-, δ-, δ+ε-, and ε-phase hafnium hydrides and deuterides with various hydrogen isotope concentrations (HfHx, 1.48 ≤ x ≤ 2.03; HfDx, 1.55 ≤ x ≤ 1.94) were evaluated within the temperature range of 290-570 K from the measured thermal diffusivity, calculated specific heat, and density. The thermal conductivities of δ′-, δ-, δ+ε-, and ε-phase HfHx and HfDx are independent of the temperature within the range 300-550 K and are in the range 0.15-0.22 W/cm K and 0.17-0.23 W/cm K, respectively; these values are similar to and lower than the observed thermal conductivities of α-phase Hf. The experimental results for the electrical resistivities of δ′-, δ-, δ+ε-, and ε-phase HfHx and HfDx and the Lorenz number corresponding to the electronic conduction, obtained from the Wiedemann-Franz rule, indicated that heat conduction due to electron migration significantly influences the thermal conductivity values at high temperatures. On the other hand, heat conduction due to phonon migration significantly affects the isotope effects on the thermal transport properties.
AB - The thermal conductivities of δ′-, δ-, δ+ε-, and ε-phase hafnium hydrides and deuterides with various hydrogen isotope concentrations (HfHx, 1.48 ≤ x ≤ 2.03; HfDx, 1.55 ≤ x ≤ 1.94) were evaluated within the temperature range of 290-570 K from the measured thermal diffusivity, calculated specific heat, and density. The thermal conductivities of δ′-, δ-, δ+ε-, and ε-phase HfHx and HfDx are independent of the temperature within the range 300-550 K and are in the range 0.15-0.22 W/cm K and 0.17-0.23 W/cm K, respectively; these values are similar to and lower than the observed thermal conductivities of α-phase Hf. The experimental results for the electrical resistivities of δ′-, δ-, δ+ε-, and ε-phase HfHx and HfDx and the Lorenz number corresponding to the electronic conduction, obtained from the Wiedemann-Franz rule, indicated that heat conduction due to electron migration significantly influences the thermal conductivity values at high temperatures. On the other hand, heat conduction due to phonon migration significantly affects the isotope effects on the thermal transport properties.
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U2 - 10.1016/j.jnucmat.2009.04.009
DO - 10.1016/j.jnucmat.2009.04.009
M3 - Article
AN - SCOPUS:67650995974
VL - 392
SP - 464
EP - 470
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 3
ER -