Thermal diffusivity and electrical resistivity of zirconium hydride

The effects of phase transformation on the heat conduction of hafnium hydrides

“…Furthermore, the thermal diffusivities at temperatures above 400 K for HfH 0.92-2.02 were almost constant in the range of 0.06-0.08 cm 2 /s, and were about a factor of one-half lower than that of ␣-Hf. Also, the composition dependence of the thermal diffusivity for HfH 1.76-2.02 indicates that phonon scattering due to electrons and phonons has a greater effect on the mixed phases and non-stoichiometric structures, which is consistent with past results for ZrH 1.76-2.02 [9]. [11].…”

“…1(c), the thermal diffusivity increased with decreasing temperature and increasing hydrogen concentration. It is known that phonon-phonon and electron-phonon scattering contribute to the temperature dependence of the thermal diffusivity according to the relationship between the thermal and electrical conductivities for -phase zirconium and ␦-phase titanium hydrides [9,10]. Additionally, the thermal diffusivity of ␦ + -HfH 1.76 is lower yet than that of -HfH x , which decreases with a decrease in the composition (x) from 2.02 to 1.88.…”

Isotope Effects in Thermal Diffusivity and Electrical Resistivity of Zirconium Hydride and Deuteride

“…The thermal diffusivity and the electrical resistivity measurements were made using a laser-flash 4) and the fourcontact DC 5) methods, respectively. For both measurements, the specimens were heated up to 600 K because it has been reported that ZrH x and ZrD x decomposes quickly at temperatures above 700 K. 8) The each measurement was performed on heating and cooling of the specimen.…”

“…So far, the hydrogen concentration and temperature dependences on their properties for zirconium hydride (ZrH x ) or deuteride (ZrD x ) have been extensively investigated by many workers. [3][4][5][6][7] However, the data for the thermal and electrical conductivities of ε-phase ZrH x or ZrD x with high hydrogen concentration near stoichiometry (x=2.0) at high temperatures around 600 K have not been reported yet. In the present study, the thermal diffusivities and the electrical resistivities of ε-phase ZrH x and ZrD x have been measured in the temperature range from room temperature to 600 K. The isotope effects in the thermal properties have been also discussed.…”

Decomposition kinetics study of zirconium hydride by interrupted thermal desorption spectroscopy

“…This may affect the stability and integrity of hydride fuel, which is the major performance constraint for these reactors. Although many studies on the thermal, mechanical and electrical properties of zirconium hydride have been reported [8][9][10][11], limited information is available on hydrogen desorption kinetic process. It is required to understand the hydrogen desorption kinetics of zirconium hydride, which is important for understanding the final state of the hydride, such as the amount of hydrogen remaining after thermal processing.…”