Electrical Resistivity Versus Deuterium Concentration in Palladium

Cooling rate dependence of the resistivity increase during hydrogen (deuterium) ordering in Pd–H(D) and Pd–Fe–H(D) alloys

“…The appearance of the resistivity maximums at higher temperature in the heating-up curves and the saturation of the resistivity values at higher temperature in the Pd-Fe alloy are caused by the higher migration energies of hydrogen isotopes in the alloy. The hydrogen concentrations in Pd-Fe alloy were not determined because we have no estimation method from the resistance ratio different from the pure Pd case [17,18]. For future estimations the resistance ratios (at 273.3 K) of the present Pd-5 at.% Fe-H and D specimen are given here as R H /R O = 2.46 and 1.93, respectively.…”

Resistivity behavior in isothermal annealing of Pd–H(D) alloys around 50K

“…Before hydrogen (deuterium) charging the specimen wires of 0.15 mm in diameter and foils of 50-100 m in thickness with two spot-welded Pd lead wires were annealed in vacuum for longer than 3 h at 873-1073 K. The amount of hydrogen (deuterium) charged in the specimen was determined by the resistivity ratio at 273.2 K for pure Pd as before [15]. The hydrogen (deuterium) concentrations were below the maximum of the resistivity composition isotherms at 273.2 K [19,20]. After the hydrogen (deuterium) charging, the specimens were mounted on a base block in a temperature-variable chamber.…”

Gas loading of deuterium in palladium at low temperature

“…10a. It is well known [5] that at room temperature the resistance of a PdD X sample reaches a maximum for X ≈ 0.75, and this is the value that the loading ratio was approaching in this experiment towards the end of the first episode. The ratio between the maximum value of the resistance, R max , and the value of the resistance in the absence of absorbed deuterium, R 0 , is R max /R 0 = 221.7/84.1 = 2.64: this value is, as expected, rather higher than the value measured at room temperature, which is about 2.…”

“… The temperature of the S 2 shield, T S2 .  The cell temperature, T c = T 5 .  The pressure in the system, P.  The resistance of the five sections of the palladium serpentine: R 1 , R 2 , R 3 , R 4 , R 5 (the last section, R5, was broken a little time after being exposed to deuterium, and was shortcircuited).…”