High loading would be .88 which is 267K == -6.15C = 21F which is not room temperature.
Which raises the question: Is there a critical loading threshold for Ni? On Wed, Jul 24, 2013 at 11:18 PM, H Veeder <[email protected]> wrote: > Since exceeding the Debye temperature of nickel appears to be necessary to > produce heat from Ni-H systems, I was wondering if the Debye temperature of > palladium must be exceeded too in Pd systems. I did a search for the Debye > of temperature of palladium and found this abstract from 1966: > > http://prola.aps.org/abstract/PR/v146/i2/p463_1 > > C. A. > Mackliet<http://publish.aps.org/search/field/author/C.%20A.%20Mackliet>and A. > I. Schindler<http://publish.aps.org/search/field/author/A.%20I.%20Schindler> > U. S. Naval Research Laboratory, Washington, D. C. > > Received 31 January 1966; published in the issue dated June 1966 > > Specific-heat measurements in the 1.2 to 4.2°K range have been carried out > on four H-Pd specimens having H/Pd atomic ratios of 0.57, 0.70, 0.81, and > 0.88. Corresponding values of γ (the electronic-specific-heat > coefficient) are 2.52, 1.38, 1.40, and 1.61 mJ/deg2 per g atom of > palladium; values of ΘD (the Debye temperature) are 282, 273, 276, and > 267°K, respectively. A "dynamic" method of measurement was necessarily > employed because of the occurrence of an exothermic process in these > alloys. The interpretation of the data was complicated by the interstitial > character of these alloys, but the present results for the electronic > specific heat appear to offer unusually direct support for the usual simple > band picture of Pd and H-Pd alloys. Special care must be exercised in the > interpretation of the Debye temperatures in this case. > > > > > > What is the "exothermic process in these alloys". Is it an anomalous heat > effect or expected chemical effect? Anyway you can see that the Debye > temperature of Pd is much lower than Nickel so it doesn't doesn't > require any prewarming if it is at room temperature. > > > > harry > > > > Harry > > >
