Neubestimmung der Temperaturabhängigkeit der Elektromotorischen Kraft der Internationalen Weston-Elemente im Bereich von 10 bis 30 °C

Abstract

8. -van Dijk, H., Durieux, M.: Differences between the CCT-64 scale of temperatures and the gas thermometer scales of NBS, KPL, PRMI, PSU, in the temperature range below 91 "K, Document No. 1 presented to Comitb Consultatif de Thermombtrie, 8th session, 1966.

The EMF-temperature coefficient of "acid" standard cells of the saturated cadmium sulfate type from 15 to 40 C

“…At about the same time covered by this investigation , Froehlich and Melchert, with the assistance of Steiner, in the laboratories of the Physikalisch-Technische Bundesanstalt , also carried out a study of the emftemperature coefficient of "acid" standard cells over the range of 10 to 30°C and published their results in April, 1971 [25]. The pH of the electrolyte used in the cells was 1.4 ± 0.2; the hydrogen-ion activity was, therefore , of the order of 0.04.…”

“…With this correction the emfs of the NBS cells approximate that of the so-called "neutral" cell; apparently, the acid in the cells is largely neutralized by the alkaline constituent of the glass container during the aging period (this is exhibited by the upward drift in emf with time, as mentioned earlier in this paper). Finally in table 6 values of the second derivative, d 2 E/dT2, and in table 7 values of the entropy and heatcapacity changes for the cell reaction in "acid" x-Physikalisch·Technische Bundesanstalt [25]. ~Vigoureux and Watts [191.…”