Abstract
We have investigated an electrode of the third kind consisting of a nickel wire immersed in molten 2LiFBeF2 containing excess NiO and BeO. A low concentration of dissolved Ni2+ is produced by saturation of the melt with this oxide mixture, and this results in an electrode considerably less oxidizing than previously used Ni2+|Ni0 electrodes. The reliability of the NiO electrode, which may be represented as Be2+|NiO, BeO, Ni0, was established by potentiometric measurementsvs the Be2+|Be0 electrode in the cell Be0|LiP(·667),BeF2(·333)|NiO(c),BeO(c)|Ni0 the assumed cell reaction being Be0(c)+NiO(c)⇌BeO(c)+Ni0(c) The measured potentials were fitted by least squares to the expression E0 = A + BT (with B assigned from available entropy and heat capacity data), giving E0=1·9075−0·000056T(T=780−980°K) The average deviation from this expression was 2·1 mV. The magnitude of E0 was in the range expected from available thermochemical values for BeO and NiO.
Published Version
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