Abstract

E.m.f. measurements on the concentration cells Ni/Ni(II) (a1=constant) ‖ BN sheath ‖ Ni(II) (a2)|Ni in molten LiF−NaF−KF (42.0−11.5−46.5 mole%) and LiF−BeF2−ZrF4 (65.6−29.4−5.0 mole%) at ∼500° result in linear plots of e.m.f. vs. log X2 (the mole fraction of Ni(II) in the bulk of the melt), and the slopes predicted from the Nernst equation. The measured e.m.f. values are stable. The Ni/Ni(II) couple, contained in a boron nitride sheath, is a useful reference electrode for fluoride melts.

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