抄録
To obtain highly ionic conductor of sulfides, a solid solution of 95CaS–5Na2S was prepared by sintering the powder mixture of CaS and Na2S which has the NaCl type structure and the anti-fluorite structure, respectively. Two concentration cells using the solid solution as solid electolyte were constructed as follows.
Fe, FeS|95CaS–5Na2S|Mn, MnS
Ag, Ag2S|95CaS–5Na2S|Cu, Cu2S
The reversibility of the measured e.m.f. was confirmed. The electromotive forces of the concentration cells were measured over the temperature range 670 to 1120 K . Because the measured values for the concentration cells were close to theoretical values calculated using the Nernst equation, it is concluded that the ionic transference number of the solid solution, 95CaS–5Na2S, is close to one.
