Abstract: Sixty-eight sodium amalgams Na_xHg_1-x (x:0. 035~0. 8846) are prepared using the Na|β-Al₂O₃|Hg solid electrolyte cells. The melting points of Na_x Hg_1-x, and the entropy and enthalpy changes of the cell reactions in the melting procets aredetermined from EMF measurements on Na/Na_xHg_1-x cells, Experimental results show that the relatiodship between the EMF and sodium molar fraction x in the Na/Na_xHg_1-x(liqui) cells may be expressed as E=a (-lgx)_b. For the ranges of x:0.06~0.16,0.16~0.333,0.333~0.715 and the different temperature ranges,the lga and b in the relation of lgE=lga+blg (-lgx) are obtained which are linear functions of the temperature.

Key words: sodium-sodium amalgam cell, sodium-mercury alloy, sodium beta-alumina