Abstract
Electrical conductivities of MgCl2-ACl (A = Li, Na, K and Cs) binary melts were measured at temperature from liquidus to 1200K by AC bridge method. Molar conductivities show negative deviations from the additivitity. The deviation increases as the radius of alkali cation in ACl increases from Li+ to Cs+. The maximum negative deviation is found at the composition of about XACl = 2/3. Apparent activation energies for electrical conduction at XACl = 2/3 increase with an increase in radius of alkali cation and are closely related to the interaction parameter derived from heat of mixing of MgCl2-ACl binary melts. The electrical conductivity of MgCl2-ACl binary melt is greatly affected by complex formation of MgCl42-, because transport of other ions is prevented by MgCl42- of large size and low mobility.
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