Solid Solubilities and Thermodynamic Properties of Aluminum in Solid Silicon

Abstract

The solid solubilities of aluminum in silicon in the temperature range of 1016-1622 K have been measured by introducing aluminum into solid silicon by passing a molten silicon-aluminum zone through single crystalline silicon with temperature gradient zone melting method. The maximum solubility was found to be 4.3 × 10-4 in molar fraction around 1450 K. The activity coefficient of aluminum in solid silicon at infinite dilution relative to the pure solid state was determined as RT ln γAl(s)0 = 93200(±1000) - 14.5(±0.8)T (J/mol) (1016-1622 K).