Experimental thermochemical data (temperature, pressure) corresponding to the equilibrium conditions between finegrained β‐SiC and β‐Si3N4 for carbon activity a(C) = 1 are presented. Based on these data, the temperature dependence of ΔG°f(β‐Si3N4) has been expressed for standard states Si(s), C(s), and p(N2) = 0.1 MPa by the equation ΔA°f(β‐Si3N4) = (‐995.9 + 0.4547 T/K) kJ mol for T/K ε〈1650; 1968〉.
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