3753.     YAP, C. P., AND LIU, C. L.  Free Energy, Entropy, and Heat of Formation of Fe3C.  Trans. Faraday Soc., vol. 28, 1932, pp. 788-797; Chem. Abs., vol. 27, 1933, p. 462.

        Following values are calculated from existing equilibrium data on CH₄-H₂ and CO-CO₂ mixtures over austenite and Fe₃C:3a-Fe+C=Fe₃C:∆F₂₉₈=9,300 cal., ∆H₂₉₈ 12,300 cal., ∆S₂₉₈=9.9 cal., S₂₉₈=3.8 cal. per degree.  From its free energy of formation, Fe₃C is stable above 750°.  Austenite behaves as an ideal solution and follows Raoult’s law.

        YASHIRO, R.  See abs. 1896.

        YASUDA, M.  See abs. 1895, 1916, 1917, 2210.

        YATSKOVSKAYA, N. S.  See abs. 281.