Thermodynamic Properties of Bismuth Trifluoride from Vapour Pressure Measurements

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J. Korean Ceram. Soc. > Volume 31(6); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(6): 685.

증기압 측정으로부터 BiF3의 열역학적 계산

김준학, S. Blairs¹

국립공업기술원 요업기술원
¹호주 NSW대학 재료공학과

Thermodynamic Properties of Bismuth Trifluoride from Vapour Pressure Measurements

ABSTRACT

Sublimation vapour pressures and sublimation enthalpy of anhydrous bismuth trifluoride have been measured by the continuous gravimetric Cnudsen-effusion method from 639-7 to 782.8 K. Additional effusion measurements have also been made from 750.6 to 863.1 K by the torsion-effusion method. Based on a correlation of subHo298.15 and subSo298.15, a recommended P(T) equation has been obtained for BiF3(s); logP= -C/T+5.2375logT-3.205$times$10-3+4.661$times$104/T2+1.348 where P is in Pa, T in Kelvin, subHo298.15 in kJ mol-1 and C=( subHo298.15-13.5149)/1.9146$times$10-2. Condensation coefficients and their temperature dependence have been derived from the effusion measurements.