homework3

# homework3 - 3 , melting temperature T m = 600 K, molar heat...

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MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei homework #3 (page 1 of 2) 3. The energy required for vacancy formation in Ni is given as 1.12 eV. For Ni at 2ºC below the melting point temperature, determine the number of occupied lattice sites for every vacancy, assuming equilibrium. The melting temperature of Ni is T m = 1455ºC. 2. Calculate the difference in the molar enthalpy, entropy and Gibbs free energy at 900 K between D -Mn and E -Mn. Assume temperature independent heat capacities c p = 21.6 J/K/mol for D -Mn and c p = 34.9 J/K/mole for E -Mn. The equilibrium transition temperature between D -Mn (lower temperature phase) and E -Mn (higher temperature phase) is T trans = 993 K, ' H trans = 2000 J/mol. 1. The molar volumes of solid and liquid lead under the atmospheric pressure are, respectively, 18.92 cm 3 and 19.47 cm

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Unformatted text preview: 3 , melting temperature T m = 600 K, molar heat of melting ' H m = 4810 J. Calculate the pressure which must be applied to lead in order to increase its melting temperature by 20 degrees. MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei homework #3 (page 2 of 2) G T G P 4. Based on the schematic phase diagram for thallium given below, list the phases D , E , H , and liquid in the order of increasing density (compare the densities of phases that can be compared based on the part of the phase diagram shown in the figure). Sketch the Gibbs free energies of all phases as function of temperature at pressure of 5000 atm and as function of pressure at temperature of 350 K. . Pressure, atm Temperature, K 5000 10000 20000 15000 200 400 600 800 1000 H E D liquid P = 5000 atm T = 350 K...
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## This note was uploaded on 03/05/2012 for the course MSE 305 taught by Professor Zhigilei,l during the Spring '08 term at UVA.

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homework3 - 3 , melting temperature T m = 600 K, molar heat...

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