MSE 460: Electronic Materials and Processing I mselogo.gif

Problem set #5; assigned February 23
  1. Correct the mistake I made in my lecture notes about calculating the enthalpy of the random 50-50 1D alloy. To do this, first enumerate all the possible configurations of an atom and its two nearest neighbors (there are 23=8 of these configurations). Each of these configurations occurs with the same probability. Then calculate the enthalpy of each configuration and weight those enthalpies by the probabilities. Do not overcount. Compare this enthalpy to the enthalpy of the ordered alloy. You can assume that the force constants aA, aB for the two atoms are equal.


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On 25 Feb 2009, 15:06.