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Crystal Interactions

  1. Jan 25, 2009 #1
    Hi all, I have a doubt regarding interaction energy term between atoms of crystal.
    1.) Actually in interaction energy term of Inert gas crystals, we get term as R**(-12) as repulsvie potential. But on the contra while writing term for Interaction energy term for Ionic Crystal we write Repulsive Term as “ a*exp(-R/b), about which in Kittel it is introduced as Central Field Repulsive potential.
    2.) Now Can anybody tell me why the change is made in ionic crystal?
    3.) And what’s mean by Central field Repulsive potential and what is its origin??
    Please help
     
  2. jcsd
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