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  "name": ""
 },
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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 5: Crystal Imperfections"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 5.1, page no-130"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Average distance between dislocations\n",
      "\n",
      "import math \n",
      "#variable Declarat\n",
      "a=3.615*10**-10            # interatomic distance of copper\n",
      "t_ang=0.75                 # angle of tilting\n",
      "h=1.0                      # Miller indices wrt X-axis\n",
      "k=1.0                      # Miller indices wrt Y-axis\n",
      "l=0.0                      # Miller indices wrt Z-axis\n",
      "\n",
      "#calculation\n",
      "d_110=a/math.sqrt(h**2+k**2+l**2)\n",
      "D=d_110/math.tan(t_ang*math.pi/(180*2))\n",
      "\n",
      "#Result\n",
      "print('The average distance between the dislocations is %.3f A\u00b0'%(D*10**6))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The average distance between the dislocations is 0.039 A\u00b0\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 5.2, page no-130"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Schottky defects per unit cell\n",
      "\n",
      "import math\n",
      "#variable declaration\n",
      "lp=4.0185*10**-10          # lattice parameter\n",
      "dens=4285.0                # Density of CsCl in kg/m^3\n",
      "avg=6.022*10**26           # Avogadro's number\n",
      "wt_cs=132.9                # Molecular weight of Cs\n",
      "wt_cl=35.5                 # Molecular weight of Cl\n",
      "\n",
      "#calculations\n",
      "N=(dens*avg*lp**3)/(wt_cs+wt_cl)\n",
      "sd=(1-N)*100.0/1.0\n",
      "\n",
      "#Result\n",
      "print('The number of Schottky defects per unit cell = %.3f%%'%sd)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The number of Schottky defects per unit cell = 0.565%\n"
       ]
      }
     ],
     "prompt_number": 1
    }
   ],
   "metadata": {}
  }
 ]
}