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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "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": {}
+  }
+ ]
+}
+\ No newline at end of file