From 4a1f703f1c1808d390ebf80e80659fe161f69fab Mon Sep 17 00:00:00 2001
From: Thomas Stephen Lee
Date: Fri, 28 Aug 2015 16:53:23 +0530
Subject: add books

---
 .../Chapter4_1.ipynb                               | 203 +++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100755 Engineering_Physics_by_P.K.Palanisamy/Chapter4_1.ipynb

(limited to 'Engineering_Physics_by_P.K.Palanisamy/Chapter4_1.ipynb')

diff --git a/Engineering_Physics_by_P.K.Palanisamy/Chapter4_1.ipynb b/Engineering_Physics_by_P.K.Palanisamy/Chapter4_1.ipynb
new file mode 100755
index 00000000..2b7c926e
--- /dev/null
+++ b/Engineering_Physics_by_P.K.Palanisamy/Chapter4_1.ipynb
@@ -0,0 +1,203 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#4: Defects in Crystals"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 4.1, Page number 4.5"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ratio of vacancies is 1.082 *10**5\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "Ev=1;\n",
+    "k=1.38*10**-23;     #boltzmann constant(J/K)\n",
+    "e=1.6*10**-19;      #charge(eV)\n",
+    "\n",
+    "#Calculation\n",
+    "r=Ev/(2.303*1000*k/e);      \n",
+    "n=10**r;                #ratio of n1000/n500\n",
+    "\n",
+    "#Result\n",
+    "print \"ratio of vacancies is\",round(n/10**5,3),\"*10**5\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 4.2, Page number 4.5"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "number of vacancies per atom at 350K is 0.5486 *10**-17\n",
+      "number of vacancies per atom at 500K is 0.827 *10**-12\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "Ev=1.2;\n",
+    "k=1.38*10**-23;     #boltzmann constant(J/K)\n",
+    "e=1.6*10**-19;      #charge(eV)\n",
+    "T1=350;    #temperature(K)\n",
+    "T2=500;    #temperature(K)\n",
+    "\n",
+    "#Calculation\n",
+    "x1=Ev/(2.303*k*T1/e);\n",
+    "n1=1/(10**x1);     #number of vacancies per atom at 350K\n",
+    "x2=Ev/(2.303*k*T2/e);\n",
+    "n2=1/(10**x2);     #number of vacancies per atom at 500K\n",
+    "\n",
+    "#Result\n",
+    "print \"number of vacancies per atom at 350K is\",round(n1*10**17,4),\"*10**-17\"\n",
+    "print \"number of vacancies per atom at 500K is\",round(n2*10**12,3),\"*10**-12\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 4.3, Page number 4.7"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "average energy required is 1.971 eV\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "d=2.82*10**-10;    #distance(m)\n",
+    "k=1.38*10**-23;     #boltzmann constant(J/K)\n",
+    "e=1.6*10**-19;      #charge(eV)\n",
+    "T=273+25;    #temperature(K)\n",
+    "sd=5*10**11;    #schotky defects(per m**3)\n",
+    "\n",
+    "#Calculation\n",
+    "V=(2*d)**3;    #volume of unit cell(m**3)\n",
+    "N=4/V;    #density of ion pairs\n",
+    "x=round(math.log10(N/sd),2);\n",
+    "Es=2*(k/e)*T*2.303*x;       #average energy required(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"average energy required is\",round(Es,3),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 4.4, Page number 4.8"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ratio of Frenkel defects is 1.125 *10**-6\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "T1=273+25;      #temperature(K)\n",
+    "T2=273+350;     #temperature(K)\n",
+    "Ef=1.35;     #energy(eV)\n",
+    "k=8.625*10**-5;\n",
+    "\n",
+    "#Calculation\n",
+    "x=(Ef/k)*((1/(2*T1))-(1/(2*T2)))/2.303;\n",
+    "r=1/(10**round(x,3));      #ratio of Frenkel defects\n",
+    "\n",
+    "#Result\n",
+    "print \"ratio of Frenkel defects is\",round(r*10**6,3),\"*10**-6\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
-- 
cgit