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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 14: Bonding In Crystals"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 1, Page number 361"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"potential energy per ion pair is -3.981 eV\n",
"answer in the book varies due to rounding off errors\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration \n",
"e=1.6*10**-19; #charge of electron(coulomb)\n",
"r0=2.81*10**-10; #distance between ions(m)\n",
"A=1.748; #constant\n",
"x=9*10**9; #let x=1/(4*math.pi*epsilon0)\n",
"n=9; \n",
"\n",
"#Calculations\n",
"U0=-x*A*e**2*(1-(1/n))/(e*r0); #potential energy per ion pair(eV)\n",
"\n",
"#Result\n",
"print \"potential energy per ion pair is\",round(U0/2,3),\"eV\"\n",
"print \"answer in the book varies due to rounding off errors\""
]
}
],
"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": "2.7.11"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
