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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": {}
}
]
}
|
