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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 15: Metallic and Ionic solids"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.1_e: example_1.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//Initialization of variables\n",
+"Hs=89 //kJ/mol\n",
+"HI=418 //kJ/mol\n",
+"HD=244 //kJ/mol\n",
+"HE=-349 //kJ/mol\n",
+"Hf=-437 //kJ/mol\n",
+"//calculations\n",
+"HL=Hs+HD/2 +HI+HE-Hf\n",
+"//results\n",
+"printf('Lattice energy = %d kJ/mol',HL)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.2_e: example_2.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//Initialization of variables\n",
+"a=0.82 //nm\n",
+"b=0.94 //nm\n",
+"c=0.75 //nm\n",
+"h=1\n",
+"k=2\n",
+"l=3\n",
+"//calculations\n",
+"invd=sqrt(h*h/(a*a) + k*k/(b*b) + l*l/(c*c))\n",
+"d=1/invd\n",
+"invd2=sqrt(h*h*4/(a*a) + k*k*4/(b*b) + l*l*4/(c*c))\n",
+"d2=1/invd2\n",
+"//results\n",
+"printf('In case 1, separation = %.2f nm',d)\n",
+"printf('\n In case 2, separation = %.2f nm',d2)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.3_e: example_3.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//Initialization of variables\n",
+"l=154 //pm\n",
+"theta=11.2 //degrees\n",
+"//calculations\n",
+"d=l/(2*sind(theta))\n",
+"a=d*sqrt(3)\n",
+"//results\n",
+"printf('Length of the side of the unit cell = %d pm',a+1)"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}