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// Scilab Code Ex 1.9 :Page-21 (2006)
clc; clear;
N = 6.023e+23; // Avogadro's number
r1 = 0.122e-09; // Ionic radii of Ga, m
r2 = 0.125e-09; // Ionic radii of As, m
r3 = 0.11e-09; // Ionic radii of P, m
// For GaP
r = r1 + r3; // Interatomic separation between Ga and P atoms, m
a = 4*r/3^(1/2); // Lattice parameter of GaP structure, m
printf("\nThe lattice parameter of GaP structure = %5.3f angstrom", a/1e-10);
// For GaAs
r = r1 + r2; // Interatomic separation between Ga and As atoms, m
a = 4*r/3^(1/2); // Lattice parameter of GaP structure, m
printf("\nThe lattice parameter of GaAs structure = %4.2f angstrom", a/1e-10);
// Result
// The lattice parameter of GaP structure = 5.358 angstrom
// The lattice parameter of GaAs structure = 5.70 angstrom
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