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// Scilab Code Ex 1.8 :Page-21 (2006)
clc; clear;
N = 6.023e+23; // Avogadro's number
// For silicon crystallized into diamond structure
a = 5.43e-08; // Lattice parameter of Si, cm
M = 28.1; // Atomic mass of Si, g/mol
n = 8/a^3; // Number of atoms per unit volume, atoms per cm cube
d = n*M/N; // Density of Si crytal, g/cm
printf("\nThe density of crystallized Si = %4.2f gram per cm cube", d);
// For GaAs crystallized into Zinc Blende structure
a = 5.65e-08; // Lattice parameter of GaAs, cm
M_Ga = 69.7; // Atomic weight of Ga, g/mol
M_As = 74.9; // Atomic weight of As, g/mol
M = M_Ga + M_As; // Atomic weight of GaAs, g/mol
n = 4/a^3; // Number of atoms per unit volume, atoms per cm cube
d = n*M/N; // Density of Si crytal, g/cm
printf("\nThe density of crystallized GaAs = %5.3f gram per cm cube", d);
// Result
// The density of crystallized Si = 2.33 gram per cm cube
// The density of crystallized GaAs = 5.324 gram per cm cube 12
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