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// Chapter 5 Example 4
//==============================================================================
clc;
clear;
//input data
lamda = 1.5418; // wavelength in Å
h = 1; // miller indice
k = 1; // miller indice
l = 1; // miller indice
n = 1; // given first order
theta = 30; // diffraction angle in degrees
// Calculations
theta1 = theta*%pi/180; // degree to radian conversion
// d = (n*lamda)/(2*sinθ); by Braggs law ------------- 1
// d = a/sqrt((h^2)+(k^2)+(l^2)); interplanar distance ------------ 2
// equating 1 and 2
a = (n*lamda*sqrt((h^2)+(k^2)+(l^2))/(2*sin(theta1)))
// Output
mprintf('Interatomic spacing a = %f Å',a);
//==============================================================================
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