1. The problem statement, all variables and given/known data In an examination of a certain element using the Debye-Scherrer technique the following diffraction angles (in degrees) were noted: 45.26/65.92/83.56/100.6/118.68/140.88 Radiation λ=0.1540 nm was used. Obtain two estimates of the atomic diameter of the element in question. a) that obtained assuming the atoms act as contacting hard spheres and b) that obtained from average volume per atom? 2. Relevant equations Braggs law 2*dhklsin θ = nλ (n= 0,1,2....) 3. The attempt at a solution I tried to use Braggs law straight away but didn't get the right result (which is for a) 0.246 nm and for b) 0.280 nm) What am I supposed to do? I found that you are supposed to look ratios of sines squared and determine the lattice in question: http://home.hiram.edu/physics/PHYS340/Debye_Scherrer.pdf [Broken] . I couldn't find the correct lattice and therefore the correct lattice constant. Please help!