Please refer to the x-ray diffraction pattern for polycrystalline alpha-iron bel

Question

Please refer to the x-ray diffraction pattern for polycrystalline alpha-iron below. If x-ray diffraction is performed on iron heated at 400 degree C, describe the changes one might observe in the x-ray pattern. If x-ray diffraction is performed on iron held at a temperature above 1538 degree C, diffraction peaks are 110 longer observed. Please explain what happened to make the peaks disappear, and why this should make the peaks disappear. Hint: the information to figure out what happened is available on the inside front cover of Callister.

Explanation / Answer

a) As the iron is heated there will be thermal expansions which will increase the lattice dimensions this will cause the peaks to shift o lower diffraction angle) b) This is above the melting point of iron as such the iron will be a liquid and not a crystalline material. Thus no peaks.

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