Single-crystal neutron diffraction provides a powerful complementary probe to X-ray diffraction for the characterization of earth materials. The ability of neutron diffraction to determine the position of the atomic nucleus rather than electron density is key to its use in structural studies. A typical neutron beam spectrum contains neutrons in the energy ranges of epithermal, hot, thermal and cold. The relation between the neutron kinetic energy and the wavelength is:

\[\mathit{E}\ =\ \frac{1}{2}\mathit{mv}^{2}\ =\ \left(\frac{{\hbar}^{2}2{\pi}^{2}}{\mathit{m}}\right)\frac{1}{{\lambda}^{2}}{\ }{\ }(de-Broglie)\]

where m is the neutron mass and v is the velocity. This can be transformed in (1) via de Broglie using the...

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