Neutrons are powerful probes of nuclear and magnetic structure of condensed matter, and of lattice dynamics. Many of the unique properties of the neutron (shown in Tables 11 and 22) have no equivalent in X-ray studies (Bacon 1962). Neutrons are important in locating light atoms such as hydrogen and lithium and to study the diffusion of hydrogenous molecules. With some exceptions, they easily distinguish neighboring elements in the periodic table, such as Mg/Al and Si/Al for example, which are indistinguishable with X-rays. Neutrons are particularly well suited to investigations taking advantage of isotope substitution, since...

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