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Quasielastic neutron scattering is used to study the disordering processes in two classes of semiconductors: I–IV Zintl compounds and the phosphorous—selenium system. Two alkali-metal-polyvalent metal Zintl compounds, CsPb and NaSn, exhibit a two-stage melting process with high-temperature solid phases characterized by rapid dynamical disorder. In CsPb this disorder is clearly associated with rapid...
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