FAST ION CONDUCTORS.Quasielastic neutron scattering from a single crystal of α-AgI

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Abstract
A first report is given on a quasielastic neutron scattering experiment performed on a large single crystal of α-AgI. Time-of-flight spectra were taken at 250 °C, under different orientations of the crystal. The range of wavevector transfer was 1,0 Å-1 ≤≈ | Q0 | ≤≈ 1,8 Å-1 for elastic scattering. As in the case of polycrystalline material the spectra typically consist of a broad plus a narrow quasielastic component. The narrow line shows pronounced anisotropy, reflecting the anisotropy of translational diffusion paths via tetrahedral voids. The broad wings of the spectra are essentially isotropic and correspond to an irregular local motion

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