Abstract
The low-temperature phase transformation in a Li--10 at. % Mg bcc single crystal is investigated by neutron-scattering techniques. A mild phonon softening of the ${\mathrm{TA}}_{1}$[110][11\ifmmode\bar\else\textasciimacron\fi{}0] phonon branch is observed on cooling. This softening is most pronounced at reduced q values near 1/3[110] of the bcc lattice. The close-packed low-temperature phase was found to have the 9R structure over its entire range of stability in contrast to more complicated structural features occurring in the pure alkali metals.
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