Abstract
The frequency of the TA[100] zone-boundary phonon has been measured in rubidium iodide under hydrostatic pressures of 0 to 3.72 kbar by neutron inelastic scattering. A linear fit to the percentage decrease in frequency gives a value of 13.5\ifmmode\pm\else\textpm\fi{}0.9% when extrapolated to the NaCl-CsCl polymorphic transition pressure.
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