We report the existence of a reversible first-order phase transition of BeS from the zinc-blende structure, $B3,$ to the nickel-arsenide structure, $B8,$ at 51 GPa with a volume change of 11%. The NiAs phase remains stable up to at least 96 GPa. A second-order Birch equation describes the equation of state of the $B3$ phase with Bₒ=105GPa and Bₒ^'=3.5. Preliminary studies of BeO to 66 GPa are described.
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Narayana et al. (1997) studied this question.
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