Abstract
The shape of the fundamental optical absorption edge as well as its temperature and pressure dependences in the vicinity of phase transitions in (Sn 0.95 Zn 0.05 )2P 2 S 6 ferroelectric crystals are studied. The (p,T) phase diagram of (Sn 0.95 Zn 0.05 ) 2 P 2 S 6 crystals has been proposed based on these data.
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