Abstract
Abstract A high-pressure Raman study of β-BaB 2 O 4 reveals the occurrence of four pressure-induced phase transitions near 48, 70, 80 and 96 kbar, respectively. Above 96 kbar, β-BaB 2 O 4 becomes amorphous and the transition is irreversible. A Raman quartet originating from Davydov splitting and the pressure-scanned Fermi resonance effect is observed.
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