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(Color online) Schematic crystal structure of tetragonal , the large balls represent Bi ions and the others are CuO4 square-planar units.
(Color online) Raman spectrum of measured at room conditions.
(Color online) (a) Raman spectra of at various pressures. (b) Pressure dependence of the shifts of Raman active modes for . The solid symbols in (b) below are measured during the unloading process.
Positions of the observed Raman active modes for tetragonal at room conditions and frequency shifts with pressure.
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