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- W2055243359 abstract "Abstract Barium metaborate crystal is studied in the temperature range 25–400°C, corresponding to the low to the high temperature phases. The spectra reveal that as the temperature rises, the frequencies of the internal modes are unaffected. However, those of the lattice modes decrease slightly by about 3 cm −1 . The results also show that the phase transition occurs over a wide temperature range with no significant spectroscopic changes as the temperature rises except the enhancement of the translational mode of Ba 2+ ions at 86 cm −1 . Most of the enhanced intensity is of E symmetry. The enhancement is most drastic around 217 and 317°C. It is interpreted that the phase transition is mainly due to the rearrangement of the Ba 2+ ions in the crystal. As the temperature rises, more Ba 2+ ions are shifted to the sites of C 3 and D 3 symmetries. The role of the Ba 2+ ion is also discussed along with its relationship with the second harmonic generating property of the low temperature phase, i.e. the β -barium metaborate crystal." @default.
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- W2055243359 date "1987-01-01" @default.
- W2055243359 modified "2023-10-17" @default.
- W2055243359 title "Temperature dependent Raman study of barium metaborate crystal" @default.
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- W2055243359 doi "https://doi.org/10.1016/s0584-8539(87)80022-3" @default.
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