1. The effects of high pressure on the crystal structure and vibration spectra of layered perovskite-like Nd2Ti2O7.
- Author
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Asadov, A.G., Mammadov, A.I., Kozlenko, D.P., Mehdiyeva, R.Z., Kichanov, S.E., Lukin, E.V., and Lis, O.N.
- Subjects
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VIBRATIONAL spectra , *PHASE transitions , *CRYSTAL structure , *STRUCTURAL dynamics , *BULK modulus , *PEROVSKITE - Abstract
We had investigated the pressure-induced phase transition phenomenon in the perovskite-like material Nd 2 Ti 2 O 7 compound. The structural and vibrational properties of a layered Nd 2 Ti 2 O 7 have been studied by means of X-ray diffraction and Raman spectroscopy at pressures up to 30 GPa. The gradual structural phase transition from the initial monoclinic P2 1 C 2 2 phase to the monoclinic P2 C 2 1 phase was observed at P ∼ 19 GPa. This pressure-induced phase transition is accompanied by anomalies in the pressure behavior of unit cell parameters and vibrational modes. The role of pressure application as a trigger for a significant rotation of the TiO 6 octahedra, alterations in interatomic distances, and the displacement of Nd atoms were discussed. • Structural and vibration properties of perovskite-like layered Nd 2 Ti 2 O 7 was studied at pressures up to 30 GPa. • The structural phase transition in Nd 2 Ti 2 O 7 was observed at P = 19.2 GPa. • The suppression of the ferroelectric phase of Nd 2 Ti 2 O 7 was discussed. • The bulk modulus of both phases were calculated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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