The effects of high pressure on the crystal structure and vibration spectra of layered perovskite-like Nd2Ti2O7

被引：6
|
作者：
Asadov, A. G. [1 ,2 ,3 ]
Mammadov, A. I. [2 ]
Kozlenko, D. P. [1 ]
Mehdiyeva, R. Z. [2 ]
Kichanov, S. E. [1 ]
Lukin, E. V. [1 ]
Lis, O. N. [1 ,4 ]
机构：
[1] JINR, Frank Lab Neutron Phys, Dubna 141980, Russia
[2] Minist Sci & Educ Republ Azerbaijan, Inst Phys, AZ-1143 Baku, Azerbaijan
[3] Khazar Univ, AZ-1096 Baku, Azerbaijan
[4] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia
来源：
SOLID STATE IONICS | 2024年 / 406卷
关键词：
High pressure; X-ray diffraction; Raman spectroscopy; Neutron diffraction; Perovskites; RUTILE TIO2; LA2TI2O7;
D O I：
10.1016/j.ssi.2023.116447
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We had investigated the pressure-induced phase transition phenomenon in the perovskite-like material Nd2Ti2O7 compound. The structural and vibrational properties of a layered Nd2Ti2O7 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 P21 ( C2) phase to the monoclinic P2 ( C1) phase was observed at P - 19 GPa. This pressureinduced 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 TiO6 octahedra, alterations in interatomic distances, and the displacement of Nd atoms were discussed.
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页数：7
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