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.

引用

页数：7

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