Электронный каталог

Статья

Asadov, A.G.
A Search for Pressure-Induced Phase Transition in the Layered Perovskite-Like Pr&sub(2)Ti&sub(2)O&sub(7) / A.G.Asadov, A.I.Mammadov, D.P.Kozlenko, R.Z.Mehdiyeva, E.V.Lukin, S.E.Kichanov // Journal of Alloys and Compounds [Electronic resource]. – 2024. – Vol. 1003. – P. 175461. – URL: https://doi.org/10.1016/j.jallcom.2024.175461. – Bibliogr.: 36.

In our study, we present comprehensive findings on the structural properties of Pr&sub(2)Ti&sub(2)O&sub(7) across a broad pressure range of 0–30 GPa. Neutron diffraction experiments, conducted under ambient conditions, offer crucial structural insights into the initial monoclinic phase with the P2&sub(1) space group. As pressure increased, a significant phase transition to the monoclinic P2&sub(1)/m phase occurred at 13.8 GPa. Structural data analysis from X-ray diffraction highlights the essence of this transition, identifying it as the tilting of Ti-O&sub(6) octahedra. High-pressure Raman spectroscopy data unequivocally confirms the phase transition, detecting anomalies in the baric dependencies of some vibration modes of Pr&sub(2)Ti&sub(2)O&sub(7) and the emergence of new modes in the Raman spectra within the pressure region associated with the phase transition. The analysis of these novel vibration modes points to alterations in the Ti-O&sub(6) octahedra, emphasizing the pivotal role played by Ti*4*+ and O*2*- ions in the mechanism of the pressure-driven phase transition.



Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
Спец.(статьи,препринты) = С 332.8 - Синхротронное излучение. Лазеры на свободных электронах. Получение и использование рентгеновских лучей
ОИЯИ = ОИЯИ (JINR)2024
Бюллетени = 43/024