https://doi.org/10.1140/epjb/s10051-022-00291-3
Regular Article - Solid State and Materials
Lattice stability of nickel titanate under high pressure up to 30.3 GPa
1
Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi, People’s Republic of China
2
School of Physics and Technology, Xinjiang University, Urumqi, People’s Republic of China
Received:
12
November
2021
Accepted:
25
January
2022
Published online:
14
February
2022
Studying the lattice stability of ilmenite-type compounds under extreme conditions such as high temperature and high pressure is of great significance both for understanding the intrinsic mechanism of structural transformations between various forms of ABO3 compounds and for guiding the design of functional materials. Herein, lattice transformations of ilmenite-type compounds represented by nickel titanate (NiTiO3) have been studied by using in-situ high-pressure Raman spectroscopy up to 30.3 GPa for the first time. No phase transitions have been observed in the studied pressure range. However, our data clearly show a structural distortion in the local cationic octahedron-NiO6 of NiTiO3 starting at 15 GPa, which has resulted from the pressure-induced Jahn–Teller effect. Our data also indicate the ilmenite structure NiTiO3 to become more symmetrical under high pressure, and we did not find any amorphization up to 30.3 GPa. This research provides basic information on the ilmenite NiTiO3 structure that it is more stable than other analog ilmenite structures previously studied by other researchers.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
