Lattice dynamics of NiTiO3 under high pressure: Raman evidence under two pressure-transmitting mediums
Wenming Qi, Abliz Mattursun, Min Gao, Anwar Hushur, Hongyan Zhang
Abstract
Ilmenite-type NiTiO3 has been studied by Raman spectroscopy under hydrostatic and non-hydrostatic pressure. The rhombohedral structure does not undergo phase transitions up to 35 GPa but evidence of it is found under non-hydrostatic pressure at 45 GPa. The pressure evolution of different modes will be discussed in detail. Our findings not only provide direct experimental evidence of difference in the lattice of NiTiO3 between hydrostatic and non-hydrostatic conditions, but also offer a new insight to understand the phase stability region of ilmenite minerals in the deep earth.
Topics & Concepts
IlmeniteRaman spectroscopyHydrostatic pressureHydrostatic equilibriumPhase transitionLattice (music)Condensed matter physicsInstabilityMaterials scienceHigh pressureGeologyMineralogyThermodynamicsPhysicsOpticsMechanicsQuantum mechanicsAcousticsHigh-pressure geophysics and materialsGeological and Geochemical AnalysisCrystal Structures and Properties