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High pressure ferroelectric-like semi-metallic state in Eu-doped BaTiO3. | LitMetric

High pressure ferroelectric-like semi-metallic state in Eu-doped BaTiO3.

J Chem Phys

National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur Campus, Mohanpur, 741246 Nadia, West Bengal, India.

Published: September 2024

AI Article Synopsis

  • - We studied Eu-doped BaTiO3 under high pressure using x-ray diffraction, Raman spectroscopy, and dielectric measurements, finding a structural change above 1.4 GPa from tetragonal to mixed cubic and tetragonal phases.
  • - The presence of Eu affects the internal structure of TiO6 octahedra, which doesn't change under pressure, and the Raman analysis indicates a transition from a ferroelectric phase to a paraelectric phase.
  • - Our results also show that the material experiences localized regions of ferroelectric ordering under high pressure, resulting in a ferroelectric-like semi-metallic state, marking an interesting coexistence of phases.

Article Abstract

We have conducted a detailed high-pressure (HP) investigation on Eu-doped BaTiO3 using angle-resolved x-ray diffraction, Raman spectroscopy, and dielectric permittivity measurements. The x-ray diffraction data analysis shows a pressure-induced structural phase transition from the ambient tetragonal to the mixed cubic and tetragonal phases above 1.4 GPa. The tetragonality of the sample due to the internal deformation of the TiO6 octahedra caused by the charge difference from Eu doping cannot be lifted by pressure. Softening, weakening, and disappearance of low-frequency Raman modes indicate ferroelectric tetragonal to the paraelectric cubic phase transition. However, the pressure-induced increase in the intensity of [E(LO), A1(LO)] and the octahedral breathing modes indicate that the local structural inhomogeneity remains in the crystal and is responsible for spontaneous polarization in the sample. The low-frequency electronic scattering response suggests pressure-induced carrier delocalization, leading to a semi-metallic state in the system. Our HP dielectric constant data can be explained by the presence of pressure-induced localized clusters of microscopic ferroelectric ordering. Our results suggest that the HP phase coexistence leads to a ferroelectric-like semi-metallic state in Eu-doped BaTiO3 under extreme quantum limits.

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Source
http://dx.doi.org/10.1063/5.0204542DOI Listing

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