Work

Subtle Structural Changes in LaFeO3 at High Pressure

Year: 2020

Type: article

Abstract: High‐pressure neutron diffraction measurements of polycrystalline LaFeO3 are collected up to 5.5 and 6.4 GPa at 290 and 110 K, respectively. The bulk moduli are determined as B0(290 K) = 170(3) GPa and B0(110 K) = 175(1) GPa. The unit cell is found to compress anisotropically at both temperatures with the a‐axis compressing preferentially. A crossover in lattice parameters is observed, from a > c to c > a, at 2 GPa at 290 K and at 1.7 GPa at 110 K. The magnetic moment remains unchanged over the pressure range investigated, with a value of 4.4 μB and 4 μB at 110 and 290 K, respectively. Analysis of the octahedral tilting angles and the spontaneous lattice strains shows an increased orthorhombic distortion with pressure, but shows no trend toward a change in symmetry. High‐pressure Raman spectroscopy measurements at room temperature are in agreement with the diffraction data.

Source: physica status solidi (b)

DOI: 10.1002/pssb.202000413

Authors: Mara Capone, Christopher J. Ridley, Nicholas P. Funnell, Malcolm Guthrie, Craig L. Bull

Institutions: Rutherford Appleton Laboratory, European Spallation Source, ISIS Neutron and Muon Source, University of Edinburgh

Language: English

Topic: High-pressure geophysics and materials

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,800

Funders: Science and Technology Facilities Council, ISIS Neutron and Muon Source