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Subtle Structural Changes in LaFeO 3 at High Pressure
Author(s) -
Capone Mara,
Ridley Christopher J.,
Funnell Nicholas P.,
Guthrie Malcolm,
Bull Craig L.
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000413
Subject(s) - orthorhombic crystal system , raman spectroscopy , materials science , neutron diffraction , crystallite , diffraction , crystallography , octahedron , bulk modulus , lattice (music) , analytical chemistry (journal) , crystal structure , condensed matter physics , chemistry , optics , physics , composite material , acoustics , chromatography
High‐pressure neutron diffraction measurements of polycrystalline LaFeO 3 are collected up to 5.5 and 6.4 GPa at 290 and 110 K, respectively. The bulk moduli are determined as B 0 (290 K) = 170(3) GPa and B 0 (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  μ B and 4  μ B 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.

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