A neutron diffraction study and mode analysis of compounds of the system La1−xSrxFeO3−xFx (x=1, 0.8, 0.5, 0.2) and an investigation of their magnetic properties

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A neutron diffraction study and mode analysis of compounds of the system La1−xSrxFeO3−xFx (x=1, 0.8, 0.5, 0.2) and an investigation of their magnetic properties. / Clemens, Oliver; Berry, Frank J.; Wright, Adrian J.; Knight, Kevin S.; Perez-mato, J.m.; Igartua, J.m.; Slater, Peter R.

In: Journal of Solid State Chemistry, Vol. 206, 01.10.2013, p. 158-169.

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@article{255a82c9a1eb419688e15f92fd813ece,
title = "A neutron diffraction study and mode analysis of compounds of the system La1−xSrxFeO3−xFx (x=1, 0.8, 0.5, 0.2) and an investigation of their magnetic properties",
abstract = "We report here a detailed study of the system La1−xSrxFeO3−xFx, by neutron powder diffraction- and magnetic-measurements. All the compounds are robust antiferromagnetics with ordering temperatures well above room temperature. Magnetic moments are shown to align parallel to the c-axis. FC-ZFC measurements indicate a small canting of the magnetic moments, resulting in a ferromagnetic component with a maximum for La0.5Sr0.5FeO2.5F0.5. We show that the system exhibits a composition-driven transition from a phase, for low fluorination levels (x≤0.5), with Pnma symmetry and the usual system of octahedral tiltings, to a phase with space group Imma for higher fluorine contents, where a correlated distortion of the oxygen octahedra plays a significant role. The consistency of the structural models, with respect to the expected continuity of the amplitudes of the different distortion modes and the invariance of their internal form, was monitored through the symmetry mode decomposition of the structures.",
keywords = "Neutron diffraction, Antiferromagnetism, Perovskite, Fluorination, Iron",
author = "Oliver Clemens and Berry, {Frank J.} and Wright, {Adrian J.} and Knight, {Kevin S.} and J.m. Perez-mato and J.m. Igartua and Slater, {Peter R.}",
year = "2013",
month = "10",
day = "1",
doi = "10.1016/j.jssc.2013.08.013",
language = "English",
volume = "206",
pages = "158--169",
journal = "Journal of Solid State Chemistry",
issn = "0022-4596",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A neutron diffraction study and mode analysis of compounds of the system La1−xSrxFeO3−xFx (x=1, 0.8, 0.5, 0.2) and an investigation of their magnetic properties

AU - Clemens, Oliver

AU - Berry, Frank J.

AU - Wright, Adrian J.

AU - Knight, Kevin S.

AU - Perez-mato, J.m.

AU - Igartua, J.m.

AU - Slater, Peter R.

PY - 2013/10/1

Y1 - 2013/10/1

N2 - We report here a detailed study of the system La1−xSrxFeO3−xFx, by neutron powder diffraction- and magnetic-measurements. All the compounds are robust antiferromagnetics with ordering temperatures well above room temperature. Magnetic moments are shown to align parallel to the c-axis. FC-ZFC measurements indicate a small canting of the magnetic moments, resulting in a ferromagnetic component with a maximum for La0.5Sr0.5FeO2.5F0.5. We show that the system exhibits a composition-driven transition from a phase, for low fluorination levels (x≤0.5), with Pnma symmetry and the usual system of octahedral tiltings, to a phase with space group Imma for higher fluorine contents, where a correlated distortion of the oxygen octahedra plays a significant role. The consistency of the structural models, with respect to the expected continuity of the amplitudes of the different distortion modes and the invariance of their internal form, was monitored through the symmetry mode decomposition of the structures.

AB - We report here a detailed study of the system La1−xSrxFeO3−xFx, by neutron powder diffraction- and magnetic-measurements. All the compounds are robust antiferromagnetics with ordering temperatures well above room temperature. Magnetic moments are shown to align parallel to the c-axis. FC-ZFC measurements indicate a small canting of the magnetic moments, resulting in a ferromagnetic component with a maximum for La0.5Sr0.5FeO2.5F0.5. We show that the system exhibits a composition-driven transition from a phase, for low fluorination levels (x≤0.5), with Pnma symmetry and the usual system of octahedral tiltings, to a phase with space group Imma for higher fluorine contents, where a correlated distortion of the oxygen octahedra plays a significant role. The consistency of the structural models, with respect to the expected continuity of the amplitudes of the different distortion modes and the invariance of their internal form, was monitored through the symmetry mode decomposition of the structures.

KW - Neutron diffraction

KW - Antiferromagnetism

KW - Perovskite

KW - Fluorination

KW - Iron

U2 - 10.1016/j.jssc.2013.08.013

DO - 10.1016/j.jssc.2013.08.013

M3 - Article

VL - 206

SP - 158

EP - 169

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

ER -