Structural, 57Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd0.33Eu0.67Fe1-xCrxO3 particles

K. S. Al-Rashdi; H. M. Widatallah; M. E. Elzain; A. M. Gismelseed; A. D. Al-Rawas; M. T.Z. Myint; F. S. Al Mawali; S. H. Al-Harthi; E. A. Moore; E. M. Crabb

doi:10.1016/j.materresbull.2020.111004

Structural, ⁵⁷Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd_0.33Eu_0.67Fe_1-_xCr_xO₃ particles

K. S. Al-Rashdi, H. M. Widatallah^*, M. E. Elzain, A. M. Gismelseed, A. D. Al-Rawas, M. T.Z. Myint, F. S. Al Mawali, S. H. Al-Harthi, E. A. Moore, E. M. Crabb

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report on the structure and surface composition of Nd_0.33Eu_0.67Fe_1-xCr_xO₃ (x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1.0) nanoparticles (∼30 nm) mechanosynthesized at temperatures that are ∼ 470–700 °C lower than those at which the pure and doped pristine materials conventionally form. XRD Rietveld and FT-IR analyses show that with increasing x the lattice parameters decrease and the bond lengths and angles vary in a way that reduces crystalline distortion. Whilst the majority of the Eu³⁺/Nd³⁺ and Fe³⁺/Cr³⁺ cations occupy their normal perovskite-related A- and B-sites, respectively, ∼ 5 % of them exchange sites. ⁵⁷Fe Mössbauer spectroscopy favours the presence of these antisites and reveals a superparamagnetic behaviour at 298 K that enhances with increasing x. XPS measurement reveals a complex surface composition of the nanoparticles with traces of Eu₂O₃, Nd₂O₃, Cr₂O₃ and Fe₂O₃ as well as partial O²⁻-deficiency.

Original language	English
Article number	111004
Journal	Materials Research Bulletin
Volume	132
DOIs	https://doi.org/10.1016/j.materresbull.2020.111004
Publication status	Published - Dec 2020

Keywords

Mechanosynthesis
Mössbauer spectroscopy
Orthoferrites
XPS
XRD

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.materresbull.2020.111004

Cite this

Al-Rashdi, K. S., Widatallah, H. M., Elzain, M. E., Gismelseed, A. M., Al-Rawas, A. D., Myint, M. T. Z., Al Mawali, F. S., Al-Harthi, S. H., Moore, E. A., & Crabb, E. M. (2020). Structural, ⁵⁷Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd_0.33Eu_0.67Fe_1-_xCr_xO₃ particles. Materials Research Bulletin, 132, [111004]. https://doi.org/10.1016/j.materresbull.2020.111004

@article{742a5790d13840618825cbdbf860e85c,

title = "Structural, 57Fe M{\"o}ssbauer and XPS studies of mechanosynthesized nanocrystalline Nd0.33Eu0.67Fe1-xCrxO3 particles",

abstract = "We report on the structure and surface composition of Nd0.33Eu0.67Fe1-xCrxO3 (x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1.0) nanoparticles (∼30 nm) mechanosynthesized at temperatures that are ∼ 470–700 °C lower than those at which the pure and doped pristine materials conventionally form. XRD Rietveld and FT-IR analyses show that with increasing x the lattice parameters decrease and the bond lengths and angles vary in a way that reduces crystalline distortion. Whilst the majority of the Eu3+/Nd3+ and Fe3+/Cr3+ cations occupy their normal perovskite-related A- and B-sites, respectively, ∼ 5 % of them exchange sites. 57Fe M{\"o}ssbauer spectroscopy favours the presence of these antisites and reveals a superparamagnetic behaviour at 298 K that enhances with increasing x. XPS measurement reveals a complex surface composition of the nanoparticles with traces of Eu2O3, Nd2O3, Cr2O3 and Fe2O3 as well as partial O2−-deficiency.",

keywords = "Mechanosynthesis, M{\"o}ssbauer spectroscopy, Orthoferrites, XPS, XRD",

author = "Al-Rashdi, {K. S.} and Widatallah, {H. M.} and Elzain, {M. E.} and Gismelseed, {A. M.} and Al-Rawas, {A. D.} and Myint, {M. T.Z.} and {Al Mawali}, {F. S.} and Al-Harthi, {S. H.} and Moore, {E. A.} and Crabb, {E. M.}",

note = "Funding Information: (KSA) thanks Sultan Qaboos University (SQU) for a PhD scholarship. (HMW) would like to thank SQU for the research grant IG/SCI/PHYS/16/04 and the Open University, Milton Keynes, UK for a research visit during which the manuscript has been completed. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2020",

month = dec,

doi = "10.1016/j.materresbull.2020.111004",

language = "English",

volume = "132",

journal = "Materials Research Bulletin",

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T1 - Structural, 57Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd0.33Eu0.67Fe1-xCrxO3 particles

AU - Al-Rashdi, K. S.

AU - Widatallah, H. M.

AU - Elzain, M. E.

AU - Gismelseed, A. M.

AU - Al-Rawas, A. D.

AU - Myint, M. T.Z.

AU - Al Mawali, F. S.

AU - Al-Harthi, S. H.

AU - Moore, E. A.

AU - Crabb, E. M.

N1 - Funding Information: (KSA) thanks Sultan Qaboos University (SQU) for a PhD scholarship. (HMW) would like to thank SQU for the research grant IG/SCI/PHYS/16/04 and the Open University, Milton Keynes, UK for a research visit during which the manuscript has been completed. Publisher Copyright: © 2020 Elsevier Ltd

PY - 2020/12

Y1 - 2020/12

N2 - We report on the structure and surface composition of Nd0.33Eu0.67Fe1-xCrxO3 (x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1.0) nanoparticles (∼30 nm) mechanosynthesized at temperatures that are ∼ 470–700 °C lower than those at which the pure and doped pristine materials conventionally form. XRD Rietveld and FT-IR analyses show that with increasing x the lattice parameters decrease and the bond lengths and angles vary in a way that reduces crystalline distortion. Whilst the majority of the Eu3+/Nd3+ and Fe3+/Cr3+ cations occupy their normal perovskite-related A- and B-sites, respectively, ∼ 5 % of them exchange sites. 57Fe Mössbauer spectroscopy favours the presence of these antisites and reveals a superparamagnetic behaviour at 298 K that enhances with increasing x. XPS measurement reveals a complex surface composition of the nanoparticles with traces of Eu2O3, Nd2O3, Cr2O3 and Fe2O3 as well as partial O2−-deficiency.

AB - We report on the structure and surface composition of Nd0.33Eu0.67Fe1-xCrxO3 (x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1.0) nanoparticles (∼30 nm) mechanosynthesized at temperatures that are ∼ 470–700 °C lower than those at which the pure and doped pristine materials conventionally form. XRD Rietveld and FT-IR analyses show that with increasing x the lattice parameters decrease and the bond lengths and angles vary in a way that reduces crystalline distortion. Whilst the majority of the Eu3+/Nd3+ and Fe3+/Cr3+ cations occupy their normal perovskite-related A- and B-sites, respectively, ∼ 5 % of them exchange sites. 57Fe Mössbauer spectroscopy favours the presence of these antisites and reveals a superparamagnetic behaviour at 298 K that enhances with increasing x. XPS measurement reveals a complex surface composition of the nanoparticles with traces of Eu2O3, Nd2O3, Cr2O3 and Fe2O3 as well as partial O2−-deficiency.

KW - Mechanosynthesis

KW - Mössbauer spectroscopy

KW - Orthoferrites

KW - XPS

KW - XRD

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