Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO 6 (A=Ca, Sr, Ba) double perovskite oxides

A. A. Elbadawi, O. A. Yassin, Abbasher A. Gismelseed

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8 Citations (Scopus)

Abstract

Successful preparation of double perovskite oxides of chemical formula ALaFeTiO 6 (A=Ba, Sr and Ca) has been achieved by following the precursor method. The samples were studied by means of X-ray diffraction and Mössbauer spectroscopy. The Rietveld analysis of the X-ray diffraction data showed that all the samples have anti-site disorder. The presence of anti-site disorder has altered the electronic environment around the Fe ion sites which creates electric field gradient between two different sites. Observation of quadruple splitting in the ideal cubic perovskite BaLaFeTiO 6 (its tolerance factor equals 1) is the evidence of this anti-site generated electric field gradient. The valence state of the Fe atom determined from the measurements of the Mössbauer effect of 57Fe at room temperature and 80 K showed that the iron ion has the Fe 3+ high spin state as extracted from the values of the isomer shift for all the samples. It is evidenced that the anti-site disorder has no appreciable effect on the spin state of the Fe ion, but alters the charge densities at the Fe sites and influences the hyperfine parameters of the present samples. Weak ferromagnetism is observed in CaLaFeTiO 6 and SrLaFeTiO 6 and is related to both the internal pressure and the anti-site effect which facilitate the occurrence of the Fe 3+↑-O-Fe 3+↓ antiferromagnetic interaction with canted spin.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume326
DOIs
Publication statusPublished - Jan 2013

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internal pressure
Perovskite
Oxides
Magnetic properties
disorders
Ions
magnetic properties
oxides
Electric fields
Rietveld analysis
X ray diffraction
Ferromagnetism
Charge density
Isomers
gradients
ions
electric fields
Iron
diffraction
Spectroscopy

Keywords

  • Anti-site disorder
  • Cation mismatch
  • Double perovskites
  • Mössbauer spectroscopy
  • Quadruple splitting
  • Rietveld refinement

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO 6 (A=Ca, Sr, Ba) double perovskite oxides",
abstract = "Successful preparation of double perovskite oxides of chemical formula ALaFeTiO 6 (A=Ba, Sr and Ca) has been achieved by following the precursor method. The samples were studied by means of X-ray diffraction and M{\"o}ssbauer spectroscopy. The Rietveld analysis of the X-ray diffraction data showed that all the samples have anti-site disorder. The presence of anti-site disorder has altered the electronic environment around the Fe ion sites which creates electric field gradient between two different sites. Observation of quadruple splitting in the ideal cubic perovskite BaLaFeTiO 6 (its tolerance factor equals 1) is the evidence of this anti-site generated electric field gradient. The valence state of the Fe atom determined from the measurements of the M{\"o}ssbauer effect of 57Fe at room temperature and 80 K showed that the iron ion has the Fe 3+ high spin state as extracted from the values of the isomer shift for all the samples. It is evidenced that the anti-site disorder has no appreciable effect on the spin state of the Fe ion, but alters the charge densities at the Fe sites and influences the hyperfine parameters of the present samples. Weak ferromagnetism is observed in CaLaFeTiO 6 and SrLaFeTiO 6 and is related to both the internal pressure and the anti-site effect which facilitate the occurrence of the Fe 3+↑-O-Fe 3+↓ antiferromagnetic interaction with canted spin.",
keywords = "Anti-site disorder, Cation mismatch, Double perovskites, M{\"o}ssbauer spectroscopy, Quadruple splitting, Rietveld refinement",
author = "Elbadawi, {A. A.} and Yassin, {O. A.} and Gismelseed, {Abbasher A.}",
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T1 - Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO 6 (A=Ca, Sr, Ba) double perovskite oxides

AU - Elbadawi, A. A.

AU - Yassin, O. A.

AU - Gismelseed, Abbasher A.

PY - 2013/1

Y1 - 2013/1

N2 - Successful preparation of double perovskite oxides of chemical formula ALaFeTiO 6 (A=Ba, Sr and Ca) has been achieved by following the precursor method. The samples were studied by means of X-ray diffraction and Mössbauer spectroscopy. The Rietveld analysis of the X-ray diffraction data showed that all the samples have anti-site disorder. The presence of anti-site disorder has altered the electronic environment around the Fe ion sites which creates electric field gradient between two different sites. Observation of quadruple splitting in the ideal cubic perovskite BaLaFeTiO 6 (its tolerance factor equals 1) is the evidence of this anti-site generated electric field gradient. The valence state of the Fe atom determined from the measurements of the Mössbauer effect of 57Fe at room temperature and 80 K showed that the iron ion has the Fe 3+ high spin state as extracted from the values of the isomer shift for all the samples. It is evidenced that the anti-site disorder has no appreciable effect on the spin state of the Fe ion, but alters the charge densities at the Fe sites and influences the hyperfine parameters of the present samples. Weak ferromagnetism is observed in CaLaFeTiO 6 and SrLaFeTiO 6 and is related to both the internal pressure and the anti-site effect which facilitate the occurrence of the Fe 3+↑-O-Fe 3+↓ antiferromagnetic interaction with canted spin.

AB - Successful preparation of double perovskite oxides of chemical formula ALaFeTiO 6 (A=Ba, Sr and Ca) has been achieved by following the precursor method. The samples were studied by means of X-ray diffraction and Mössbauer spectroscopy. The Rietveld analysis of the X-ray diffraction data showed that all the samples have anti-site disorder. The presence of anti-site disorder has altered the electronic environment around the Fe ion sites which creates electric field gradient between two different sites. Observation of quadruple splitting in the ideal cubic perovskite BaLaFeTiO 6 (its tolerance factor equals 1) is the evidence of this anti-site generated electric field gradient. The valence state of the Fe atom determined from the measurements of the Mössbauer effect of 57Fe at room temperature and 80 K showed that the iron ion has the Fe 3+ high spin state as extracted from the values of the isomer shift for all the samples. It is evidenced that the anti-site disorder has no appreciable effect on the spin state of the Fe ion, but alters the charge densities at the Fe sites and influences the hyperfine parameters of the present samples. Weak ferromagnetism is observed in CaLaFeTiO 6 and SrLaFeTiO 6 and is related to both the internal pressure and the anti-site effect which facilitate the occurrence of the Fe 3+↑-O-Fe 3+↓ antiferromagnetic interaction with canted spin.

KW - Anti-site disorder

KW - Cation mismatch

KW - Double perovskites

KW - Mössbauer spectroscopy

KW - Quadruple splitting

KW - Rietveld refinement

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