The first layered analogue of Sr2FeMoO6; the structure and electronic properties of Sr4FeMoO8

E. Cussen, M.F. Thomas

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) Å) and contains a crystallographically disordered arrangement of Fe and Mo on the single octahedral site in the structure. Mössbauer spectroscopy data show that iron is in the trivalent state and that the transition metals are fully disordered at a local scale. SQUID magnetometry measurements and low temperature neutron diffraction experiments have been used to examine the magnetic properties of this material. The magnetic susceptibility shows Curie–Weiss paramagnetism above a magnetic transition at 16(1) K. Below this temperature the sample shows magnetic hysteresis, but the neutron diffraction data show no evidence of the additional Bragg intensity associated with the formation of a magnetically ordered phase. The magnetic transition at 16 K is therefore assigned to the formation of a spin-glass phase. The absence of magnetic order in this material is due to the chemical disorder in the Fe/Mo occupancy of the octahedral site and thus the randomisation of the magnetic exchange interactions.


LanguageEnglish
Pages1084-1089
Number of pages6
JournalJournal of Materials Chemistry
Volume15
DOIs
Publication statusPublished - Jan 2005

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Electronic properties
Neutron diffraction
Paramagnetism
Magnetic hysteresis
Rietveld refinement
Neutron powder diffraction
Spin glass
SQUIDs
Exchange interactions
Mossbauer spectroscopy
Magnetic susceptibility
X ray powder diffraction
Temperature
Transition metals
Magnetic properties
Iron
Experiments
Magnetometry

Keywords

  • Sr2FeMoO6
  • Sr4FeMoO8
  • chemistry
  • materials chemistry

Cite this

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title = "The first layered analogue of Sr2FeMoO6; the structure and electronic properties of Sr4FeMoO8",
abstract = "The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) {\AA}) and contains a crystallographically disordered arrangement of Fe and Mo on the single octahedral site in the structure. M{\"o}ssbauer spectroscopy data show that iron is in the trivalent state and that the transition metals are fully disordered at a local scale. SQUID magnetometry measurements and low temperature neutron diffraction experiments have been used to examine the magnetic properties of this material. The magnetic susceptibility shows Curie–Weiss paramagnetism above a magnetic transition at 16(1) K. Below this temperature the sample shows magnetic hysteresis, but the neutron diffraction data show no evidence of the additional Bragg intensity associated with the formation of a magnetically ordered phase. The magnetic transition at 16 K is therefore assigned to the formation of a spin-glass phase. The absence of magnetic order in this material is due to the chemical disorder in the Fe/Mo occupancy of the octahedral site and thus the randomisation of the magnetic exchange interactions.",
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The first layered analogue of Sr2FeMoO6; the structure and electronic properties of Sr4FeMoO8. / Cussen, E.; Thomas, M.F.

In: Journal of Materials Chemistry, Vol. 15, 01.2005, p. 1084-1089.

Research output: Contribution to journalArticle

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AU - Cussen, E.

AU - Thomas, M.F.

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N2 - The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) Å) and contains a crystallographically disordered arrangement of Fe and Mo on the single octahedral site in the structure. Mössbauer spectroscopy data show that iron is in the trivalent state and that the transition metals are fully disordered at a local scale. SQUID magnetometry measurements and low temperature neutron diffraction experiments have been used to examine the magnetic properties of this material. The magnetic susceptibility shows Curie–Weiss paramagnetism above a magnetic transition at 16(1) K. Below this temperature the sample shows magnetic hysteresis, but the neutron diffraction data show no evidence of the additional Bragg intensity associated with the formation of a magnetically ordered phase. The magnetic transition at 16 K is therefore assigned to the formation of a spin-glass phase. The absence of magnetic order in this material is due to the chemical disorder in the Fe/Mo occupancy of the octahedral site and thus the randomisation of the magnetic exchange interactions.

AB - The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) Å) and contains a crystallographically disordered arrangement of Fe and Mo on the single octahedral site in the structure. Mössbauer spectroscopy data show that iron is in the trivalent state and that the transition metals are fully disordered at a local scale. SQUID magnetometry measurements and low temperature neutron diffraction experiments have been used to examine the magnetic properties of this material. The magnetic susceptibility shows Curie–Weiss paramagnetism above a magnetic transition at 16(1) K. Below this temperature the sample shows magnetic hysteresis, but the neutron diffraction data show no evidence of the additional Bragg intensity associated with the formation of a magnetically ordered phase. The magnetic transition at 16 K is therefore assigned to the formation of a spin-glass phase. The absence of magnetic order in this material is due to the chemical disorder in the Fe/Mo occupancy of the octahedral site and thus the randomisation of the magnetic exchange interactions.

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