The crystallographic and magnetic characteristics of Sr2CrO4 (K2NiF4-type) and Sr10(CrO4)6F2 (apatite-type)

Tom Baikie; Zahara Ahmad; Madhavi Srinivasan; Antoine Maignan; Stevin S. Pramana; T. J. White

doi:10.1016/j.jssc.2007.02.023

The crystallographic and magnetic characteristics of Sr₂CrO₄ (K₂NiF₄-type) and Sr₁₀(CrO₄)₆F₂ (apatite-type)

Tom Baikie^*, Zahara Ahmad, Madhavi Srinivasan, Antoine Maignan, Stevin S. Pramana, T. J. White

^*Corresponding author for this work

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

25 Citations (Scopus)

Abstract

Solid-state reaction between SrCO₃, Cr₂O₃ and SrF₂ has produced the apatite phase Sr₁₀(CrO₄)₆F₂ and Sr₂CrO₄ which adopts the K₂NiF₄-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr₂CrO₄, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr₂CrO₄ adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) Å and c=12.7169(1) Å, while a combination of neutron and X-ray diffraction verified Sr₁₀(CrO₄)₆F₂ is hexagonal (space group P6₃/m) with lattice parameters a=9.9570(1) Å and c=7.4292(1) Å. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases.

Original language	English
Pages (from-to)	1538-1546
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	5
DOIs	https://doi.org/10.1016/j.jssc.2007.02.023
Publication status	Published - May 2007
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Keywords

Apatite
Chromate
Electron diffraction
Powder X-ray/neutron diffraction
Ruddlesden-Popper
XPS

Access to Document

10.1016/j.jssc.2007.02.023

Cite this

@article{4696ca35ec364acf95c111dfa539400f,

title = "The crystallographic and magnetic characteristics of Sr2CrO4 (K2NiF4-type) and Sr10(CrO4)6F2 (apatite-type)",

abstract = "Solid-state reaction between SrCO3, Cr2O3 and SrF2 has produced the apatite phase Sr10(CrO4)6F2 and Sr2CrO4 which adopts the K2NiF4-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr2CrO4, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr2CrO4 adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) {\AA} and c=12.7169(1) {\AA}, while a combination of neutron and X-ray diffraction verified Sr10(CrO4)6F2 is hexagonal (space group P63/m) with lattice parameters a=9.9570(1) {\AA} and c=7.4292(1) {\AA}. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases.",

keywords = "Apatite, Chromate, Electron diffraction, Powder X-ray/neutron diffraction, Ruddlesden-Popper, XPS",

author = "Tom Baikie and Zahara Ahmad and Madhavi Srinivasan and Antoine Maignan and Pramana, {Stevin S.} and White, {T. J.}",

year = "2007",

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language = "English",

volume = "180",

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T1 - The crystallographic and magnetic characteristics of Sr2CrO4 (K2NiF4-type) and Sr10(CrO4)6F2 (apatite-type)

AU - Baikie, Tom

AU - Ahmad, Zahara

AU - Srinivasan, Madhavi

AU - Maignan, Antoine

AU - Pramana, Stevin S.

AU - White, T. J.

PY - 2007/5

Y1 - 2007/5

N2 - Solid-state reaction between SrCO3, Cr2O3 and SrF2 has produced the apatite phase Sr10(CrO4)6F2 and Sr2CrO4 which adopts the K2NiF4-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr2CrO4, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr2CrO4 adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) Å and c=12.7169(1) Å, while a combination of neutron and X-ray diffraction verified Sr10(CrO4)6F2 is hexagonal (space group P63/m) with lattice parameters a=9.9570(1) Å and c=7.4292(1) Å. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases.

AB - Solid-state reaction between SrCO3, Cr2O3 and SrF2 has produced the apatite phase Sr10(CrO4)6F2 and Sr2CrO4 which adopts the K2NiF4-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr2CrO4, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr2CrO4 adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) Å and c=12.7169(1) Å, while a combination of neutron and X-ray diffraction verified Sr10(CrO4)6F2 is hexagonal (space group P63/m) with lattice parameters a=9.9570(1) Å and c=7.4292(1) Å. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases.

KW - Apatite

KW - Chromate

KW - Electron diffraction

KW - Powder X-ray/neutron diffraction

KW - Ruddlesden-Popper

KW - XPS

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