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Title: The crystallographic and magnetic characteristics of Sr{sub 2}CrO{sub 4} (K{sub 2}NiF{sub 4}-type) and Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} (apatite-type)

Abstract

Solid-state reaction between SrCO{sub 3}, Cr{sub 2}O{sub 3} and SrF{sub 2} has produced the apatite phase Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} and Sr{sub 2}CrO{sub 4} which adopts the K{sub 2}NiF{sub 4}-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr{sub 2}CrO{sub 4}, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr{sub 2}CrO{sub 4} adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) A and c=12.7169(1) A, while a combination of neutron and X-ray diffraction verified Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} is hexagonal (space group P6{sub 3}/m) with lattice parameters a=9.9570(1) A and c=7.4292(1) A. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases. - Graphical abstract: A solid-state reaction between SrCO{sub 3}, Cr{sub 2}O{sub 3} and SrF{sub 2} produced Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} apatite and Sr{sub 2}CrO{sub 4} which adopts the K{sub 2}NiF{sub 4}-type structure. Powder X-ray and electron diffraction confirmed that Sr{sub 2}CrO{sub 4} is body-centred tetragonal, while a combination of neutron and X-ray diffraction verified Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} ismore » hexagonal. X-ray photoelectron spectroscopy and magnetic measurements identified the oxidation states of chromium in these phases.« less

Authors:
 [1];  [2];  [2];  [3];  [2];  [2]
  1. Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore (Singapore), E-mail: tbaikie@ntu.edu.sg
  2. Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore (Singapore)
  3. Laboratoire CRISMAT, UMR CNRS 6508, ISMRA-ENSICAEN, 6 Boulevard du Marechal Juin, 14050, Caen, Cedex (France)
Publication Date:
OSTI Identifier:
21015806
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2007.02.023; PII: S0022-4596(07)00097-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; APATITES; CHROMATES; CHROMIUM OXIDES; CRYSTALLOGRAPHY; ELECTRON DIFFRACTION; HEXAGONAL LATTICES; LATTICE PARAMETERS; NEUTRON DIFFRACTION; SPACE GROUPS; STRONTIUM CARBONATES; STRONTIUM FLUORIDES; TETRAGONAL LATTICES; X RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Baikie, Tom, Ahmad, Zahara, Srinivasan, Madhavi, Maignan, Antoine, Pramana, Stevin S., and White, T.J. The crystallographic and magnetic characteristics of Sr{sub 2}CrO{sub 4} (K{sub 2}NiF{sub 4}-type) and Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} (apatite-type). United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.02.023.
Baikie, Tom, Ahmad, Zahara, Srinivasan, Madhavi, Maignan, Antoine, Pramana, Stevin S., & White, T.J. The crystallographic and magnetic characteristics of Sr{sub 2}CrO{sub 4} (K{sub 2}NiF{sub 4}-type) and Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} (apatite-type). United States. doi:10.1016/j.jssc.2007.02.023.
Baikie, Tom, Ahmad, Zahara, Srinivasan, Madhavi, Maignan, Antoine, Pramana, Stevin S., and White, T.J. Tue . "The crystallographic and magnetic characteristics of Sr{sub 2}CrO{sub 4} (K{sub 2}NiF{sub 4}-type) and Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} (apatite-type)". United States. doi:10.1016/j.jssc.2007.02.023.
@article{osti_21015806,
title = {The crystallographic and magnetic characteristics of Sr{sub 2}CrO{sub 4} (K{sub 2}NiF{sub 4}-type) and Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} (apatite-type)},
author = {Baikie, Tom and Ahmad, Zahara and Srinivasan, Madhavi and Maignan, Antoine and Pramana, Stevin S. and White, T.J.},
abstractNote = {Solid-state reaction between SrCO{sub 3}, Cr{sub 2}O{sub 3} and SrF{sub 2} has produced the apatite phase Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} and Sr{sub 2}CrO{sub 4} which adopts the K{sub 2}NiF{sub 4}-type structure. The reaction outcome was very sensitive to the heating rate with rapid rise times favouring the formation of Sr{sub 2}CrO{sub 4}, which has been synthesised at ambient pressure for the first time. Powder X-ray diffraction and electron diffraction confirmed that Sr{sub 2}CrO{sub 4} adopts a body centred tetragonal cell (space group I4/mmm) with lattice parameters a=3.8357(1) A and c=12.7169(1) A, while a combination of neutron and X-ray diffraction verified Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} is hexagonal (space group P6{sub 3}/m) with lattice parameters a=9.9570(1) A and c=7.4292(1) A. X-ray photoelectron spectroscopy and magnetic measurements were used to characterise the oxidation states of chromium contained within these phases. - Graphical abstract: A solid-state reaction between SrCO{sub 3}, Cr{sub 2}O{sub 3} and SrF{sub 2} produced Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} apatite and Sr{sub 2}CrO{sub 4} which adopts the K{sub 2}NiF{sub 4}-type structure. Powder X-ray and electron diffraction confirmed that Sr{sub 2}CrO{sub 4} is body-centred tetragonal, while a combination of neutron and X-ray diffraction verified Sr{sub 10}(CrO{sub 4}){sub 6}F{sub 2} is hexagonal. X-ray photoelectron spectroscopy and magnetic measurements identified the oxidation states of chromium in these phases.},
doi = {10.1016/j.jssc.2007.02.023},
journal = {Journal of Solid State Chemistry},
number = 5,
volume = 180,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}