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Synthesis, structural characterization and magnetic properies of Gd14W4O33-xNy (0≤x≤17, 0≤y≤9), a new fluorite-related oxynitride
Dept. Physical, Inorganic and Structural Chemistry, Stockholm University.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Dept. Physical, Inorganic and Structural Chemistry, Stockholm University.
1996 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 240, no 1-2, 60-69 p.Article in journal (Refereed) Published
Abstract [en]

A series of crystalline Cd-W oxides. with Gd:W ratios spanning the values 0.1-3.5. has heen prepared and treated with a flow of NH3(g) in the temperature range 700-1100 oC. Besides the previously reported formation of GdWO3N and Gd2WO3N2. the following new results were obtained: (I) cubic Gd0.1WO3 upon ammonolysis forms an (oxy)nitride Gd0.1x W(O. N) with an f.c.c lattice; (ii) the previously described Gd2WO3N2 exhibits a solid solubility range Gd3-xW1+x(O.N)y with, approximately, 0≤x≤1; (iii) ammonolysis of Gd14W4O33 yields an oxynitride, the composition of which varies with the synthesis temperature according to Gd14W4O33-xNy (0≤x≤17±2, 0≤y≤9±2). All strong diffraction lines, including those of the pure oxide (x =y= 0), can be indexed with a body-centred monoclinic unit cell derived from that of fluorite. For Gd14W4O33 the cell parameters are a = 5.3592(11), b = 3.7295(7), c = 3.8636(8), β = 92.170(2)o and V = 77.17 Å3. However, strong superstructure rereflections in the electron diffraction patterns indicate that the true unit cell is considerably larger. A partial structur determination of Gd14W4O33-xNy has been carried out by the Rierveld method. Magnetic susceptibility measurements in the temperature interval 15-300 K show a Curie-Weiss behaviour for Gd14W4O33-xNy with μeff = 8.08±0.06 Bohr magnetons per Gd3+ and θ = −12.4±1.1 K for all compositions.

Place, publisher, year, edition, pages
1996. Vol. 240, no 1-2, 60-69 p.
Keyword [en]
Gd-W oxynitrides; Ammonolysis; Rietveld refinement; Electron diffraction; Magnetic susceptibility
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-54188DOI: 10.1016/0925-8388(96)02325-0OAI: oai:DiVA.org:liu-54188DiVA: diva2:300853
Available from: 2010-03-01 Created: 2010-03-01 Last updated: 2010-03-17

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Käll, Per-Olov

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