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Synthesis and Structural Characterisation of MnWN2, Prepared by Ammonolysis of MnWO4
Stockholm University.
Stockholm University.
Stockholm University.
1995 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 5, no 4, 571-575 p.Article in journal (Refereed) Published
Abstract [en]

  A new ternary transition-metal nitride, the composition of which is close to MnWN2, has been synthesized by ammonolysis of X-ray amorphous MnWO4 at 800 °C. The Guinier-Hägg powder pattern could be indexed with a hexagonal cell with a = 2.921 3(3)Å and c =10.957(2)Å. Although no superstructure reflections could be observed in the X-ray powder diffraction pattern, such reflections were revealed by electron diffraction. In most of the crystallites investigated, the relationship between supercell and the hexagonal (sub)cell was found to be asuper=3ahex. A Rietveld structure determination, based on space group P63mc(no. 186), showed that the metal atoms were approximately close-packed in an ABAC…s sequence with Mn at site 2(a) and W at site 2(d). The lowest RF value (10%) was obtained for an ordered structure model with the Mn and N atoms occupying 2(a) and the W and N at sites 2(b). Measurements of the magnetic susceptibility, and of the electrical resistivity, indicated a metallic behaviour of MnWN2.

Place, publisher, year, edition, pages
1995. Vol. 5, no 4, 571-575 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-60873DOI: 10.1039/JM9950500571OAI: oai:DiVA.org:liu-60873DiVA: diva2:359612
Available from: 2010-10-28 Created: 2010-10-28 Last updated: 2017-12-12

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Käll, Per-Olov

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