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Synthesis and Structural Characterisation of MnWN2, Prepared by Ammonolysis of MnWO4
Stockholm University.
Stockholm University.
Stockholm University.
1995 (Engelska)Ingår i: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 5, nr 4, s. 571-575Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
1995. Vol. 5, nr 4, s. 571-575
Nationell ämneskategori
Naturvetenskap
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URN: urn:nbn:se:liu:diva-60873DOI: 10.1039/JM9950500571OAI: oai:DiVA.org:liu-60873DiVA, id: diva2:359612
Tillgänglig från: 2010-10-28 Skapad: 2010-10-28 Senast uppdaterad: 2017-12-12

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