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Synthesis and structural characterisation of MnWN2 prepared by ammonolysis of MnWO4
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
1995 (Engelska)Ingår i: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 5, 571-575 s.Artikel 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 degrees C. The Guinier-Hagg powder pattern could be indexed with a hexagonal cell with a = 2.9213(3) Angstrom and c = 10.957(2) Angstrom. 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 a(super) = root 3a(hex). A Rietveld structure determination, based on space group P6(3)me (no. 186), showed that the metal atoms were approximately close-packed in an ABAC... sequence with Mn at site 2(a) and W at site 2(d), The lowest R(F) 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, 571-575 s.
Nationell ämneskategori
Kemi
Forskningsämne
analytisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-43900DOI: 10.1039/JM9950500571OAI: oai:DiVA.org:su-43900DiVA: diva2:359732
Tillgänglig från: 2010-10-29 Skapad: 2010-10-29 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Grins, JekabsSvensson, Gunnar
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