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Synthesis and structural characterisation of MnWN2 prepared by ammonolysis of MnWO4
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-0598-4769
1995 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 5, p. 571-575Article 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 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

Place, publisher, year, edition, pages
1995. Vol. 5, p. 571-575
National Category
Chemical Sciences
Research subject
Analytical Chemistry
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URN: urn:nbn:se:su:diva-43900DOI: 10.1039/JM9950500571OAI: oai:DiVA.org:su-43900DiVA, id: diva2:359732
Available from: 2010-10-29 Created: 2010-10-29 Last updated: 2022-02-24Bibliographically approved

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Grins, JekabsSvensson, Gunnar

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