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Phases in the Mn-Nb-N-O system, formed by ammonolysis of mixtures of Mn acetate tetrahydrate and a Nb xerogel
Institute of Solid State Chemistry, Russian Academy of Science, Ekaterinburg, Russia.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
1998 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 33, no 7, 1035-1044 p.Article in journal (Refereed) Published
Abstract [en]

Phase formation in the system Mn-Nb-O-N has been studied by ammonolysis of mixtures of Mn acetate tetrahydrate and an Nb xerogel at 600-900 degrees C. Observed phases were characterized by powder X-ray diffraction, scanning and transmission electron microscopy, combustion analysis, and thermogravimetric analysis. An Nb4N5-related phase, with a metal content of less than or equal to 15 at% Mn, was obtained pure at 650-700 degrees C. A new hexagonal phase MnNb2(N,O)(3) was obtained at 750-900 degrees C, Its structure is related to, but not isotypic with, that of Nb5N6. In addition, the preparations contained cubic NaCl-type (Mn, Nb)(N,O) phases. The Mn-free Nb4-y(N,O)(5) and Nb5-y(N,O)(6) (y signifying metal vacancies), with Nb4N5- and Nb5N6-type structures, respectively, were synthesized, to make possible structural comparisons with the Mn-containing phases. A black trigonal phase Mn-3.66(6)Nb-2.34(6)(O,N)(9) with a structure closely related to that of Mn4Nb2O9 was obtained at 700 degrees C. (C) 1998 Elsevier Science Ltd.

Place, publisher, year, edition, pages
1998. Vol. 33, no 7, 1035-1044 p.
Keyword [en]
nitrides, inorganic compounds, chemical synthesis
National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-43889DOI: 10.1016/S0025-5408(98)00070-1OAI: oai:DiVA.org:su-43889DiVA: diva2:371526
Available from: 2010-11-21 Created: 2010-10-29 Last updated: 2011-11-02Bibliographically approved

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