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Synthesis and characterization of reduced niobates CaLnNb2O7, Ln = Y, Nd with a pyrochlore structure
Moscow State University, Department of Chemistry.
Moscow State University, Department of Chemistry.
Moscow State University, Department of Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
1997 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 32, no 4, 421-430 p.Article in journal (Refereed) Published
Abstract [en]

The first known reduced niobates with a pyrochlore structure, CaLnNb(2)O(7) Ln = Y, Nd, have been synthesized from Ca2Nb2O7, Ln(2)O(3), and NbO2 in sealed Nb ampoules heated at 1400 degrees C for 6 h. Our studies show that these compounds have a small homogeneity region according to the formula Ca(2-x)Ln(x)Nb(2)O(7), Ln = Nd with x = 0.9, 1.0; and Ln = Y with x = 1.0, 1.1. The prepared compounds were characterized by EDX (energy dispersive X-ray) analysis, X-ray and electron diffraction, and thermogravimetric analysis. The crystal structures of CaNdNb2O7 and CaYNb2O7 were refined using X-ray and neutron powder diffraction data. CaNdNb2O7 and CaYNb2O7 have undistorted pyrochlore structures: space group Fd3m, a = 10.416(1) Angstrom and 10.3159(8) Angstrom, respectively. Resistivity measurements show that CaNdNb2O7 exhibits semiconducting behavior. Copyright (C) 1997 Elsevier Science Ltd.

Place, publisher, year, edition, pages
1997. Vol. 32, no 4, 421-430 p.
Keyword [en]
oxides, chemical synthesis, X-ray diffraction, crystal structure, electric properties
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-43895DOI: 10.1016/S0025-5408(96)00003-7OAI: oai:DiVA.org:su-43895DiVA: diva2:371121
Available from: 2010-11-18 Created: 2010-10-29 Last updated: 2017-12-12Bibliographically approved

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