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An X-ray powder and electron diffraction study of reduced tantalates with the perovskite structure, Na1-xSrxTaO3, 0 < x <= 0.4
Moscow State University, Department of Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Max Planck Institute - Solid State Chemistr, Stuttgart, Germany.
2000 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 154, 427-434 p.Article in journal (Refereed) Published
Abstract [en]

Single-phase perovskite-type reduced tantalates, Na1-x SrxTaO3 with 0 < x 0.4, have been synthesized by heating mixtures of NaTaO3, Sr5Ta4O15 and Ta in sealed tantalum ampules at 1400 degreesC for 20-24 h. At Sr contents of 0.5 less than or equal to x less than or equal to 0.8 and above 1400 degreesC, polyphasic samples were obtained. X-ray powder diffraction (XRD) and transmission electron microscopy studies (selected area (SAED) and convergent beam electron diffraction (CBED)) showed an orthorhombic distortion of the x = 0.1 sample (GdFeO3 type, space group Pnma). The interpretation of the XRD, SAED, and CBED studies indicates the crystallites found in the x = 0.2 and 0.3 samples to consist of domains with tetragonal and orthorhombic symmetry having the unit Cell parameters of a = b approximate to root (2a(per)) and c approximate to 2a(per) and a approximate to b approximate to root (2a(per)) and c approximate to a(per) (a(per) cell axis in the ideal perovskite structure), respectively. The x 0.4 sample was cubic (space group Pm3m) with a = a(per). Resistivity measurements showed that all samples are semiconducting and that the conductivity increases with Sr content. Magnetic measurements of Na0.6Sr0.4TaO3 revealed a diamagnetic behavior down to 20 K. Below this temperature a slight paramagnetism arises. (C) 2000 Academic Press.

Place, publisher, year, edition, pages
2000. Vol. 154, 427-434 p.
Keyword [en]
reduced oxotantalate, perovskite, electron diffraction, crystal structure, X-ray powder diffraction
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-43878DOI: 10.1006/jssc.2000.8860OAI: oai:DiVA.org:su-43878DiVA: diva2:371576
Available from: 2010-11-21 Created: 2010-10-29 Last updated: 2011-11-02Bibliographically approved

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