Synthesis, superconducting properties and structural (including electron diffraction) studies of Na chi NbO2 and Li chi NbO2
1996 (English)In: European Journal of Solid State and Inorganic Chemistry, ISSN 0992-4361, Vol. 33, 53-65 p.Article in journal (Refereed) Published
Monophasic NaxNbO2 (x = 0.5 - 0.6), T-c approximate to 4.1 K was prepared by solid state reaction between Na3NbO4 and Nb. X-ray powder diffraction data from a monophasic sample were used for a refinement of the structure of Na0.5NbO2 (R(p) = 7.4 % and R(I) = 5.3 %), using the Rietveld method. At low x-values a closely related second phase can occur. Rietveld refinement using X-ray powder diffraction data showed this phase to be isostructural with NaNbO2 but with the chemical formula Na0.1NbO2. Transmission electron microscopy studies of NaxNbO2 and LixNbO2 revealed the presence of superstructures in some crystallites. The electron diffraction patterns resemble to some extent those reported for transformations among tantalum chalcogenides.
Place, publisher, year, edition, pages
1996. Vol. 33, 53-65 p.
electric properties, superconductors, semiconductors;structure (solids and liquids), niobium, Nb, sodium, Na, lithium, Li
Research subject Materials Chemistry
IdentifiersURN: urn:nbn:se:su:diva-43897DOI: 10.1002/chin.199624017OAI: oai:DiVA.org:su-43897DiVA: diva2:371117