Structure and properties of Ba6 − xLnxNb10O30, Ln = La, Ce and Nd compounds
1997 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 32, no 4, 409-419 p.Article in journal (Refereed) Published
Ba6 − xLnxNb10O30 compounds, Ln = La, Ce and Nd, with a tetragonal tungsten bronze-type structure have been synthesized and were characterized by X-ray powder diffraction and EDS analysis. The homogeneity regions of the obtained compounds were found to be 0 ≤ x ≤ 2 for La, and 0 ≤ x ≤ 1.5 for Ce and Nd. The crystal structures of Ba5LaNb10O30 and Ba4La2Nb10O30 were refined using X-ray powder diffraction data. Refinement indicated the presence of vacancies in the positions. This observation was supported by oxidation studies of the La-substituted compounds. The temperature dependence of the normalized resistivity of the compounds showed a nonmetallic behavior. The increase in the ratio with decreasing temperature is less distinct for the phases with the higher concentration of rare-earth cation.
Place, publisher, year, edition, pages
1997. Vol. 32, no 4, 409-419 p.
oxides, chemical synthesis, X-ray diffraction, crystal structure, electric properties
Research subject Materials Chemistry
IdentifiersURN: urn:nbn:se:su:diva-43894DOI: 10.1016/S0025-5408(97)80008-6OAI: oai:DiVA.org:su-43894DiVA: diva2:371120