Structure and properties of Ba6-xLnxNb10O30, Ln = La, Ce and Nd compounds

O. G. D'Yachenko, S. Ya Istomin, M. M. Fedotov, E. V. Antipov, G. Svensson, M. Nygren, W. Holm

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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 Ba/La 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 non-metallic behavior. The increase in the R/R273 ratio with decreasing temperature is less distinct for the phases with the higher concentration of rare-earth Cation.

Original languageEnglish
Pages (from-to)409-419
Number of pages11
JournalMaterials Research Bulletin
Volume32
Issue number4
DOIs
Publication statusPublished - Apr 1997
Externally publishedYes

Keywords

  • A. oxides
  • B. chemical synthesis
  • C. X-ray diffraction
  • D. crystal structure
  • Electric properties

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