Title of article
Structure and properties of Ba6 − xLnxNb10O30, Ln = La, Ce and Nd compounds
Author/Authors
Dyachenko، نويسنده , , O.G. and Istomin، نويسنده , , S.Ya. and Fedotov، نويسنده , , M.M. and Antipov، نويسنده , , E.V. and Svensson، نويسنده , , G. and Nygren، نويسنده , , M. and Holm، نويسنده , , W.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 1997
Pages
11
From page
409
To page
419
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 BaLa 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 RR273 ratio with decreasing temperature is less distinct for the phases with the higher concentration of rare-earth cation.
Keywords
oxides , chemical synthesis , X-ray diffraction , crystal structure , electric properties
Journal title
Materials Research Bulletin
Serial Year
1997
Journal title
Materials Research Bulletin
Record number
2093481
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