Synthesis, crystal structure and electrical properties of Ba2Nb5-xVxO9 (x<1.9)

Kouta Iwasaki, Hisanori Yamane, Shunichi Kubota, Junichi Takahashi, Masahiko Shimada, Hirotsugu Takizawa, Kyota Uheda, Tadashi Endo

Research output: Contribution to journalArticlepeer-review

Abstract

The Ba2Nb5-xVxO9 solid solution was synthesized by replacement of Nb by V in Ba2Nb5O9. The polycrystalline samples were prepared by solid state reaction at 1773 K under flowing Ar. Ba2Nb5O9 has three Nb sites; the Nb(1) and Nb(2) sites form the Nb6 octahedron, and the Nb(3) site is in the center of the NbO6 octahedron. The Rietveld analysis indicated that V atoms occupied both Nb(1) and Nb(2) sites. The a and c axis lengths decreased with increasing V content (a=4.171-4.106 Å, c=12.224-12.136 Å), the substitution range was estimated to be 0≤x<1.9. The electrical resistivity of Ba2Nb5-xVxO9 showed metallic behavior at 100-350 K, which increased with increasing V content. Substitution of V atoms changed the main conductive carrier; the Seebeck coefficient of Ba2Nb5-xVxO9 increased with increasing V content and it exhibited positive value at x=1.5 in 100-300 K while the Seebeck coefficient of Ba2Nb5O9 (x=0) showed a negative value.

Original languageEnglish
Pages (from-to)268-274
Number of pages7
JournalJournal of Alloys and Compounds
Volume339
Issue number1-2
DOIs
Publication statusPublished - 2002 Jun 13

Keywords

  • Crystal structure symmetry
  • Electronic transport
  • Magnetization
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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