Preparation of a new pyrochlore-type compound Na0.32Bi 1.68Ti2O6.46(OH)0.44 by hydrothermal reaction

Qiang Dong, Hong Jiang, Nobuhiro Kumada, Yoshinori Yonesaki, Takahiro Takei, Nobukazu Kinomura

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10 Citations (Scopus)

Abstract

A new pyrochlore-type Na0.32Bi1.68Ti 2O6.46(OH)0.44 with the cubic cell of a=10.339(5) Å was prepared by hydrothermal reaction using TiO2 (anatase) and Bi2O3 in NaOH solution. This compound was obtained when the molar ratio of NaOH/TiO2 was above 2 and the reaction temperature was above 240 °C. The TG-curve of as-prepared sample showed a mass loss of 0.8 mass% which was caused by release of OH group. This compound decomposed to a pyrochlore-type compound and a layered-type Na 0.5Bi4.5Ti4O15 above 800 °C. The optical band gap of Na0.32Bi1.68Ti2O 6.46(OH)0.44 was estimated to be 2.5 eV.

Original languageEnglish
Pages (from-to)1899-1902
Number of pages4
JournalJournal of Solid State Chemistry
Volume184
Issue number7
DOIs
Publication statusPublished - 2011 Jul

Keywords

  • Hydrothermal
  • NaBiTiO (OH)
  • Pyrochlore

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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