Zn/Al-centered tetrahedral framework oxide Ba4Zn2Al2O9

Rayko Simura, Kyosuke Sawamura, Hisanori Yamane

Research output: Contribution to journalArticlepeer-review

Abstract

Single crystals of Ba4Zn2Al2O9 were obtained by heating a mixture of BaCO3, ZnO, and Al2O3 at 1413 ​K in a dry air atmosphere. X-ray crystal structure analysis revealed that the compound crystalizes in a monoclinic cell (a ​= ​6.9444(2) Å, b ​= ​5.91650(10) Å, c ​= ​13.5842(3) Å, β ​= ​103.955(1)°) with the space group P21/n. The crystal structure can be characterized as a substitution of Zn/AlO4 tetrahedra for B-cation-centered O octahedra of a perovskite-type structure (ABO3). The vacant spaces surrounded by planes of the tetrahedra with eight- and ten-fold coordinations of O atoms are occupied by Ba atoms. The melting temperature (1444 ​K), electrical conductivity (1.5 ​× ​10–6 ​S ​cm–1 at 1073 ​K), relative permittivity (24 ​at 298 ​K and 1 ​MHz), and linear thermal expansion coefficient (9.72 ​× ​10–6 ​K–1 ​at 298–873 ​K) of a polycrystalline bulk sample were measured.

Original languageEnglish
Article number122830
JournalJournal of Solid State Chemistry
Volume307
DOIs
Publication statusPublished - 2022 Mar

Keywords

  • Barium zinc aluminate
  • Dielectric property
  • Electrical conductivity
  • Thermal expansion
  • Zn/AlO tetrahedral framework

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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