Determination of space group of BaPb0.75Bi0.25O3 by convergent-beam electron diffraction

Takuya Hashimoto, Kenji Tsuda, Junichiro Shiono, Junichiro Mizusaki, Michiyoshi Tanaka

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2 Citations (Scopus)

Abstract

The space group of BaPb0.75Bi0.25O3 with distorted perovskite structure was investigated by convergent-beam electron diffraction (CBED) and selected area electron diffraction (SAD). The symmetry of observed CBED patterns was either 1 or m and no CBED pattern with fourfold nor sixfold symmetry was observed, indicating that the crystal system of BaPb0.75Bi0.25O3 is either orthorhombic or monoclinic. The ±G dark field disk of CBED patterns indicated that no inversion center existed in BaPb0.75Bi0.25O3 and that the point group of BaPb0.75Bi0.25O3 was either m or mm2. It was concluded that the point group of BaPb0.75Bi0.25O3 was not mm2 but m because CBED patterns with symmetry of not only m but also 1 were taken at [111] incidence with pseudo-cubic perovskite notation. From CBED patterns taken at [111] azimuth, unique axis of monoclinic BaPb0.75Bi0.25O3 with point group of m was also determined. The lattice type of BaPb0.75Bi0.25O3 was determined to be a body centered one from the extinction rule of SAD pattern. No Gjønnes-Moodie lines, which indicated existence of glide plane or screw axis, were observed in all of the CBED patterns, leading to the conclusion that the space group of BaPb0.75Bi0.25O3 is Im (No. 8).

Original languageEnglish
Pages (from-to)422-430
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume382
Issue number4
DOIs
Publication statusPublished - 2002 Nov 15

Keywords

  • BaPbBiO
  • Convergent-beam electron diffraction
  • Crystal structure
  • Selected-area electron diffraction
  • Space group

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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