Structures of stable and metastable Ge2Bi2Te 5, an intermetallic compound in a GeTe-Bi2Te3 pseudobinary system

Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Kouichi Kifune, Yoshiki Kubota, Masaki Takata

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13 Citations (Scopus)


Ge2Bi2Te5 in the GeTe-Bi2Te3 pseudobinary system has two single-crystalline phases: a metastable phase with an NaCl-type structure and a stable phase with a nine-layer trigonal structure. In the metastable phase, the structure consists, in the hexagonal notation, of infinitely alternating stacks of Te and Ge/Bi layers at equal intervals along the c axis. On the other hand, in the stable phase those two layers are stacked alternately nine times to form an NaCl block. The blocks are then piled to construct a nine-layered trigonal structure with cubic close-packed stacking. Both ends of each block are covered with Te layers, contrary to the infinite alternation of Ge/Bi and Te layers in the structure of the metastable phase. The Ge/Bi layers in the metastable phase contain as much as 20 at. % vacancies; on the other hand, those in the stable phase are filled with atoms. These two crystalline phases in Ge2Bi2Te5 have identical atomic configurations to the two corresponding phases found in Ge2Sb2Te5.

Original languageEnglish
Pages (from-to)346-352
Number of pages7
JournalActa Crystallographica Section B: Structural Science
Issue number3
Publication statusPublished - 2007 May 16
Externally publishedYes


  • Pseudobinary system
  • Stable and metastable phases

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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