Single structure widely distributed in a GeTe-Sb2Te3 pseudobinary system: A rock salt structure is retained by intrinsically containing an enormous number of vacancies within its crystal

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

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

GeTe(1-x)-Sb2Te3(x) sputtered amorphous film was crystallized into a simple NaCl-type structure through instantaneous laser irradiation over a wide composition range from x = 0 to at least 2/3. When the ratio of Sb2Te3 increases, a vacancy is generated at every Na site for two Sb atoms. The fraction of vacancies, v(x), changes according to x/(1 + 2x), and the cubic root unit cell volume varies with a strong correlation to v(x). Through these created vacancies, valence electrons provided by adjacent Ge/Sb and Te atoms remain constant regardless of the composition, ensuring that these electrons occupy predominantly the bonding molecular orbitals. This results in crystal chemical stability, with the closed shell p-p bondings in the valence electrons arranging the crystal's atomic configuration into an NaCl-type structure.

Original languageEnglish
Pages (from-to)2235-2241
Number of pages7
JournalInorganic chemistry
Volume45
Issue number5
DOIs
Publication statusPublished - 2006 Mar 6
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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