Structures of optical recording materials Ge2Sb 2+xTe5 studied by pulsed neutron diffraction

Shin Ichi Shamoto, Tomitsugu Taguchi, Toshiyuki Matsunaga, Noboru Yamada, Kenji Ishii, Toshiya Inami

Research output: Contribution to journalConference articlepeer-review

Abstract

Metastable cubic Ge2Sb2+xTe5 compounds, which can be prepared only as thin films, have been studied by both of neutron and x-ray powder diffraction measurements. Large displacement of germanium atoms in a crystalline cubic Ge2Sb2Te5 phase is found by PDF analysis. By adding Sb, the crystalline cubic phases coexist with two types of amorphous phases, depending on the quenching temperature. One has a first sharp diffraction peak similar to the amorphous Sb at Q ∼1.1 Å-1. Another has a new peak at Q ∼0.74 Å -1. Based on our crystal structure analyses, the composition of the new amorphous phase was estimated to be about Ge7Sb 8Te10. The composition of the crystalline solid was also found to be different from the matrix, resulting in the nucleation dominated crystal growth in this system.

Original languageEnglish
Article numberQ6.1
Pages (from-to)125-130
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume840
Publication statusPublished - 2005
EventNeutron and X-Ray Scattering as Probes of Multiscale Phenomena - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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