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Report No.

Structures of optical recording materials Ge$$_2$$Sb$$_{2+x}$$Te$$_5$$ studied by pulsed neutron diffraction

Shamoto, Shinichi  ; Taguchi, Tomitsugu; Matsunaga, Toshiyuki*; Yamada, Noboru*; Ishii, Kenji; Inami, Toshiya

Metastable cubic Ge$$_2$$Sb$$_{2+x}$$Te$$_5$$ samples, which are widely used as optical recording materials, have been studied by both of pulsed neutron and X-ray powder diffraction measurements. The crystalline cubic phases are found to coexist with two types of amorphous phases, depending on their antimony contents. One has the same first sharp diffraction peak (FSDP) as the amorphous antimony at the higher Q position. Another has a new FSDP at a lower Q position. The origin of the peak shift is discussed in terms of their constituents.



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