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

パルス中性子回折で調べた光記録材料Ge$$_2$$Sb$$_{2+x}$$Te$$_5$$の構造

社本 真一  ; 田口 富嗣; 松永 利之*; 山田 昇*; 石井 賢司; 稲見 俊哉

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

光相変化記録材料として使われている準安定立方晶のGe$$_2$$Sb$$_{2+x}$$Te$$_5$$試料を、パルス中性子とX線の両方の粉末回折測定により調べた。その結果、結晶相はSb添加量に依存して、異なる2種類のアモルファス相と共存することを発見した。一つは、アモルファスSbと似たピーク(FSDP)を持ち、もう一方は、低いQ領域に新しいFSDPを持つ。このピークシフトの原因をそれらの組成の観点から議論する。

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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