CAJ | 학술논문

由于Ge原子在相变过程中的重要作用，使其在GeSbTe合金亚稳相中的局域结构长期以来为人们所关注。本文利用电子衍射技术和基于电子衍射的径向分布函数，以及高分辨电子显微学，对GeSb2 Te4亚稳相的原子结构进行了深入研究。径向分布函数G（ r）显示，在GeSb2 Te4亚稳相中几乎所有的Ge原子都为四面体构型；实验及模拟高分辨像结果表明，由于几乎所有的Ge占据Te四面体的中心，GeSb2 Te4亚稳相形成了一种类尖晶石结构而非人们广泛接受的岩盐矿结构。
유우Ge원자재상변과정중적중요작용，사기재GeSbTe합금아은상중적국역결구장기이래위인문소관주。본문이용전자연사기술화기우전자연사적경향분포함수，이급고분변전자현미학，대GeSb2 Te4아은상적원자결구진행료심입연구。경향분포함수G（ r）현시，재GeSb2 Te4아은상중궤호소유적Ge원자도위사면체구형；실험급모의고분변상결과표명，유우궤호소유적Ge점거Te사면체적중심，GeSb2 Te4아은상형성료일충류첨정석결구이비인문엄범접수적암염광결구。
The local structures of Ge in metastable GeSbTe crystalline phases have long been concerned due to their key role in the phase transition. In this paper, the atomic structure of the GeSb2 Te4 metastable phase was investigated by using the radial distribution function based on the electron diffraction and high resolution transmission electron microscopy. The radial distribution function G( r) reveals that almost all of Ge are located in the tetrahedral centers of Te fcc lattice in the well?developed GeSb2 Te4 metastable phase. The high resolution transmission electron microscopy image and the corresponding simulations further indicate that a pseudo?spinel structure with tetrahedral Ge has formed, but not the generally accepted rocksalt structure.