Van Tendeloo G, Amelinckx S
Universiteit Antwerpen, R.U.C.A., Antwerp, Belgium.
J Electron Microsc Tech. 1988 Mar;8(3):285-95. doi: 10.1002/jemt.1060080307.
The superconducting material Y1Ba2Cu3O7-delta has been investigated by electron microscopy. Special attention has been paid to the defects occurring in the material. Twinning on (110) or (110) planes is intrinsically related to the orthorhombicity, and when cooled slowly the twin bands are pseudoperiodic with an average width of approximately 50 nm. The orthorhombic-tetragonal transition is reversible and diffusion controlled. Under particular conditions and in slightly reduced material a 2a0 x b0 superstructure resulting from vacancy ordering is formed. When kept in air under powder form the material seems to be unstable. Planar defects along (001) accompany the degeneration of the material.
通过电子显微镜对超导材料Y1Ba2Cu3O7-δ进行了研究。特别关注了该材料中出现的缺陷。在(110)或(110)平面上的孪晶与正交性本质相关，缓慢冷却时，孪晶带呈准周期性，平均宽度约为50纳米。正交-四方转变是可逆的且受扩散控制。在特定条件下，在略微还原的材料中会形成由空位有序化导致的2a0×b0超结构。当以粉末形式保存在空气中时，该材料似乎不稳定。沿(001)的平面缺陷伴随着材料的退化。
