González-Calbet J M, Sayagués M J, Varela A, Alonso J M, Caneiro A, Vallet-Regí M
Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense, Madrid, Spain.
Microsc Res Tech. 1995 Feb 15;30(3):193-207. doi: 10.1002/jemt.1070300302.
After reviewing microstructural studies on superconducting materials showing T, T', and T* structural types, results are presented on the microstructure of some n-type superconductors and related materials prepared with accurate control of the oxygen stoichiometry. Electron microscopy is used to describe the ordering of interstitial oxygen defects in T-type La2NiO4 + delta leading to the formation of the n = 2 term of a homologous series with the general formula La8nNi4nO16n + 1. Structural transitions and superstructure formation in the Pr2-x-yCexSryCuO4-delta system are reported, where T, T', and T* phases are isolated as a function of both Ce and Sr content.
在回顾了关于呈现T、T'和T结构类型的超导材料的微观结构研究之后，给出了一些通过精确控制氧化学计量比制备的n型超导体及相关材料的微观结构研究结果。利用电子显微镜描述了T型La2NiO4 + δ中间隙氧缺陷的有序化，这导致形成了通式为La8nNi4nO16n + 1的同系物系列中n = 2项。报道了Pr2-x-yCexSryCuO4-δ体系中的结构转变和超结构形成，其中T、T'和T相是Ce和Sr含量的函数而被分离出来。
