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摘要: 用电子显微术和电子衍射方法研究了在普通真空中蒸发淀积的非晶态Tb31Fe69和Tb27Fe73薄膜的显微结构,短程有序情况以及它们随温度的变化,并进而观察了晶化过程,实验结果表明,两个成份相近的薄膜,由于氧污染的程度和蒸发时衬底温度不同,在升温的各阶段,呈不同的显微结构和原子近邻配置,具有不同的相分离状态,但相分离机构可能均属不稳态分解(Spinodal decomposition),相分离后的每相随温度升高各自晶化,
Abstract: Using electron microscopy and electron diffration methods, we have investigated the microstructures, shortrange order and their changes with increasing temperature in amorphous Tb31Fe69 and Tb27Fe73 films prepared by vapour deposition in a vacuum of 10-5 torr. The process of crystallization have also been observed and analysed. The microstructures of samples with different oxygen contamination and different annealing temperatures were found to be different. However, the phase separation of both samples seemed to occure by a mechanism similar to spinodal decomposition, by which an initial amorphous phase first decomposed into two or more compsitionally discrete amorphous phase, each of which then crystallized independently with rising temperature. Thus, the whole process of crystallization consisted of several stages. Finally a poly-crystalline mixture would be formed.