Interfacial defects of hard magnetic Pr₂Fe₁₄B phase from amorphous to nanostructures^①

来源期刊：中国有色金属学报(英文版)2004年第4期

论文作者：吴玉程

文章页码：654 - 659

Key words：Pr₂Fe₁₄B; amorphous; nanostructure; interfacial structure

Abstract: The interfacial defects of hard magnetic Pr₂Fe₂B phase from amorphous to nanostructures have been investigated by positron lifetime spectroscopy. The nanostructure was produced by melt-spinning and nanocrystallization route. The two main components can be ascribed to vacancy-like defects in the intergranular layers or the interfaces, and microvoids or large free volumes with size compared to several missing atoms at the interactions of the atomic aggregates or the crystallites. The remarkable changes in the positron lifetimes from the amorphous structure to the nanocrystructure with varied sizes can be interpreted, indicating that the structural transformation and the grain growth induce the defect changes occurring at the interfaces with different shapes and sizes.