0.56GeV C6+离子在YIG上的辐照效应

用穆斯堡尔谱学、正电子湮没技术和高分辨电子显微镜等方法研究了高能碳离子在石榴石铁氧体材料上的辐照效应,辐照效应引起材料微结构变化源于缺陷和缺陷团,导致缺陷周围磁结构变化,内场趋向各向同性,辐照并且使得晶胞参数变大;引起材料磁性能变化源于由于O~2—空位形成而使超交换场降低,从而减小超精细场。 The vacancies and vacancy clusters induced by the irradiation lead to the change of themagnetic structure around the defects. The reduction of the hyperfine magnetic field is caused by thelower superexchange field due to the formation of the O~(2-) vacancies. The change of direction of thehyperfine field has been also observed in Mossbauer spectra. On the other hand, the X-raydiffraction showed that the defects give rise to an increase of the lattice constant of the samples.     

中能重离子在铁氧体材料中的辐照效应

本文系统地评述了中能重离子在铁氧体材料小辐照效应的国际国内研究概况．并指出了利用兰州重离子研究装置（ＨＩＲＦＬ）可进一步开展的工作.This paper gives a systemic review on the recent progress in the study of irradiation effects in ferrite induced by energetic heavy ions, and also gives a suggestion thatsome experiments in this field can be carried out further by Heavy Ion Reseach Facility ofLanzhou(HIRFL ).     

重离子在束穆斯堡尔谱学

八十年代后期在西德UNILAC 和VICKSI 重离子加速器上相继建立了在束穆斯堡尔装置,进行库仑激发反冲注入穆斯堡尔谱学研究。本文评述这一新领域和在应用方面所取得的引人注目的成果。