Annealing effects of helium implanted single crystals and polycrystalline magnesium aluminate spinel
Progress in Nuclear Energy(2001)
摘要
The effects of transmutation produced α-particles and the thermal behaviour of the incorporated helium is simulated by 900 keV 3He ion implantations at 2 μm depth in (100) surface oriented single crystals and in polycrystalline samples. Thermal Helium Desorption Spectrometry (THDS) and Neutron Depth Profiling (NDP) have been applied to study the release rate of helium and changes in the depth profile, respectively, during isothermal annealing. Release of the helium took place in at least two stages in a wide temperature interval ranging from 600 to 1600 K. For polycrystalline spinel an additional high temperature release stage at T > 1300 K was ascribed to trapping in pores. For the high dose implanted single crystals mainly helium release in bursts was observed due to thermally induced flaking.
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关键词
implantation,Thermal Helium Desorption Spectrometry,polycrystalline,single crystal
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