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Nuclear reaction analysis of helium diffusion in britholite

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms
0168-583X
Publisher
Elsevier
Publication Date
Volume
195
Identifiers
DOI: 10.1016/s0168-583x(02)01137-0
Keywords
  • Britholite
  • Helium Depth Profiling
  • Thermal Diffusion

Abstract

Abstract We have derived the helium bulk diffusion constants in britholite (Ca 9Nd(PO 4) 5(SiO 4)F 2) from non-destructive 3He depth profiling using the resonant 3He(d, p) 4He nuclear reaction. Results have been obtained on a polycrystalline sintered ceramics implanted with 3 MeV 3He + ions at a depth around 9 μm then annealed in air at temperatures between 200 and 400 °C. The activation energy for helium diffusion is around 1.1 eV. These data are in good agreement with literature data based on ERDA depth profiling of 27 keV 4He + ions implanted in natural (Durango) or synthetic fluorapatite single crystals.

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