The H-induced defects in monocrystals which had been grown by using the float-zone method, in a H atmosphere, were studied by using high-energy synchrotron radiation cross-section topography. The static Debye-Waller factor, which was produced by H precipitates that formed during isochronal annealing, was calculated on the basis of statistical-dynamic diffraction theory. Within the proposed H2-molecule cluster model for a precipitate, the size and density of H precipitates were determined by using the static Debye-Waller factor method and the results of infra-red absorption spectrometry. The characteristics of the early stages of H precipitation indicated that H in p-type material was mobile and less stable, when compared with that in n-type material.

S.F.Cui, S.Iida, G.M.Luo, Z.H.Mai, H.Kawata: Philosophical Magazine A, 1997, 75[1], 137-51