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Figure 4
Results of the profile refinement for ice-VII crystallized from melt at 12.6 GPa (a) and after further pressure increase by 3 GPa without annealing (b). Peak width and peak asymmetry increase are noticeable after pressure increase. Fig. 3(c)[link] illustrates that this peak asymmetry results from strain-induced ellipticity of the Debye fringes rather than peak splitting owing to a reduction in structure symmetry. For the sample crystallized from melt we achieved wRp − bknd = 0.0852, Rp = 0.0656 and χ2 = 31.99. There were 1466 observations. The strained sample yielded wRp − bknd = 0.117, Rp = 0.0889 and χ2 = 11.31 (1464 observations). The refinement was based on weighted structure factors.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 5| August 2005| Pages 626-631
doi:10.1107/S0909049505023575
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