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Figure 3
Scattering intensity extrapolated to q = 0 using equation (5)[link], plotted as a function of temperature of measurement for different silica samples: sample A ([OH] = a few p.p.b.) annealed at 1373 K (black diamonds) and annealed at 1773 K (black circles), sample B ([OH] = 2 p.p.m., open circles) and sample C ([OH] = 900 p.p.m., open triangles). The dotted-dashed lines indicate how a `fictive temperature' is determined for samples whose thermal histories are not well defined. The dotted lines show from which intensities [ \chi_{{\rm T}}^0(T_{{\rm f}})-M_{\infty}^{-1}(T_{{\rm f}})] and [M_{\infty}^{-1}(T_{{\rm f}})] are determined.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 40| Part s1| January 2007| Pages s512-s516
doi:10.1107/S0021889807000507
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