Table 1 Diffraction spacings and assignments for diffraction patterns

From: Nucleation of quartz under ambient conditions

Electron diffraction from 3.0 wt.% aqueous SMS microemulsion (Fig. 1c)

Electron diffraction from 7.5 wt.% aqueous SMS microemulsion (Fig. 1f)

Measured d-spacing (nm)

Assignment

Measured d-spacing (nm)

Assignment

0.172a

α-Quartz {\(\bar 2\)02} at 0.167 nm

0.172a

α-Quartz {\(\bar 2\)02} at 0.167 nm

  

0.192

Silicon {220} at 0.192 nm

0.197

α-Quartz {02\(\bar 1\)} at 0.198 nm

0.200

α-Quartz {02\(\bar 1\)} at 0.198 nm

0.311

Silicon {111} at 0.314 nm

0.311

Silicon {111} at 0.314 nm

  

0.339a

α-Quartz {\(\bar 1\)01} at 0.334 nm

  1. aThese spacings are slightly larger than the bulk α-quartz spacings. This may just reflect the uncertainty in the measurements or it may be indicative of a slightly perturbed quartz structure for the nanocrystals. The latter would be in agreement with our hydrothermal studies, where XRD analysis showed the nanoquartz obtained after 1–5 days also contained perturbed structures, with {101} spacings of 0.340 nm