Page 88 - Materials Chemistry, Second Edition
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2.3. The Crystalline State
Figure 2.45. Diffraction patterns collected from the tridymite phase of SiO 2 compressed to different
pressures at room temperature. The polycrystalline sample at ambient pressure (a–c) gradually transforms
to a single crystal at a pressure of 16 GPa (d). Further compression results in disordering of the crystal
lattice (e,f), eventually resulting in diffuse scattering rings, characteristic of an amorphous morphology at
pressures of 46 GPa and higher (g,h). Reproduced with permission from J. Synchrotron Rad. 2005, 12,
560. Copyright 2005, International Union of Crystallography.
