| Abstract
| - High-pressure synchrotron X-ray powder diffraction measurements of a sample of purely siliceouszeolite Y (faujasite) were carried out up to 8.0 GPa at room temperature using a diamond anvil cell.Measurements using silicone oil as the pressure-transmitting medium show compression of the zeolitefollowed by a loss of long-range ordering at 2.2 GPa. The experimentally determined bulk modulus, 38(2)GPa, is, within experimental error, identical to that of quartz. When using a methanol:ethanol:water mixture(16:3:1) as the pressure-transmitting medium, two distinct compressibility regions are observed with adramatic change in the compression mechanism at 4 GPa. Rietveld refinement analysis of the powderpatterns provides a detailed description of the underlying chemistry, with sequential pore filling the mainresponse up to 4 GPa and framework distortions at higher pressures.
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