Using the aforementioned conditions, two additional samples with weight percentages of 10% and 30% of ZIF-8 were synthesised. PXRD from the physical mixtures showed that the intensities of the Bragg peaks belonging to ZIF-8 are, as expected, amplified with the increasing amount of ZIF in the material, whilst the diffuse scattering contribution is higher with a larger content of the inorganic glass (Fig. ). PXRD patterns after pelletisation showed a reduction of intensity of the Bragg peaks, indicating a partial loss of crystallinity in the ZIF-8. However, the presence of the inorganic glass in the physical mixture reduces this effect, compared to the pelletisation of pristine ZIF-8 (Fig. ). This suggests the glass matrix may protect the ZIF-8 from amorphisation under pressure. Surprisingly, comparison between pelletised samples before and after thermal treatment at 310 °C highlighted higher Bragg intensities for the composite after the thermal treatment than before, indicating ZIF-8 structure recovers crystallinity during heating, similarly to an annealing process (Fig. , Table ). Pawley refinements of the three compositions of the MOF-CIGC were performed, demonstrating a small contraction of the network after the pelletisation and thermal treatment in each case (Fig. and Table ).