Hot Isostatic Pressing of Cs-exchanged IONSIV IE-911 samples is shown to produce a mixture of ceramic phases, the nature and mass fractions of these have been determined by Rietveld analysis of powder X-ray diffraction data. The main Cs phase that forms is Cs_2TiNb_6O_(18), after this reaches approximately 30% of the total crystalline content the remaining Cs is partitioned into Cs_2ZrSi_6O_(15). Durability tests using the PCT-B method for 7 days at 90 °C with deionised water lead to Cs leach rates of 0.032 and 0.038 g·m~(-2)·day~(-1) for samples exchanged to 6 and 12 wt% Cs, respectively, indicating a durable wasteform is produced.
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