The results of a transmission electron microscope study of the hydrothermal alteration products formed by perovskite and two titantate‐based “synroc” formulations are reported. It was found that perovskite, the host phase for strontium‐90, dissolved at combined temperatures and pressures greater than 110°C and 180 kPa. Dissolution of perovskite was accompanied by an epitaxial crystallization of the titanium dioxide polymorphs, brookite and anatase. Hollandite, which incorporates cesium‐137, dissolved more slowly than perovskite, with only minor TiO 2 crystallization. Intergrowths of zirconolite and zirkelite, the principal actinide‐containing phases, were highly resistant to hydrothermal treatments, maintaining their integrity under all experimental conditions.
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Kastrissios et al. (1987) studied this question.
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