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Hydrothermal Dissolution of Perovskite: Implications for Synroc Formulation
Author(s) -
Kastrissios Theodora,
Stephenson Mark,
Turner Peter S.,
White Timothy J.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb05689.x
Subject(s) - brookite , zirconolite , hollandite , hydrothermal circulation , perovskite (structure) , dissolution , crystallization , anatase , materials science , chemical engineering , mineralogy , strontium , phase (matter) , nuclear chemistry , chemistry , pyrochlore , organic chemistry , photocatalysis , engineering , catalysis
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.