Abstract
As the use of the nuclear power is increased, the safe disposal of highly radioactive wastes has been required. It needs to immobilize the wastes in stable and dense solid(1)(2). The most popular procedure being incorporate the wastes into borosilicate glass is thermodynamically unstable relative to crystalline phases. Immobilization of the wastes in crystalline phases has been researched on supercalcine(3)(4) and synthetic rock(2)(4). However, the high temperature and the long reaction time are necessary to immobilize the wastes by these methods, because of the slow reaction in viscous melt or solid state of silica, titania, zirconia and other oxides.Keywordshydrothermal hot-pressinghydrothermal synthetic rocklithificationimmobilizationradioactive wastessilica powdermechanical strength
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