Crystal Structure Stability of Simulated Sr1-1.5xYxTiO3（x=0-0.12） Waste Forms
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2017年第1期
论文作者：牟婉君 YU Qianhong LI Xingliang WEI Hongyuan 蹇源
文章页码：89 - 93
摘 要：A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction process.The effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were investigated.Pure and single-phase perovskite-type Sr1-1.5xYxTiO3（x<0.08） solid solutions were obtained at 1 400 ℃ for 6 h.The perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the 90Sr.The X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid solution.Stretching and bending vibrations were assigned in the infrared region.The SrTiO3 grain size increased with Y content.The leaching behavior of Y3+ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.
牟婉君，YU Qianhong，LI Xingliang，WEI Hongyuan，蹇源
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics
摘 要：A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction process.The effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were investigated.Pure and single-phase perovskite-type Sr1-1.5xYxTiO3（x<0.08） solid solutions were obtained at 1 400 ℃ for 6 h.The perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the 90Sr.The X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid solution.Stretching and bending vibrations were assigned in the infrared region.The SrTiO3 grain size increased with Y content.The leaching behavior of Y3+ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.
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