Crystal structure stability of simulated Sr_1–1.5x Y _x TiO₃ (x = 0–0.12) waste forms

详细信息    查看全文

• 作者：Wanjun Mu 牟婉君 ; Qianhong Yu ; Xingliang Li…
• 关键词：Key wordsperovskite ; type ; SrTiO3 ; phase transition ; temperature ; leaching behavior
• 刊名：Journal of Wuhan University of Technology-Mater. Sci. Ed.
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：32
• 期：1
• 页码：89-93
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general;
• 出版者：Wuhan University of Technology
• ISSN：1993-0437
• 卷排序：32

文摘

A series of Sr_1–1.5xY_xTiO₃ (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 Sr_1–1.5xY_xTiO₃ (x=0–0.12) were investigated. Pure and single-phase perovskite-type Sr_1–1.5xY_xTiO₃ (x<0.08) solid solutions were obtained at 1 400 °C 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 Sr_1–1.5xY_xTiO₃ (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 Sr_1–1.5xY_xTiO₃ was controlled by its structural change.