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不同价态Cr离子对钙矾石形成与结构的影响
Influence of Cr Ions with Different Valence on the Formation and Structure of Ettringite
投稿时间:2017-09-22  修订日期:2017-11-17
DOI:103969/j.issn.1007 9629201804003
中文关键词:  钙矾石; Cr离子; 形成  晶格  影响
英文关键词:ettringite  Cr ion  formation  crystalline  influence
基金项目:国家重点基础研究发展计划(973计划)项目(2010CB735803)
              
作者单位
王昕
WANG Xin
北京工业大学材料科学与工程学院,北京100022
School of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
崔素萍
CUI Suping
北京工业大学材料科学与工程学院,北京100022
School of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
颜碧兰
YAN Bilan
中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024
State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
汪澜
WAN Lan
中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024
State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
张金山
ZHANG Jinshan
中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024
State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
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中文摘要:
      借助X射线衍射(XRD)、X射线光电子能谱分析(XPS)、扫描电镜(SEM)等测试方法,分析了不同价态Cr离子对水化液相中钙矾石的形成与晶体结构的影响.结果表明:Cr3+对水化初期钙矾石的形成略有抑制作用,钙矾石早期结晶极其细小,但水化后期钙矾石相大量形成,水化放热速率显著增强,且晶体结晶粗大,随水化龄期延长,钙矾石长径比逐渐缩小;Cr6+对水化初期钙矾石的形成有一定促进作用,钙矾石结晶良好,且后期晶体形态没有较大变化;水化液相中SO2-4含量充足时,Cr3+和Cr6+均可通过离子置换形成钙铬矾石,但前者对钙矾石晶体结构影响较大,使其Al和S电子结合能明显降低,而后者对钙矾石晶体结构影响较小.同时,Cr3+在钙矾石中的结合能和结合数量均高于Cr6+的结合能和结合数量.
英文摘要:
      The rules of the influence of Cr ions with different valence on the formation and the crystal structure of ettringite were investigated by means of X ray diffraction and X ray photoelectron spectroscopy analysis test. The results show that the Cr3+ions slightly influence the formation inhibition of ettringite, and its crystallization is extremely small on the early hydration phase, while it is formed greatly on the later hydration phase, and the crystallization become thick and big, and the ratio of length to diameter of the crystal becomes smaller along with the development of hydration. While Cr6+ions show a positive effect on the formation of ettringite at the early hydration stages, and the crystallization is well. There is no significant change on the crystalline form along with the development of hydration. When the SO2-4 content is plentiful on the hydration liquid phase, both Cr3+ions and Cr6+ions can form chromite ettringite through lattice ion substitution, and Cr3+ions have a larger influence on the crystal structure of ettringite than Cr6+, and Al and S atomic binding energy of ettringite shows a significant decrease. The combination energy and quantity of Cr3+ ions on ettringite are higher than that of Cr6+ions.
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