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Formation of six-coordinated silicon in calcium phosphosilicate xerogels assisted by polyols at low temperature and pressure

Ai-Ling Li ,  Yan-Ping Ma ,  Dong Qiu

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Citation:  Ai-Ling Li, Yan-Ping Ma, Dong Qiu. Formation of six-coordinated silicon in calcium phosphosilicate xerogels assisted by polyols at low temperature and pressure[J]. Chinese Chemical Letters, 2015, 26(6): 768-772. doi: 10.1016/j.cclet.2015.03.004 shu

Formation of six-coordinated silicon in calcium phosphosilicate xerogels assisted by polyols at low temperature and pressure

    • 通讯作者: Ai-Ling Li,
    Dong Qiu,
  • 基金项目:

    This work was supported by the State Key Development Program of Basic Research of China (No. 2012CB933200)  (No. 2012CB933200)

    National Natural Science Foundation of China (No. 51173193). (No. 51173193)

摘要: Silicon is usually found to be four-coordinated when neighbored with oxygen. Six-coordinated silicon is only seen in samples at very specific composition or made at high temperature/pressure. In this study, we managed to synthesize calciumphosphosilicate xerogels containing six-coordinated silicon with the help of polyols by sol-gel method, without the need of treatment at high temperature or high pressure. Both phosphorus precursors and polyols were found to be essential for the formation of six-coordinated silicon species; in the absence of either species, only normal four-coordinated silicon was observed under otherwise identical conditions. Samples containing six-coordinated silicon sites were found to release silicon species faster than those without six-coordinated silicon sites upon dissolved in water, suggesting that six-coordinated silicon species have higher reactivity toward hydrolysis.

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  • 发布日期:  2015-03-09
  • 收稿日期:  2014-11-03
  • 网络出版日期:  2015-02-09
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