首页> 外文期刊>Journal of the American Ceramic Society >Evolution of the Ni~(2+) Environment During the Formation of a MgO-Al_2O_3-SiO_2 Glass-Ceramic: A Combined XRD and Diffuse Reflectance Spectroscopy Approach
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Evolution of the Ni~(2+) Environment During the Formation of a MgO-Al_2O_3-SiO_2 Glass-Ceramic: A Combined XRD and Diffuse Reflectance Spectroscopy Approach

机译:MgO-Al_2O_3-SiO_2微晶玻璃形成过程中Ni〜(2+)环境的演化:XRD与漫反射光谱相结合的方法

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摘要

The effect of the addition of NiO on the crystallization mechanisms has been studied for SiO_2-Al_2O_3-MgO glass-ceramics. A detailed Rietveld analysis has been made to determine the chemical composition and the cation distribution in the spinel phase and the evolution of Ni~(2+) coordination site using diffuse reflectance spectroscopy. Powder X-ray diffraction (XRD) results show the formation of β-quartz and spinel and the nickel fraction in the spinel phase decreasing as the plateau temperature increases. The determination of cation distribution in spinel using XRD reveals a preference of Ni~(2+) and Al~(3+) for octahedral sites and an increasing proportion of Ni~(2+) in tetra-hedral sites for heat treatments at high temperature (1100℃-1200℃). Diffuse reflectance spectroscopy shows that Ni~(2+) is mainly fivefold coordinated in the starting glass, playing an important role in the crystallization of the spinel phase and it confirms the presence of tetrahedral and octahedral Ni~(2+) in the glass-ceramics. The combination of these two techniques also indicates a chemical heterogeneity of spinel crystals with Ni~(2+) -rich and Mg~(2+)-rich zones.
机译:研究了SiO_2-Al_2O_3-MgO玻璃陶瓷中添加NiO对结晶机理的影响。进行了详细的Rietveld分析,以使用漫反射光谱法确定尖晶石相中的化学成分和阳离子分布以及Ni〜(2+)配位点的演变。粉末X射线衍射(XRD)结果表明,随着平台温度的升高,β-石英和尖晶石的形成以及尖晶石相中镍的含量降低。利用X射线衍射测定尖晶石中的阳离子分布表明,Ni_(2+)和Al〜(3+)偏爱八面体位点,而Ni〜(2+)在四面体位点中所占比例越来越高,以进行高温热处理温度(1100℃-1200℃)。漫反射光谱法表明,Ni〜(2+)在起始玻璃中主要是五配位的,在尖晶石相的结晶中起重要作用,并证实了在玻璃中存在四面体和八面体的Ni〜(2+)。陶瓷。这两种技术的结合还表明尖晶石晶体的化学异质性具有富Ni〜(2+)和富Mg〜(2+)区。

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  • 来源
    《Journal of the American Ceramic Society》 |2012年第11期|3483-3489|共7页
  • 作者单位

    Institut de mineralogie et de physique des milieux condenses, Universite Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France;

    Institut de mineralogie et de physique des milieux condenses, Universite Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France;

    Institut de mineralogie et de physique des milieux condenses, Universite Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France,Cite de la Ceramique, 2 place de la manufacture, 92310 Sevres, France;

    Institut de mineralogie et de physique des milieux condenses, Universite Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France;

    Institut de mineralogie et de physique des milieux condenses, Universite Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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  • 入库时间 2022-08-17 13:39:01

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