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首页> 外文期刊>Crystal growth & design >Combined Quantitative X-ray Diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy Investigations of Crystal Evolution in CaO-Al2O3-SiO2-TiO2-ZrO2-Nd2O3-Na2O System
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Combined Quantitative X-ray Diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy Investigations of Crystal Evolution in CaO-Al2O3-SiO2-TiO2-ZrO2-Nd2O3-Na2O System

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摘要

Glass-ceramics, with a specific crystalline phase assembly, can combine the advantages of glass and ceramic and avoid their disadvantages. In this study, both cubic-zirconia and zirconolite-based glass-ceramics were obtained by the crystallization of SiO2-CaO-Al2O3-TiO2-ZrO2-Nd2O3-Na2O glass. Results show that all samples underwent a phase transformation from cubic-zirconia to zirconolite when crystallized at 900, 950, and 1000 degrees C. The size of the cubic-zirconia crystal could be controlled by temperature and dwelling time. Both cubiczirconia and zirconolite crystals/particles show dendrite shapes, but with different dendrite branching. The dendrite cubic-zirconia showed highly oriented growth. Scanning electron microscopy images show that the branches of the cubic-zirconia crystal had a snowflake-like appearance, while those in zirconolite were composed of many individual crystals. Rietveld quantitative analysis revealed that the maximum amount of zirconolite was similar to 19 wt . A two-stage crystallization method was used to obtain different microstructures of zirconolite-based glass-ceramic. The amount of zirconolite remained approximately 19 wt , but the individual crystals were smaller and more homogeneously dispersed in the dendrite structure than those obtained from one-stage crystallization. This process-control feature can result in different sizes and morphologies of cubic-zirconia and zirconolite crystals to facilitate the design of glass-ceramic waste forms for nuclear wastes.

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  • 来源
    《Crystal growth & design》 |2017年第3期|1079-1087|共9页
  • 作者

    Liao Chang-Zhong; Liu Chengshuai; Lee Po-HengStennett Martin C.Hyatt Neil C.Shih Kaimin;

  • 作者单位

    Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China;

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550009, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Sheffield, Dept Mat Sci & Engn, Immobilisat Sci Lab, Sheffield S1 3JD, S Yorkshire, EnglandUniv Hong Kong, Dept Civil Engn, Pokfulam, Hong Kong, Peoples R China;

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  • 正文语种 英语
  • 中图分类 晶体学;
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