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
Chang-Zhong Liao;   Chengshuai Liu;  Po-Heng Lee;  Martin C. Stennett;  Neil C. Hyatt;  Kaimin Shih
刊名Crystal Growth and Design
2017
卷号17期号:3页码:1079-1087
英文摘要

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 °C. The size of the cubic-zirconia crystal could be controlled by temperature and dwelling time. Both cubic-zirconia 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 ∼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.

语种英语
内容类型期刊论文
源URL[http://ir.gyig.ac.cn/handle/42920512-1/8369]  
专题地球化学研究所_环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550009, P. R. China
2.Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, P. R. China
3.Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR
4.Immobilisation Science Laboratory, Department of Materials Science and Engineering, The University of Sheffield, Sheffield S1 3JD, U.K
5.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, P. R. China
推荐引用方式
GB/T 7714
Chang-Zhong Liao; Chengshuai Liu;Po-Heng Lee;Martin C. Stennett;Neil C. Hyatt;Kaimin Shih. 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[J]. Crystal Growth and Design,2017,17(3):1079-1087.
APA Chang-Zhong Liao; Chengshuai Liu;Po-Heng Lee;Martin C. Stennett;Neil C. Hyatt;Kaimin Shih.(2017).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.Crystal Growth and Design,17(3),1079-1087.
MLA Chang-Zhong Liao; Chengshuai Liu;Po-Heng Lee;Martin C. Stennett;Neil C. Hyatt;Kaimin Shih."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".Crystal Growth and Design 17.3(2017):1079-1087.
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