The crystallisation of Er-Si-Al-O-N B-phase glass-ceramics
The crystallisation of Er-Si-Al-O-N B-phase glass-ceramics
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DOI：
10.1007/s10853-005-2151-0
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发表时间：
2005-10
影响因子：
4.5
通讯作者：
Y. Menke;L. Falk;S. Hampshire
中科院分区：
文献类型：
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作者：
Y. Menke;L. Falk;S. Hampshire
采用透射电子显微镜和电子能谱成像技术研究了（e/o） 35Er:45Si:20Al:83O:17N玻璃结晶过程中微观结构的发展。在1050和1150℃下进行结晶热处理后，晶体具有广泛的组成；铒离子百分比在预期的b相组成（Er2SiAlO5N）附近变化，但铝含量略低，硅含量略高。此外，铒含量与硅含量呈强反相关关系。由钇、铒或镱形成的等效玻璃结晶后b相组成的比较表明，b相固溶体的范围取决于特定的阳离子半径。因此，对于等效玻璃，结晶程度和残余玻璃的组成也取决于阳离子半径。在1050℃下生长后晶体形状为透镜状，而在1150℃下热处理后晶体形状不规则。除了晶体生长外，结晶热处理还导致残余玻璃的相分离，从而形成较小的富含硅和氮的非晶特征。这些特征有效地固定了生长晶体的边界。
The development of microstructure during crystallisation of a glass with composition (e/o) 35Er:45Si:20Al:83O:17N has been studied by analytical transmission electron microscopy, including electron spectroscopic imaging. The crystals take up a wide range of composition after crystallisation heat treatment at 1050 and 1150°C; the erbium cation percentage varies around that of the expected B-phase composition (Er2SiAlO5N), but the aluminium content is slightly lower and the silicon content higher than that. In addition, the erbium content is strongly anti-correlated with the silicon content. A comparison of B-phase composition after crystallisation of equivalent glasses formed with either yttrium, erbium or ytterbium showed that the B-phase solid solution range depends on the particular cation radius. As a consequence of this, the degree of crystallisation and the composition of the residual glass will, for equivalent glasses, also depend on the cation radius. The crystal shape is lenticular after growth at 1050°C, while heat treatment at 1150°C results in crystals with an irregular shape. In addition to crystal growth, the crystallisation heat treatment results in a phase separation of the residual glass whereby smaller silicon and nitrogen rich amorphous features form. These features are effectively pinning boundaries of growing crystals.