Three-Dimensional Structure of CeO2 Nanodendrites in Glass

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• 作者：Xiaojing Xu ; Zineb Saghi ; Guang Yang ; Russell J. Hand ; Gü ; nter Mö ; bus
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：8
• 期：4
• 页码：1102 - 1105
• 全文大小：1002K
• 年卷期：v.8,no.4(April 2008)
• ISSN：1528-7505

文摘

Electron tomography is used to reconstruct for the first time a nanoscale dendrite precipitated from and embedded in glass in full three dimensions. In combination with electron diffraction, the branching geometry of CeO₂ nanodendrites is evaluated in relation to their crystallography. We find that the branches of the dendrite fill a virtual octahedral hull, similar to the surface-morphology commonly found in free-standing CeO₂ nanoparticles. The octahedral facets correspond to {111} planes, while the primary branch growth direction is <100>. Such fluorite structured ceria precipitates in alkali-borosilicate glasses, generated by melting plus annealing, have high relevance for research fields ranging from radionuclide immobilization to glass ceramic materials and nucleation. Tomographic reconstruction enables apart from qualitative morphology studies quantitative evaluation for dendrite fill factors.