On the Enhanced Solute Content, Shape, Defect Microstructures, and Optical Properties of Ti-Doped γ-Al2O3 Nanocondensates

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• 作者：Chun-Hung Lin ; Chang-Ning Huang ; Shuei-Yuan Chen ; Yuyuan Zheng ; Pouyan Shen
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：November 5, 2009
• 年：2009
• 卷：113
• 期：44
• 页码：19112-19118
• 全文大小：736K
• 年卷期：v.113,no.44(November 5, 2009)
• ISSN：1932-7455

文摘

The γ-Al₂O₃ condensates with increased solid solubility (up to ca. 4 atomic %) of Ti, mainly Ti³⁺ and minor Ti²⁺/Ti⁴⁺ according to X-ray photoelectron spectroscopy, were synthesized by laser ablation condensation in air. Transmission electron microscopy indicated that the nearly spherical condensates were nano- to submicrometer in size having {111} facets for mutual coalescence to form twin or single crystals. The Ti-doped γ-Al₂O₃ condensates are vulnerable to electron irradiation by forming pits bound by {111}, {110}, and {001} faces with 0, 1, and 2 periodic bond chain in terms of the edge-shared octahedral, respectively, followed by a polygonization or amorphization/recrystallization process. The incorporation of a higher concentration of dopant and the internal stress, as expected via a dynamic process, account for the Raman shift and UV−visible absorbance of Ti-doped γ-Al₂O₃ for potential optoelectronic applications.