Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 44, Pages 19112-19118Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp907665r
Keywords
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Funding
- NSYSU
- National Science Council, Taiwan [NSC95-2221-E-110-032-MY3]
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The gamma-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 gamma-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, its expected via a dynamic process, account for the Raman shift and UV-visible absorbance of Ti-doped gamma-Al2O3 for potential optoelectronic applications.
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