Laser Ablation Condensation, Coalescence, and Phase Change of Dense -Al2O3 Particles

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• 作者：Chiennan Pan ; Shuei-Yuan Chen ; Pouyan Shen
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：December 7, 2006
• 年：2006
• 卷：110
• 期：48
• 页码：24340 - 24345
• 全文大小：972K
• 年卷期：v.110,no.48(December 7, 2006)
• ISSN：1520-5207

文摘

Dense -Al₂O₃ condensates, with residual stress up to 3 GPa and ranging from nanometer to an unexpectedmicrometer size, were formed by pulsed laser ablation on Al target under oxygen background gas for a veryrapid heating and cooling effect. Analytical electron microscopic observations indicated such nanoparticlestended to coalesce over {111} facets to form multiple twin and tilt boundary. The micrometer-size particleschanged, upon electron irradiation, into metastable orthorhombic form full of twin variants and faults parallelto {100}.