✦ LIBER ✦

Synthesis and structural characterization of Tm:Lu2O3 nanocrystals. An approach towards new laser ceramics

✍ Scribed by E. William Barrera; M. Cinta Pujol; Concepción Cascales; Joan J. Carvajal; X. Mateos; Magdalena Aguiló; Francesc Díaz

Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 750 KB
Volume: 33
Category: Article
ISSN: 0925-3467
DOI: 10.1016/j.optmat.2010.09.015

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✦ Synopsis

Nanocrystals of Tm 3+ Thulium doped cubic sesquioxides, Tm:Lu 2 O 3 , with a maximum size around 30 nm have been synthesized by a modified Pechini sol-gel method. The calcination temperature for the synthesis is 1073 K. Electron microscopy was used to analyze the presence of aggregates, and the type of boundary between the nanocrystals. The linear coefficient of thermal expansion for these nanocrystals has been determined to be around 7.5 Â 10 À6 K À1 . The growth of the nanocrystals has been studied in terms of temperature and time. Nanocrystals start to grow at temperatures around 1267 K. Finally, the grain growth activation energy of this material has been evaluated to be 76 kJ/mol, indicating a diffusion growth mechanism. Linear thermal expansion of prepared nanocrystals is %7.5 Â 10 À6 K À1 .

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