Synthesis and structural characterization of Tm:Lu2O3 nanocrystals. An approach towards new laser ceramics |
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Authors: | E William BarreraM Cinta Pujol Concepción CascalesJoan J Carvajal X MateosMagdalena Aguiló Francesc Díaz |
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Affiliation: | a Física i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA), Universitat Rovira i Virgili (URV), Campus Sescelades, c/ Marcel.lí Domingo, s/n, E-43007 Tarragona, Spain b Instituto de Ciencia de Materiales de Madrid, CSIC, Calle Sor Juana Inés de la Cruz, Cantoblanco, E-28049 Madrid, Spain |
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Abstract: | Nanocrystals of Tm3+ Thulium doped cubic sesquioxides, Tm:Lu2O3, 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 × 10−6 K−1. 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 × 10−6 K−1. |
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Keywords: | Nanocrystals Sesquioxides Laser ceramics Linear thermal expansion Grain crystal growth |
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