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Journal of Materials Science

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22-05-2018 | Mechanochemical Synthesis

Synthesis of LaB₆–Al₂O₃ nanocomposite powders via ball milling-assisted annealing

Authors: Emre Tekoğlu, Ceren İmer, Duygu Ağaoğulları, M. Lütfi Öveçoğlu

Published in: Journal of Materials Science | Issue 19/2018

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Abstract

In this study, LaB₆–Al₂O₃ nanocomposite powders were synthesized via ball milling-assisted annealing process starting from La₂O₃–B₂O₃–Al powder blends. High-energy ball milling was conducted at various durations (0, 3, 6 and 9 h). Then, the milled powders were annealed at 1200 °C for 3 h under Ar atmosphere in order to obtain LaB₆ and Al₂O₃ phases as reaction products. X-ray diffractometry (XRD), scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS) and transmission electron microscopy (TEM) techniques were utilized to carry out microstructural characterization of the powders. No reaction between the reactants was observed in the XRD patterns of the milled powders, indicating that high-energy ball milling did not trigger any chemical reactions even after milling for 9 h. LaAlO₃ and LaBO₃ phases existed in the annealed powders which were milled for 0, 3 and 6 h. LaBO₃ phase was removed after HCl leaching. 9-h milled and annealed powders did not exhibit any undesired phases such as LaAlO₃ and LaBO₃ after leaching step, and pure nanocrystalline LaB₆–Al₂O₃ composite powders were successfully obtained. TEM analyses revealed that very fine LaB₆ particles (~ 100 nm) were embedded in coarse Al₂O₃ (~ 500 nm) particles.

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Title: Synthesis of LaB6–Al2O3 nanocomposite powders via ball milling-assisted annealing
Authors: Emre Tekoğlu
Ceren İmer
Duygu Ağaoğulları
M. Lütfi Öveçoğlu
Publication date: 22-05-2018
Publisher: Springer US
Published in: Journal of Materials Science / Issue 19/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-018-2454-6

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