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

Emre Tekoğlu*, Ceren İmer, Duygu Ağaoğulları, M. Lütfi Öveçoğlu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)13538-13549
Number of pages12
JournalJournal of Materials Science
Volume53
Issue number19
DOIs
Publication statusPublished - 1 Oct 2018

Bibliographical note

Publisher Copyright:
© 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Funding

This study was funded by ‘‘The Scientific and Technological Research Council of Turkey (TÜBİTAK)’’ with the project number 214M093. This study was financially supported by The Scientific and Technological Research Council of Turkey (TUBITAK) through a research project (# 214M093). We also acknowledge Prof. Dr. Cüneyt Arslan and M.Sc. Emre Yılmaz for their assistance in using the HSC ChemistryTM Ver. 9.0.7 program.

FundersFunder number
TUBITAK
TÜBİTAK
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu214M093

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