Effects of milling parameters on the microstructural and thermal properties of nanocrystalline lanthanum hexaboride powders

Duygu Ağaoğulları*, Özge Balcı, M. Lütfi Öveçoğlu, İsmail Duman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This study reports the effects of some milling parameters (duration, ball-to-powder weight ratio (BPR), process control agent (PCA)) on the fabrication of nanocrystalline LaB6 powders via a combined process of mechanochemical synthesis (MCS) and acid leaching, starting from La2O3-B2O3-Mg powder blends. MCS was carried out in a high-energy ball mill (SPEX™ 8000D Mixer/Mill, at 1200 rpm) using hardened steel vial and balls under Ar atmosphere. As-synthesized products were leached out with 4 M HCl from unwanted MgO phase and probable Fe impurities. When a BPR of 18:1 was used, 5 h of MCS and leaching yielded LaB6 powders with an average particle size of 100 nm, containing a very small amount of FeB49 phase. Pure LaB6 powders were obtained with an average particle size of 53 nm after 12 h of MCS of the 0.5 wt% PCA added La2O3-B2O3-Mg powder blends with a BPR of 10:1 and after leaching.

Original languageEnglish
Pages (from-to)177-190
Number of pages14
JournalJournal of the Australian Ceramic Society
Volume54
Issue number1
DOIs
Publication statusPublished - 1 Mar 2018

Bibliographical note

Publisher Copyright:
© 2017, Australian Ceramic Society.

Funding

This study was supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK) with the project title of “Synthesis of Lanthanum, Cerium and Samarium Borides by Solid-State Reaction at Room Temperature” and with the project number of 109M364. It was also funded by Istanbul Technical University Scientific Research Projects with the project title of “Mechanochemical Synthesis and Characterization of Some Rare-Earth Metal Borides” and with the project number of 33549. Acknowledgements This study was supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK) with the project title of BSynthesis of Lanthanum, Cerium and Samarium Borides by Solid-State Reaction at Room Temperature^ and with the project number of 109M364. It was also funded by Istanbul Technical University Scientific Research Projects with the project title of BMechanochemical Synthesis and Characterization of Some Rare-Earth Metal Borides^ and with the project number of 33549.

FundersFunder number
TÜBİTAK109M364
International Technological University
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi33549

    Keywords

    • Acid leaching
    • Lanthanum hexaboride
    • Mechanochemical synthesis
    • Microstructural properties
    • Milling parameters
    • Thermal properties

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