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

Duygu Ağaoğulları; Özge Balcı; M. Lütfi Öveçoğlu; İsmail Duman

doi:10.1007/s41779-017-0139-2

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

Department of Metallurgical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

5 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 language	English
Pages (from-to)	177-190
Number of pages	14
Journal	Journal of the Australian Ceramic Society
Volume	54
Issue number	1
DOIs	https://doi.org/10.1007/s41779-017-0139-2
Publication status	Published - 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.

Funders	Funder number
TÜBİTAK	109M364
International Technological University
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi	33549

Keywords

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

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10.1007/s41779-017-0139-2

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title = "Effects of milling parameters on the microstructural and thermal properties of nanocrystalline lanthanum hexaboride powders",

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{\texttrademark} 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.",

keywords = "Acid leaching, Lanthanum hexaboride, Mechanochemical synthesis, Microstructural properties, Milling parameters, Thermal properties",

author = "Duygu Ağaoğulları and {\"O}zge Balcı and \{L{\"u}tfi {\"O}ve{\c c}oğlu\}, M. and İsmail Duman",

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doi = "10.1007/s41779-017-0139-2",

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AU - Ağaoğulları, Duygu

AU - Balcı, Özge

AU - Lütfi Öveçoğlu, M.

AU - Duman, İsmail

PY - 2018/3/1

Y1 - 2018/3/1

N2 - 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.

AB - 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.

KW - Acid leaching

KW - Lanthanum hexaboride

KW - Mechanochemical synthesis

KW - Microstructural properties

KW - Milling parameters

KW - Thermal properties

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DO - 10.1007/s41779-017-0139-2

M3 - Article

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SN - 2510-1560

VL - 54

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JO - Journal of the Australian Ceramic Society

JF - Journal of the Australian Ceramic Society

IS - 1

ER -

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

Abstract

Bibliographical note

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Keywords

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