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AlLB14 (L=Li or Na or K) crystals were grown using LiF or NaF or KF and crystalline boron powders as the starting materials using high-temperature Al melt at soaking temperature 1573~1773 K for soaking time 5 h under an Ar atmosphere. A new compound AlNaB14 and AlLiB14 crystals were obtained from LiF or NaF and B powders, and the atomic ratios (n=B/L=2.0~4.0) of starting materials. AlKB14 crystal was not obtained from KF and B powders as starting materials. The micro-Vickers hardness of AlLB14 crystals is 24(±1) GPa for AlLiB14 and 25(±1) GPa for AlNaB14. The oxidation initiation temperature of AlLiB14 was about 815 K, and the peak due to the exothermic reaction was about 960 K for AlLiB14 and about 990 K for AlNaB14. The final oxidation products were Li2B2O4, Al4B2O9, B2O3 and amorphous phases.

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  This is the version of the article before peer review or editing, as submitted by an author to Japanese Journal of Applied Physics.  IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it.  The Version of Record is available online at https://dx.doi.org/10.35848/1347-4065/ad6659

Keyword: boride

Date published: 2024-08-01

Publisher: IOP Publishing

Journal:

• Japanese Journal of Applied Physics (ISSN: 13474065) vol. 63 issue. 8 p. 85504-85504 085504

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Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4809

First published URL: https://doi.org/10.35848/1347-4065/ad6659

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Updated at: 2024-10-09 08:30:14 +0900

Published on MDR: 2024-10-09 08:30:15 +0900