New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium Full article

Journal

Journal of the American Ceramic Society
ISSN: 0002-7820

Output data

Year: 2022, Volume: 105, Number: 3, Pages: 2323-2333 Pages count : 11 DOI: 10.1111/jace.18234

Tags

electron microscopy, hafnium diboride, hardness, iridium, transition metal ternary borides

Authors

Lozanov Victor V. ¹ , Utkin Aleksei V. ¹ , Gavrilova Tatyana A. ² , Titov Anatoly T. ³ , Beskrovny Anatoly I. ⁴ , Letyagin Gleb A. ⁵ , Romanenko Galina V. ⁵ , Baklanova Natalya I. ¹

Affiliations

1	Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2	Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
3	V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
4	Joint Institute for Nuclear Research, Dubna, Russia
5	International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

A variety of the ternary Hf–Ir–B phases formed via the reaction between iridium and hafnium diboride at elevated temperatures was found. The data on the phase and elemental composition, as well as crystal structure, obtained by powder and single-crystal X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray spectrometer, and time-of-flight neutron diffraction analysis unambiguously confirm that HfIr3Bx solid solution, two known ternary borides (HfIr3B4, Hf2Ir5B2), as well as two novel ternary HfIr2.1B1.3 and HfIr5.7B2.7 phases, are formed at elevated temperatures. This result is fundamentally different from that previously obtained by us for the Hf–Ir–C system in which only one binary intermetallic compound, HfIr3, was produced. The measured Vickers microhardness for all the aforementioned ternary borides (13–19GPa) allows us to consider them hard. The coefficients of thermal expansion of ternary borides were measured by in situ high-temperature X-ray analysis.

Lozanov V.V. , Utkin A.V. , Gavrilova T.A. , Titov A.T. , Beskrovny A.I. , Letyagin G.A. , Romanenko G.V. , Baklanova N.I.
New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium
Journal of the American Ceramic Society. 2022. V.105. N3. P.2323-2333. DOI: 10.1111/jace.18234 WOS Scopus

Published online:	Nov 15, 2021
Published print:	Mar 1, 2022

Web of science:	WOS:000720680800001
Scopus:	2-s2.0-85119422036

DB	Citing
Scopus	11
Web of science	11