Universität zu Köln

Bykova, Elena, Ovsyannikov, Sergey, V, Bykov, Maxim ORCID: 0000-0003-0248-1728, Yin, Yuqing, Fedotenko, Timofey, Holz, Hendrik ORCID: 0000-0002-6525-359X, Gabel, Stefan ORCID: 0000-0003-3358-3321, Merle, Benoit, Chariton, Stella, Prakapenka, Vitali B., Dubrovinskaia, Natalia, Goncharov, Alexander F. and Dubrovinsky, Leonid (2022). Synthesis, crystal structure, and properties of stoichiometric hard tungsten tetraboride, WB4. J. Mater. Chem. A, 10 (37). S. 20111 - 20121. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7496

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Abstract

Tungsten tetraboride has been known so far as a non-stoichiometric compound with a variable composition (e.g. WB4-x, WB4+x). Its mechanical properties could exceed those of hard tungsten carbide, which is widely used nowadays in science and technology. The existence of stoichiometric WB4 has not been proven yet, and its structure and crystal chemistry remain debatable to date. Here we report the synthesis of single crystals of the stoichiometric WB4 phase under high-pressure high-temperature conditions. The crystal structure of WB4 was determined using synchrotron single-crystal X-ray diffraction. In situ high-pressure compressibility measurements show that the bulk modulus of WB4 is 238.6(2) GPa for B ' = 5.6(0). Measurements of mechanical properties of bulk polycrystalline sub-millimeter size samples under ambient conditions reveal a hardness of similar to 36 GPa, confirming that the material falls in the category of superhard materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bykova, Elena UNSPECIFIED UNSPECIFIED UNSPECIFIED Ovsyannikov, Sergey, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Bykov, Maxim UNSPECIFIED orcid.org/0000-0003-0248-1728 UNSPECIFIED Yin, Yuqing UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedotenko, Timofey UNSPECIFIED UNSPECIFIED UNSPECIFIED Holz, Hendrik UNSPECIFIED orcid.org/0000-0002-6525-359X UNSPECIFIED Gabel, Stefan UNSPECIFIED orcid.org/0000-0003-3358-3321 UNSPECIFIED Merle, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED Chariton, Stella UNSPECIFIED UNSPECIFIED UNSPECIFIED Prakapenka, Vitali B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubrovinskaia, Natalia UNSPECIFIED UNSPECIFIED UNSPECIFIED Goncharov, Alexander F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubrovinsky, Leonid UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-691167
DOI:	10.1039/d2ta02268k
Journal or Publication Title:	J. Mater. Chem. A
Volume:	10
Number:	37
Page Range:	S. 20111 - 20121
Date:	2022
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7496
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MECHANICAL-PROPERTIES; ELASTIC-MODULUS; SUPERHARD; PRESSURE; BORIDE; TRANSITION; INDENTATION; DIFFRACTION; SYSTEM Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69116