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:
CreatorsEmailORCIDORCID Put Code
Bykova, ElenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ovsyannikov, Sergey, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bykov, MaximUNSPECIFIEDorcid.org/0000-0003-0248-1728UNSPECIFIED
Yin, YuqingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fedotenko, TimofeyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Holz, HendrikUNSPECIFIEDorcid.org/0000-0002-6525-359XUNSPECIFIED
Gabel, StefanUNSPECIFIEDorcid.org/0000-0003-3358-3321UNSPECIFIED
Merle, BenoitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chariton, StellaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prakapenka, Vitali B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dubrovinskaia, NataliaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goncharov, Alexander F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dubrovinsky, LeonidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
MECHANICAL-PROPERTIES; ELASTIC-MODULUS; SUPERHARD; PRESSURE; BORIDE; TRANSITION; INDENTATION; DIFFRACTION; SYSTEMMultiple languages
Chemistry, Physical; Energy & Fuels; Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69116

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