Novel Rhenium Carbides at 200 GPa. Issue 22 (14th May 2020)

• Record Type: Journal Article
• Authors: Khandarkhaeva, Saiana; Fedotenko, Timofey; Bykov, Maxim; Bykova, Elena; Chariton, Stella; Sedmak, Pavel; Glazyrin, Konstantin; Prakapenka, Vitali; Dubrovinskaia, Natalia; Dubrovinsky, Leonid
• Is Part Of: European journal of inorganic chemistry. Issue 22(2020)
• Page Start: 2186
• Page End: 2190
• Publication Date: 2020-05-14
• Subjects: Rhenium -- Carbon -- Carbides -- Structure elucidation -- High‐pressure chemistry; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202000252
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : Laser heating of rhenium in a diamond anvil cell to 3000±300 K at about 200 GPa results in formation of two previously unknown rhenium carbides, hexagonal WC‐type structured ReC and orthorhombic TiSi2 ‐type structured ReC2 . The shortest C–C distances [1.758(3) Å at 219(5) GPa and 1.850(4) Å at 180(7) GPa] found in honeycomb‐like carbon nets in the structure of ReC2 are quite unusual. The Re–C solid solution formed at multimegabar pressure has the carbon content of ≈ 20 at%. Abstract : In situ single‐crystal X‐ray diffraction studies of Re–C compounds formed by direct chemical reaction between diamond and rhenium in a pulsed laser‐heated double‐stage DAC at pressures of about 200 GPa are reported. A nano‐focused synchrotron X‐ray beam was used to determine four phases: Re2 C, ReC2, ReC, ReC0.2 . Two of them, WC‐type structured ReC and orthorhombic TiSi2 ‐type structured ReC2, have never been observed in the Re–C system, and ReC2 has an unusual structure.