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A Tungsten-Based Nanolaminated Ternary Carbide: (W,Ti)(4)C4-x
Journal article   Open access   Peer reviewed

A Tungsten-Based Nanolaminated Ternary Carbide: (W,Ti)(4)C4-x

Babak Anasori, Jun Lu, Oleg Rivin, Martin Dahlqvist, Joseph Halim, Cooper Voigt, Johanna Rosen, Lars Hultman, Michel W. Barsoum and El'ad N. Caspi
Inorganic chemistry, v 58(2), pp 1100-1106
21 Jan 2019
PMID: 30608675
url
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-154693View

Abstract

Chemistry Chemistry, Inorganic & Nuclear Physical Sciences Science & Technology
Nanolamellar transition metal carbides are gaining increasing interests because of the recent developments of their twodimensional (2D) derivatives and promising performance for a variety of applications from energy storage, catalysis to transparent conductive coatings, and medicine. To develop more novel 2D materials, new nanolaminated structures are needed. Here we report on a tungsten based nanolaminated ternary phase, (W,Ti)(4)C4-x, synthesized by an Al catalyzed reaction of W, Ti, and C powders at 1600 degrees C for 4 h, under flowing argon. X-ray and neutron diffraction, along with Z-contrast scanning transmission electron microscopy, were used to determine the atomic structure, ordering, and occupancies. This phase has a layered hexagonal structure (P6(3)/mmc) with lattice parameters, a = 3.00880(7) angstrom, and c = 19.5633(6) angstrom and a nominal chemistry of (W,Ti)(4)C4-x (actual chemistry, W2.1(1)Ti1.6(1)C2.6(1)). The structure is comprised of layers of pure W that are also twin planes with two adjacent atomic layers of mixed W and Ti, on either side. The use of Al as a catalyst for synthesizing otherwise difficult to make phases, could in turn lead to the discovery of a large family of nonstoichiometric ternary transition metal carbides, synthesized at relatively low temperatures and shorter times.

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Web of Science research areas
Chemistry, Inorganic & Nuclear
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