Synthesis of Ti3AuC2, Ti3Au2C2 and Ti3IrC2 by noble metal substitution reaction in Ti3SiC2 for high-temperature-stable Ohmic contacts to SiC

Fashandi, Hossein; Dahlqvist, Martin; Lu, Jun; Pališaitis, Justinas; Simak, Sergei I.; Abrikosov, Igor A.; Rosén, Johanna; Hultman, Lars; Andersson, Mike; Spetz, Anita Lloyd; Eklund, Per

doi:10.1038/nmat4896

Cited by 174 publications

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“…19 Recently, several new MAX phase and related nanolaminated carbides have been reported, such as Ti 3 AuC 2 , Ti 3 Au 2 C 2 , Mo 2 AuC, and Mo 2 Au 2 C, synthesized by solid state reaction between the Au capping layers and the underlying nanolaminated carbide thin films (e.g., Ti 3 SiC 2 and Mo 2 Ga 2 C) at elevated temperature. [23][24][25] After the annealing, the interplanar spacing of the carbides expanded along the c-axis (denoted as out-of-plane direction in the following discussion). Substitution of Si, Al, and Ga by Au was observed using scanning transmission electron microscopy (STEM), where the chemical analysis showed the possibility of both partial substitution and full substitution.…”

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confidence: 99%

“…Substitution of Si, Al, and Ga by Au was observed using scanning transmission electron microscopy (STEM), where the chemical analysis showed the possibility of both partial substitution and full substitution. [23][24][25] Along with the discovery of a new A element and additional members of the MAX phase family, it was also shown that the Ti 3 Au 2 C 2 phase can further react with an Ir capping layer, forming yet another nanolaminated phase, Ti 3 IrC 2 . This points towards a fully reversible intercalation of Au in the MAX phase, with Au diffusing in and out of the A layer without any substantial change of the metal carbide, e.g., Ti 3 C 2 , layers.…”

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confidence: 99%

“…Excess Ga likely diffuses to the surface to form oxides, similar to observations made for Si and Al. 23,24 Figure 3 36 A decrease of magnetization ( Fig. 3) with increasing temperature is the result of the transition to a paramagnetic (PM) state at the critical temperature (T C ) above 220 K. 22 The split of the ZFC and the FC curves, as well as the non-monotonous temperature dependence of the ZFC curve in Fig.…”

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confidence: 99%

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Magnetic properties and structural characterization of layered (Cr0.5Mn0.5)2AuC synthesized by thermally induced substitutional reaction in (Cr0.5Mn0.5)2GaC

et al. 2018

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The magnetic properties of the new phase (Cr0.5Mn0.5)2AuC are compared to the known MAX-phase (Cr0.5Mn0.5)2GaC, where the former was synthesized by thermally induced substitution reaction of Au for Ga in (Cr0.5Mn0.5)2GaC. The reaction introduced a lattice expansion of ∼3% along the c-axis, an enhancement of the coercive field from 30 mT to 140 mT, and a reduction of the Curie temperature and the saturation magnetization. Still, (Cr0.5Mn0.5)2AuC displays similar features in the magnetic field- and temperature-dependent magnetization curves as previously reported magnetic MAX phases, e.g., (Cr0.5Mn0.5)2GaC and (Mo0.5Mn0.5)2GaC. The work suggests a pathway for tuning the magnetic properties of MAX phases.

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confidence: 99%

Section: All Article Content Except Where Otherwise Noted Is Licensmentioning

confidence: 99%

Section: All Article Content Except Where Otherwise Noted Is Licensmentioning

confidence: 99%

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Magnetic properties and structural characterization of layered (Cr0.5Mn0.5)2AuC synthesized by thermally induced substitutional reaction in (Cr0.5Mn0.5)2GaC

et al. 2018

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“…Ti3AuC2 and Ti3Au2C2, synthesized by thermally induced exchange reaction of Au into the Si layers of Ti3SiC2 thin films [53]. The authors reported that the Au-containing phases retained the nanolaminated structures and served as a high-temperature-stable Ohmic electrical contact with the underlying SiC substrate [53].…”

Section: Most Recently Fashandi Et Al Have Reported On New Max Andmentioning

confidence: 99%

“…The authors reported that the Au-containing phases retained the nanolaminated structures and served as a high-temperature-stable Ohmic electrical contact with the underlying SiC substrate [53].…”

Section: Most Recently Fashandi Et Al Have Reported On New Max Andmentioning

confidence: 99%

Phase Formation of Nanolaminated Transition Metal Carbide Thin Films

Lai¹

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The cover image is a simple sketch of structural-chemical relation in between the metal layers in nanolaminated transition metal carbides: Mo2GaC, Mo2Ga2C, and Mo2(Au1-xGax)2C with an in-plane order in the Au-Ga layers, where the last two phases were discovered in this thesis. © Chung-Chuan Lai 2017Printed in Sweden by LiU-Tryck 2017 ISSN 0345-7524 ISBN 978-91-7685-526-3 i AbstractResearch on inherently nanolaminated transition metal carbides is inspired by their unique properties combining metals and ceramics, such as higher damage tolerance, better machinability and lower brittleness compared to the binary counterparts, yet retaining the metallic conductivity. The interesting properties are related to their laminated structure, composed of transition-metal carbide layers interleaved by non-transition-metal (carbide) layers. These materials in thin-film form are particularly interesting for potential applications such as protective coatings and electrical contacts. The goal of this work is to explore nanolaminated transition metal carbides from the aspects of phase formation and crystal growth during thin-film synthesis. This was realized by studying phases in select material systems synthesized from two major approaches, namely, from direct-deposition and post-deposition treatment.The first approach was used in studies on the Mo-Ga-C and Zr-Al-C systems. In the former system, intriguing properties have been predicted for the 3D phases and their 2D derivatives (so called MXenes), while in the latter system, the phases are interesting for nuclear applications.In this work, the discovery of a new Mo-based nanolaminated ternary carbide, Mo2Ga2C, is evidenced from thin-film and bulk processes. Its structure was determined using theoretical and experimental techniques, showing that Mo2Ga2C has Ga double-layers in simple hexagonal stacking between adjacent Mo2C layers, and therefore is structurally very similar to Mo2GaC, except for the additional Ga layers. For the Zr-Al-C system, the optimization of phase composition and structure of Zr2Al3C4 in a thin-film deposition process was studied by evaluating the effect of deposition parameters. I concluded that the formation of Zr2Al3C4 is favored with a plasma flux overstoichiometric in Al, and with a minimum lattice-mismatch to the substrates. Consequently, epitaxial Zr2Al3C4 thin film of high quality were deposited on 4H-SiC(001) substrates at 800 °C.With the approach of post-deposition treatment, the studies were focused on a new method of thermally-induced selective substitution reaction of Au for the non-transition-metal layers in nanolaminated carbides. Here, the reaction mechanism has been explored in Al-containing (Ti2AlC and Ti3AlC2) and Ga-containing (Mo2GaC and Mo2Ga2C) phases. The Al and Ga in ii these phases were selectively replaced by Au while the carbide layers remained intact, resulting in the formation of new layered phases, Ti2Au2C, Ti3Au2C2, Mo2AuC, and Mo2(Au1-xGax)2C, respectively. The substitution reaction was explained by fast outward diffus...

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2D Transition Metal Carbides (MXenes) for Applications in Electrocatalysis

Laishram

Kumar

Shejale

et al. 2022

Heterogeneous Nanocatalysis for Energy and Environmental Sustainability

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Synthesis of Ti3AuC2, Ti3Au2C2 and Ti3IrC2 by noble metal substitution reaction in Ti3SiC2 for high-temperature-stable Ohmic contacts to SiC

Abstract: they were stored in room-air after the annealing procedure and prior to the SEM/EDX study. 100The Si content of the A layers in the novel structure is negligible, based on EDX results, and and what is present in similar systems, see S3 and S6. These calculations showed that 115

Cited by 174 publications

References 36 publications

Magnetic properties and structural characterization of layered (Cr0.5Mn0.5)2AuC synthesized by thermally induced substitutional reaction in (Cr0.5Mn0.5)2GaC

Magnetic properties and structural characterization of layered (Cr0.5Mn0.5)2AuC synthesized by thermally induced substitutional reaction in (Cr0.5Mn0.5)2GaC

Phase Formation of Nanolaminated Transition Metal Carbide Thin Films

2D Transition Metal Carbides (MXenes) for Applications in Electrocatalysis

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