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From MAX Phase Carbides to Nitrides: Synthesis of V₂GaC, V₂GaN, and the Carbonitride V₂GaC₁-ₓNₓ

Kubitza, Niels; Reitz, Andreas; Zieschang, Anne-Marie; Pazniak, Hanna; Albert, Barbara; Kalha, Curran; Schlueter, Christoph; ... Birkel, Christina S; + view all (2022) From MAX Phase Carbides to Nitrides: Synthesis of V₂GaC, V₂GaN, and the Carbonitride V₂GaC₁-ₓNₓ. Inorganic Chemistry , 61 (28) pp. 10634-10641. 10.1021/acs.inorgchem.2c00200. Green open access

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Abstract

The research in MAX phases is mainly concentrated on the investigation of carbides rather than nitrides (currently >150 carbides and only <15 nitrides) that are predominantly synthesized by conventional solid-state techniques. This is not surprising since the preparation of nitrides and carbonitrides is more demanding due to the high stability and low diffusion rate of nitrogen-containing compounds. This leads to several drawbacks concerning potential variations in the chemical composition of the MAX phases as well as control of morphology, the two aspects that directly affect the resulting materials properties. Here, we report how alternative solid-state hybrid techniques solve these limitations by combining conventional techniques with nonconventional precursor synthesis methods, such as the “urea–glass” sol–gel or liquid ammonia method. We demonstrate the synthesis and morphology control within the V–Ga–C–N system by preparing the MAX phase carbide and nitride─the latter in the form of bulkier and more defined smaller particle structures─as well as a hitherto unknown carbonitride V₂GaC₁-ₓNₓ MAX phase. This shows the versatility of hybrid methods starting, for example, from wet chemically obtained precursors that already contain all of the ingredients needed for carbonitride formation. All products are characterized in detail by X-ray powder diffraction, electron microscopy, and electron and X-ray photoelectron spectroscopies to confirm their structure and morphology and to detect subtle differences between the different chemical compositions.

Type: Article
Title: From MAX Phase Carbides to Nitrides: Synthesis of V₂GaC, V₂GaN, and the Carbonitride V₂GaC₁-ₓNₓ
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.inorgchem.2c00200
Publisher version: https://doi.org/10.1021/acs.inorgchem.2c00200
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Granular materials, Inorganic carbon compounds, Nitrides Precursors X-rays
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10153692
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