On the stoichiometry of zirconium carbide

Gasparrini, Claudia and Rana, Dhan-sham and Le Brun, Niccolò and Horlait, Denis and Markides, Christos N. and Farnan, Ian and Lee, William E. (2020) On the stoichiometry of zirconium carbide. Scientific Reports, 10 (1). ISSN 2045-2322 DOI https://doi.org/10.1038/s41598-020-63037-0

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Official URL: https://doi.org/10.1038/s41598-020-63037-0


The dependencies of the enhanced thermomechanical properties of zirconium carbide (ZrCx) with sample purity and stoichiometry are still not understood due to discrepancies in the literature. Multiple researchers have recently reported a linear relation between the carbon to zirconium atomic ratio (C/Zr) and the lattice parameter, in contrast with a more established relationship that suggests that the lattice parameter value attains a maximum value at a C/Zr ~ 0.83. In this study, the relationship between C/Zr atomic ratio and the lattice parameter is critically assessed: it is found that recent studies reporting the thermophysical properties of ZrCx have unintentionally produced and characterised samples containing zirconium oxycarbide. To avoid such erroneous characterization of ZrCx thermophysical properties in the future, we propose a method for the accurate measurement of the stoichiometry of ZrCx using three independent experimental techniques, namely: elemental analysis, thermogravimetric analysis and nuclear magnetic resonance spectroscopy. Although a large scatter in the results (ΔC/Zr = 0.07) from these different techniques was found when used independently, when combining the techniques together consistent values of x in ZrCx were obtained.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 10
Identification Number: https://doi.org/10.1038/s41598-020-63037-0
Depositing User: Sarah Humbert
Date Deposited: 25 Jun 2020 01:16
Last Modified: 25 Jun 2020 01:16
URI: http://eprints.esc.cam.ac.uk/id/eprint/4767

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