Vacancy ordering in zirconium carbide with different carbon contents

Yue Zhou; Jeremy Watts; Cheng Li; William G. Fahrenholtz; Gregory E. Hilmas

doi:10.1016/j.jeurceramsoc.2023.05.044

Vacancy ordering in zirconium carbide with different carbon contents

Yue Zhou, Jeremy Watts, Cheng Li, William G. Fahrenholtz, Gregory E. Hilmas

Powder Diffraction

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Abstract

Zirconium carbide (ZrC_x) ceramics with different carbon contents were prepared by reactive hot-pressing. The rock-salt structure of ZrC_x was the only phase detected by x-ray diffraction of the hot pressed ceramics. The relative densities of ZrC_x decreased as carbon content increased, in general. The actual carbon contents were measured by completely oxidizing the ZrC_x ceramics to ZrO₂. For most compositions, the actual carbon contents were higher than nominal batched compositions, presumably due to carbon uptake from the graphite furnace and hot press dies. Selected area electron diffraction and neutron powder diffraction revealed the presence of carbon vacancy ordering in ZrC_x for 0.6 < x < 0.75. Rietveld refinement of the neutron diffraction patterns determined that the crystal structure of the ordered phase was hexagonal, and the carbon site occupancies were higher than nominal batched carbon stoichiometry.

Original language	English
Pages (from-to)	5814-5821
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	43
Issue number	14
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2023.05.044
State	Published - Nov 2023

Funding

The present research was supported by US National Science Foundation Ceramics Program ( DMR 174284 ). A portion of this research used resources at the Spallation Neutron Source, as appropriate, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory . The present research was supported by US National Science Foundation Ceramics Program (DMR 174284). A portion of this research used resources at the Spallation Neutron Source, as appropriate, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Keywords

Densification
Ordered phase
Stoichiometry
Zirconium carbide

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10.1016/j.jeurceramsoc.2023.05.044

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title = "Vacancy ordering in zirconium carbide with different carbon contents",

abstract = "Zirconium carbide (ZrCx) ceramics with different carbon contents were prepared by reactive hot-pressing. The rock-salt structure of ZrCx was the only phase detected by x-ray diffraction of the hot pressed ceramics. The relative densities of ZrCx decreased as carbon content increased, in general. The actual carbon contents were measured by completely oxidizing the ZrCx ceramics to ZrO2. For most compositions, the actual carbon contents were higher than nominal batched compositions, presumably due to carbon uptake from the graphite furnace and hot press dies. Selected area electron diffraction and neutron powder diffraction revealed the presence of carbon vacancy ordering in ZrCx for 0.6 < x < 0.75. Rietveld refinement of the neutron diffraction patterns determined that the crystal structure of the ordered phase was hexagonal, and the carbon site occupancies were higher than nominal batched carbon stoichiometry.",

keywords = "Densification, Ordered phase, Stoichiometry, Zirconium carbide",

author = "Yue Zhou and Jeremy Watts and Cheng Li and Fahrenholtz, {William G.} and Hilmas, {Gregory E.}",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = nov,

doi = "10.1016/j.jeurceramsoc.2023.05.044",

language = "English",

volume = "43",

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T1 - Vacancy ordering in zirconium carbide with different carbon contents

AU - Zhou, Yue

AU - Watts, Jeremy

AU - Li, Cheng

AU - Fahrenholtz, William G.

AU - Hilmas, Gregory E.

PY - 2023/11

Y1 - 2023/11

N2 - Zirconium carbide (ZrCx) ceramics with different carbon contents were prepared by reactive hot-pressing. The rock-salt structure of ZrCx was the only phase detected by x-ray diffraction of the hot pressed ceramics. The relative densities of ZrCx decreased as carbon content increased, in general. The actual carbon contents were measured by completely oxidizing the ZrCx ceramics to ZrO2. For most compositions, the actual carbon contents were higher than nominal batched compositions, presumably due to carbon uptake from the graphite furnace and hot press dies. Selected area electron diffraction and neutron powder diffraction revealed the presence of carbon vacancy ordering in ZrCx for 0.6 < x < 0.75. Rietveld refinement of the neutron diffraction patterns determined that the crystal structure of the ordered phase was hexagonal, and the carbon site occupancies were higher than nominal batched carbon stoichiometry.

AB - Zirconium carbide (ZrCx) ceramics with different carbon contents were prepared by reactive hot-pressing. The rock-salt structure of ZrCx was the only phase detected by x-ray diffraction of the hot pressed ceramics. The relative densities of ZrCx decreased as carbon content increased, in general. The actual carbon contents were measured by completely oxidizing the ZrCx ceramics to ZrO2. For most compositions, the actual carbon contents were higher than nominal batched compositions, presumably due to carbon uptake from the graphite furnace and hot press dies. Selected area electron diffraction and neutron powder diffraction revealed the presence of carbon vacancy ordering in ZrCx for 0.6 < x < 0.75. Rietveld refinement of the neutron diffraction patterns determined that the crystal structure of the ordered phase was hexagonal, and the carbon site occupancies were higher than nominal batched carbon stoichiometry.

KW - Densification

KW - Ordered phase

KW - Stoichiometry

KW - Zirconium carbide

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DO - 10.1016/j.jeurceramsoc.2023.05.044

M3 - Article

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SN - 0955-2219

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JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 14

ER -

Vacancy ordering in zirconium carbide with different carbon contents

Abstract

Funding

Keywords

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