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High-entropy fluorite oxides
Open accessAbstract
Abstract Eleven fluorite oxides with five principal cations (in addition to a four-principal-cation (Hf0.25Zr0.25Ce0.25Y0.25)O2-δ as a start point and baseline) were fabricated via high-energy ball milling, spark plasma sintering, and annealing in air. Eight of the compositions, namely (Hf0.25Zr0.25Ce0.25Y0.25)O2-δ, (Hf0.25Zr0.25Ce0.25)(Y0.125Yb0.125)O2-δ, (Hf0.2Zr0.2Ce0.2)(Y0.2Yb0.2)O2-δ, (Hf0.25Zr0.25Ce0.25)(Y0.125Ca0.125)O2-δ, (Hf0.25Zr0.25Ce0.25)(Y0.125Gd0.125)O2-δ, (Hf0.2Zr0.2Ce0.2)(Y0.2Gd0.2)O2-δ, (Hf0.25Zr0.25Ce0.25)(Yb0.125Gd0.125)O2-δ, and (Hf0.2Zr0.2Ce0.2)(Yb0.2Gd0.2)O2-δ, possess single-phase solid solutions of the fluorite crystal structure with high configurational entropies (on the cation sublattices), akin to those high-entropy alloys and ceramics reported in prior studies. Most high-entropy fluorite oxides (HEFOs), except for the two containing both Yb and Gd, can be sintered to high relative densities. These single-phase HEFOs exhibit lower electrical conductivities and comparable hardness (even with higher contents of softer components such as Y2O3 and Yb2O3), in comparison with 8 mol. % Y2O3-stabilized ZrO2 (8YSZ). Notably, these single-phase HEFOs possess lower thermal conductivities than that of 8YSZ, presumably due to high phonon scattering by multiple cations and strained lattices.
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Citations
Cites
Analysis of heat flow in layered structures for time-domain thermoreflectance
Cahill, D. G. (2004) · Review of Scientific Instruments · doi:10.1063/1.1819431 · Cited by 1,543
Schmidt, A. J. (2013) · Annual Review of Heat Transfer · doi:10.1615/annualrevheattransfer.v16.60 · Cited by 74
Cited by
Oses, C., Toher, C., & Curtarolo, S. (2020) · Nature Reviews Materials · doi:10.1038/s41578-019-0170-8 · Cited by 2,081
High‐Entropy Oxides: Fundamental Aspects and Electrochemical Properties
Sarkar, A., Wang, Q., Schiele, A., Chellali, M. R., Bhattacharya, S. S., Wang, D., Brezesinski, T., Hahn, H., Velasco, L., & Breitung, B. (2019) · Advanced Materials · doi:10.1002/adma.201806236 · Cited by 1,234
High-entropy energy materials: challenges and new opportunities
Ma, Y., Ma, Y., Wang, Q., Schweidler, S., Botros, M., Fu, T., Hahn, H., Brezesinski, T., & Breitung, B. (2021) · Energy & Environmental Science · doi:10.1039/d1ee00505g · Cited by 963
Review of high entropy ceramics: design, synthesis, structure and properties
Zhang, R.-Z., & Reece, M. J. (2019) · Journal of Materials Chemistry A · doi:10.1039/c9ta05698j · Cited by 760
Recent progress of high-entropy materials for energy storage and conversion
Amiri, A., & Shahbazian-Yassar, R. (2021) · Journal of Materials Chemistry A · doi:10.1039/d0ta09578h · Cited by 592
Metadata
- Authors
- Gild, J., Samiee, M., Braun, J. L., Harrington, T., Vega, H., Hopkins, P. E., Vecchio, K., & Luo, J.
- Venue
- Journal of the European Ceramic Society
- Publisher
- Elsevier BV
- Published
- 2018-08
- Volume
- 38
- Issue
- 10
- Pages
- 3578-3584
- ISSN
- 0955-2219 (ISSN-L)
- OpenAlex
- W2796474669
- Cited by
- 636
- References
- 2
- FWCI
- 17.80
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Gild, J., Samiee, M., Braun, J. L., Harrington, T., Vega, H., Hopkins, P. E., Vecchio, K., & Luo, J. (2018). High-entropy fluorite oxides. Journal of the European Ceramic Society. https://doi.org/10.1016/j.jeurceramsoc.2018.04.010
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