High-entropy spinel oxides: Self-propagating synthesis and densification by spark plasma sintering

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00618519" target="_blank" >RIV/68081723:_____/25:00618519 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0955221925001736?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0955221925001736?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2025.117353" target="_blank" >10.1016/j.jeurceramsoc.2025.117353</a>

Result language
angličtina
Original language name
High-entropy spinel oxides: Self-propagating synthesis and densification by spark plasma sintering
Original language description
The self-propagating room temperature method was utilized to synthesize high-entropy spinel oxides (HESOs): (Co,Cr,Fe,Mn,Ni)3O4-delta, (Mg,Cr,Fe,Mn,Ni)3O4-delta, (Mg,Co,Fe,Cr,Mn)3O4-delta, (Mn,Zn,Fe,Ni,Cr)3O4-delta, and (Co,Mn,Zn, Fe,Cr)3O4-delta. After thermal treatment at 1000 degrees C, XRD analysis confirmed their single-phased spinel (Fd3m) structure. Densification by spark plasma sintering was successfully used for the first time on HESOs, resulting in relative densities from 94 % to 99 % while retaining the spinel structure. SEM/EDS mapping displayed a homogenous, dense microstructure with minimal porosity. (Mn,Zn,Fe,Ni,Cr)3O4-delta displayed the highest bending strength (171.5 MPa) and Young's modulus (188 GPa). (Mg,Co,Fe,Cr,Mn)3O4-delta demonstrated the highest hardness (8.8 GPa), while (Mg,Cr,Fe,Mn,Ni)3O4-delta exhibited the highest indentation fracture toughness (1.5 MPa m-1/ 2). The lowest thermal diffusivity (0.67 0.51 mm2 s-1) was recorded for (Co,Mn,Zn,Fe,Cr)3O4-delta, while (Co,Cr,Fe, Mn,Ni)3O4-delta, had the highest thermal diffusivity (0.82 0.58 mm2 s-1). The study demonstrated a simple and efficacious method of synthesizing and densifying HESOs with structural, mechanical, and thermal properties favourable for different applications.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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