Mechanical property and irradiation resistance of high entropy pyrochlore (Sm0.2Eu0.2Gd0.2Y0.2Lu0.2)2Ti2O7

Wang, Hao; Zhu, Changzu; Wang, Zezhen; Wang, Menghui; Li, Yuhong

doi:10.1016/j.nimb.2022.10.011

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…The A 2 B 2 O 7 formulation for these materials can form in a disordered fluorite structure or a pyrochlore-type, with A 3+ and B 4+ cation sublattices, though it is possible to include off-nominal charged cations into these sites [56]. This family of compositions presents even more possible combinations with entropic disorder in the A-site [50,51,[56][57][58][59][60][61][62], B-site [52,63,64], or both [48,49,56,65,66], allowing for a massive compositional space for tuning of properties of interest. Of these, A-site disordered zirconates have received the most attention, with zirconium, hafnium, or cerium being the single B-site occupant.…”

Section: Barrier Coatingsmentioning

confidence: 99%

“…This work is largely informed by the multitude of potential structures discovered by computation methods [26], as well as early results in HEOs, demonstrating structural tunability beyond the parent compound structures [14]. These early studies, particularly with regards to heavy ion irradiation, show limited benefit of high entropy compositions in resistance to amorphization as compared to ternary pyrochlores [57,99], as illustrated in figure 4, for (Yb 0.2 Tm 0.2 Lu 0.2 Ho 0.2 Er 0.2 ) 2 Ti 2 O 7 [99] and Ho 2 Ti 2 O 7 [100]. However, some high entropy pyrochlores have shown modest improvement of radiation tolerance attributable to the large lattice distortion of the high entropy ceramic [101].…”

Section: Heosmentioning

confidence: 99%

“…Each of these arenas have potential for devices operating in extremes, i.e. carbides at high temperatures [47] and oxides in high pressure, hydrogen rich, and high radiation environments [57,99]. As an example in the HEOs, the functional properties offer a wide diversity of behaviors and include superconductivity [129,133], tunable metal to insulator transitions [33,134], bandgap tunability [135,136], and ferroelectricity [137].…”

Section: Electronic Materialsmentioning

confidence: 99%

“…high energy neutron, γ, etc). While there have been some promising results [57], there is a great deal to be done to understand the radiation tolerance of these complex crystal structures. As example, a spinel structure has a great propensity towards site inversion.…”

Section: Outlook and Research Needsmentioning

confidence: 99%

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High entropy ceramics for applications in extreme environments

Ward,

Wilkerson,

Musicó

et al. 2024

J. Phys. Mater.

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Compositionally complex materials have demonstrated extraordinary promise for structural robustness in extreme environments. Of these, the most commonly thought of are high entropy alloys, where chemical complexity grants uncommon combinations of hardness, ductility, and thermal resilience. In contrast to these metal-metal bonded systems, the addition of ionic and covalent bonding has led to the discovery of high entropy ceramics. These materials also possess outstanding structural, thermal, and chemical robustness but with a far greater variety of functional properties which enable access to continuously controllable magnetic, electronic, and optical phenomena. In this experimentally focused perspective, we outline the potential for high entropy ceramics in functional applications under extreme environments, where intrinsic stability may provide a new path toward inherently hardened device design. Current works on high entropy carbides, actinide bearing ceramics, and high entropy oxides are reviewed in the areas of radiation, high temperature, and corrosion tolerance where the role of local disorder is shown to create pathways toward self-healing and structural robustness. In this context, new strategies for creating future electronic, magnetic, and optical devices to be operated in harsh environments are outlined.

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