High Entropy Oxide Relaxor Ferroelectrics

Sharma, Yogesh; Lee, Min-Cheol; Pitike, Krishna Chaitanya; Mishra, K. K.; Zheng, Qiang; Gao, Xiang; Musicó, Brianna L.; Mazza, Alessandro R.; Katiyar, Ram S.; Keppens, Veerle; Brahlek, Matthew; Yarotski, Dmitry; Prasankumar, R. P.; Chen, Aiping; Cooper, Valentino R.; Ward, Thomas Z.

doi:10.1021/acsami.2c00340

Cited by 33 publications

(20 citation statements)

References 76 publications

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“…The first studies in this area are already showing promising results with thin films of the perovskite Ba(Ti,Sn,Zr,Hf,Nb)O 3 exhibiting relaxor behavior in its dielectric properties. Transmission electron microscopy has shown that the cation distortion in this material occurs collectively over a few unit cells in polar nanodomains, suggesting that not just Ti but the other d 0 elements are also participating in the behavior Point defects including vacancies : Given the profound level of configurational disorder in HEOs, more conventional forms of disorder in these materials have remained relatively unexplored.…”

Section: Entropy Enhancements Due To the Local Environmentmentioning

confidence: 99%

Understanding the Role of Entropy in High Entropy Oxides

et al. 2023

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The field of high entropy oxides (HEOs) flips traditional materials science paradigms on their head by seeking to understand what properties arise in the presence of profound configurational disorder. This disorder, which originates from multiple elements sharing a single lattice site, can take on a kaleidoscopic character due to the vast numbers of possible elemental combinations. High configurational disorder appears to imbue some HEOs with functional properties that far surpass their nondisordered analogs. While experimental discoveries abound, efforts to characterize the true magnitude of the configurational entropy and understand its role in stabilizing new phases and generating superior functional properties have lagged behind. Understanding the role of configurational disorder in existing HEOs is the crucial link to unlocking the rational design of new HEOs with targeted properties. In this Perspective, we attempt to establish a framework for articulating and beginning to address these questions in pursuit of a deeper understanding of the true role of entropy in HEOs.

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Section: Entropy Enhancements Due To the Local Environmentmentioning

confidence: 99%

Understanding the Role of Entropy in High Entropy Oxides

et al. 2023

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Section: Entropy Enhancements Due To the Local Environmentmentioning

confidence: 92%

Understanding the role of entropy in high entropy oxides

Aamlid¹,

Oudah²,

Rottler³

et al. 2023

Preprint

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The field of high entropy oxides (HEOs) flips traditional materials science paradigms on their head by seeking to understand what properties arise in the presence of profound configurational disorder. This disorder, which originates from multiple elements sharing a single lattice site, can take on a kaleidoscopic character due to the vast numbers of possible elemental combinations. High configurational disorder appears to imbue some HEOs with functional properties that far surpass their non-disordered analogs. While experimental discoveries abound, efforts to characterize the true magnitude of the configurational entropy and understand its role in stabilizing new phases and generating superior functional properties have lagged behind. Understanding the role of configurational disorder in existing HEOs is the crucial link to unlocking the rational design of new HEOs with targeted properties. In this Perspective, we attempt to establish a framework for articulating and beginning to address these questions in pursuit of a deeper understanding of the true role of entropy in HEOs.

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“…Interest in perovskite HEOs escalated. HEO perovskites showed indications of relaxor ferroelectricity 84–87 . Son et al.…”

Section: Historical Perspectivementioning

confidence: 99%

High‐entropy oxides: Harnessing crystalline disorder for emergent functionality

et al. 2023

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High-entropy materials defy historical materials design paradigms by leveraging chemical disorder to kinetically stabilize novel crystalline solid solutions comprised of many end-members. Formulational diversity results in local crystal structures that are seldom found in conventional materials and can strongly influence macroscopic physical properties. Thermodynamically prescribed chemical flexibility provides a means to tune such properties. Additionally, kinetic metastability results in many possible atomic arrangements, including both solid-solution configurations and heterogeneous phase assemblies, depending on synthesis conditions. Local disorder induced by metastability, and extensive cation solubilities allowed by thermodynamics combine to give many high-entropy oxide systems utility as electrochemical, magnetic, thermal, dielectric, and optical materials. Though high-entropy materials research is maturing rapidly, much remains to be understood and many compositions still await discovery, exploration, and implementation.

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High Entropy Oxide Relaxor Ferroelectrics

Cited by 33 publications

References 76 publications

Understanding the Role of Entropy in High Entropy Oxides

Understanding the Role of Entropy in High Entropy Oxides

Understanding the role of entropy in high entropy oxides

High‐entropy oxides: Harnessing crystalline disorder for emergent functionality

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