Thermodynamics of high entropy oxides

McCormack, Scott J.; Navrotsky, Alexandra

doi:10.1016/j.actamat.2020.10.043

Cited by 159 publications

(115 citation statements)

References 179 publications

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“…As resulting from our DFT calculations, such a high level of local cationic intermixing within the LSM phase (high configurational entropy) is key for the oustanding thermal stability of the VAN structure. 57 Because the VAN structure is self-assembled, both the composition and interfaces which form at the growth temperature are the stable ones, i.e. they should not change with further annealing under conditions similar to the growth conditions as they are the energetically preferred.…”

Section: ∝mentioning

confidence: 99%

A heavily subtituted manganite in an ordered nanocomposite for long-term energy applications

Baiutti

Chiabrera

Acosta

et al. 2021

Preprint

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The implementation of nano-engineered composite oxides opens up the way towards the development of a novel class of superior energy materials. Vertically aligned nanocomposites are characterized by a coherent, dense array of vertical interfaces, which allows for the extension of local effects to the whole volume of the material. Here, we use such a unique architecture to fabricate highly electrochemically active nanocomposites of lanthanum strontium manganite and doped ceria with unprecedented stability and straight applicability as functional layers in solid state energy devices. Direct evidence of synergistic local effects for enhancing the electrochemical performance, stemming from the highly ordered phase alternation, is given here for the first time using atom-probe tomography combined with oxygen isotopic exchange. Interface-induced cationic substitution, enabling lattice stabilization, is presented as the origin of the observed long-term stability. These findings reveal a novel route for materials nano-engineering based on the coexistence between local disorder and long-range arrangement.

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Section: ∝mentioning

confidence: 99%

A heavily subtituted manganite in an ordered nanocomposite for long-term energy applications

Baiutti

Chiabrera

Acosta

et al. 2021

Preprint

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“…The key aspects of HEOs, such as the high entropy based nomenclature, the role of entropy in phase stabilization and related thermodynamic parameters, synthesis routes, structural and some of the functional features, have already been highlighted in the few review articles available on HEOs. 2,4,6,7,[52][53][54][55] In contrast, the focus of this brief Frontier article is the magnetic properties of HEOs that has recently started to receive an increasing attention. The fundamentals of magnetism in metal oxides that are of relevance for the understanding of magnetism in HEOs are briefly discussed to be followed by specific case studies on three important magnetic subclasses of HEOs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of high entropy oxides

2021

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“…Metal oxides play a very important role in today's technological advancements such as energy harvesting and production, photo-catalysis, high-temperature contact materials, and environmental pollution preventions supported by nanotechnology [14][15][16][17][18]. High entropy oxides (HEOs) are established from these metal oxides and are entropy-stabilized solid-solutions where nearly equimolar multi-components of the oxides are brought into a singlephase material [19][20][21][22] through thermodynamic stabilizations [23]. Single-phase HEOs contain five or more cations where x i and x j represent the mole fraction of elements present in the cation and anion sites respectively, and R is the universal gas constant (R = 8.314 J/mole K) [20,25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterizations of (Mg, Co, Ni, Cu, Zn)O high-entropy oxides

et al. 2021

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High-temperature structural ceramic materials require stability in terms of thermal and mechanical properties. High entropy oxides (HEOs) are among the emerging novel family of advanced ceramic materials with peculiar functional properties. However, their thermal stabilities and mechanical properties are not well investigated. In this work, HEO systems were synthesized from binary oxides of MgO, CoO, NiO, CuO, and ZnO using solid-state reaction method at high temperature, after obtaining the individual oxides through co-precipitation methods. The phase purity of as-synthesized and sintered samples was characterized using X-ray powder diffraction, while the microstructural investigation was performed using Scanning electron microscopy. Mechanical property of the sintered samples at different sintering times and temperatures was investigated and the sample sintered at a sintering temperature of 1200 °C for 15 h sintering time showed a maximum Vickers hardness of about 16 GPa. This result is comparable with some of the hard ceramic materials, and therefore the materials could be a potential candidate for structural applications.

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Thermodynamics of high entropy oxides

Cited by 159 publications

References 179 publications

A heavily subtituted manganite in an ordered nanocomposite for long-term energy applications

A heavily subtituted manganite in an ordered nanocomposite for long-term energy applications

Magnetic properties of high entropy oxides

Synthesis and characterizations of (Mg, Co, Ni, Cu, Zn)O high-entropy oxides

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