High‐entropy La(Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)O3 ceramic exhibiting high emissivity and low thermal conductivity

Wang, Qu; Zhang, Qi; Wang, Gang; Zhang, Yifan; Miao, Xiangshui

doi:10.1111/ijac.14183

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Zhou et al synthesized (La 0.2 Nd 0.2 Gd 0.2 Sm 0.2 Pr 0.2 )MgAl 11 O 9 and found that it had a much higher infrared emissivity than LaMgAl 11 O 9 [34]. Wang et al synthesized La(Fe 0.2 Co 0.2 Ni 0.2 Cr 0.2 Mn 0.2 )O 3 ceramics, which exhibited an emissivity of up to 92% in the range from 0.76 to 2.50 µm [35]. Song et al designed and synthesized high-entropy transition metal disilicides and the higher infrared emissivity was due to the increase in phonon scattering caused by lattice distortion; this reduced the thermal and electrical conductivity of the lattice and ultimately increased its infrared emissivity [36].…”

Section: Introductionmentioning

confidence: 99%

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Wang,

Pan,

Zhang

et al. 2024

Materials

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The development of a new generation of solid particle solar receivers (SPSRs) with high solar absorptivity (0.28–2.5 μm) and high infrared emissivity (1–22 μm) is crucial and has attracted much attention for the attainment of the goals of “peak carbon” and “carbon neutrality”. To achieve the modulation of infrared emission and solar absorptivity, two types of medium- and high-entropy rare-earth hexaboride (ME/HEREB6) ceramics, (La0.25Sm0.25Ce0.25Eu0.25)B6 (MEREB6) and (La0.2Sm0.2Ce0.2Eu0.2Ba0.2)B6 (HEREB6), with severe lattice distortions were synthesized using a high-temperature solid-phase method. Compared to single-phase lanthanum hexaboride (LaB6), HEREB6 ceramics show an increase in solar absorptivity from 54.06% to 87.75% in the range of 0.28–2.5 μm and an increase in infrared emissivity from 76.19% to 89.96% in the 1–22 μm wavelength range. On the one hand, decreasing the free electron concentration and the plasma frequency reduces the reflection and ultimately increases the solar absorptivity. On the other hand, the lattice distortion induces changes in the B–B bond length, leading to significant changes in the Raman scattering spectrum, which affects the damping constant and ultimately increases the infrared emissivity. In conclusion, the multicomponent design can effectively improve the solar energy absorption and heat transfer capacity of ME/HEREB6, thus providing a new avenue for the development of solid particles.

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Section: Introductionmentioning

confidence: 99%

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Wang,

Pan,

Zhang

et al. 2024

Materials

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“…In 2015, Rost et al were the first to synthesize entropy-stabilized oxides (MgCoNiCuZn)O with a rock salt structure, extending high-entropy materials from alloys to oxides [ 4 ]. At present, a large number of high-entropy oxides (HEOs) with different structures were synthesized, including a fluorite [ 5 , 6 , 7 , 8 ], pyrochlore [ 9 , 10 , 11 , 12 ], spinel [ 13 , 14 , 15 , 16 ], and perovskite structure [ 17 , 18 , 19 , 20 , 21 ], and so on [ 22 , 23 ]. Nevertheless, many researchers have committed to exploring new possibilities of entropy-stabilized HEO systems.…”

Section: Introductionmentioning

confidence: 99%

The Formation and Phase Stability of A-Site High-Entropy Perovskite Oxides

et al. 2023

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High entropy perovskite oxides (HEPOs) were a class of advanced ceramic materials, which had attracted much scientific attention in recent years. However, the effect of factors affecting the phase stability of high entropy perovskite oxides was still controversial. Herein, 17 kinds of A-site HEPOs were synthesized by solid-state methods, and several criteria for the formation of HEPOs and phase stability were investigated. Single-phase solid solutions were synthesized in 12 kinds of subsystems. The results show that the phase stability of a single-phase solid solution was affected by the size disorder and configurational entropy. The electronegativity difference was the key parameter to predict the evolution of the cubic/tetragonal phase, rather than the tolerance factor. Cubic HEPOs were easily formed when the electronegativity difference was <0.4, while the tetragonal HEPOs were easily formed when the electronegativity difference was ≥0.4. This study can further broaden the family of HEPOs and is expected to design the phase stability of HEPOs through electronegativity difference.

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Novel (La0.2Eu0.2Nd0.2Sm0.2Pr0.2)(Al0.6Co0.4)O3-δ and (La0.2Eu0.2Nd0.2Sm0.2Ca0.2)(Al0.6Co0.4)O3-δ high-entropy ceramics with high emissivity and low degradation

Ma,

Wang,

et al. 2024

Ceramics International

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High‐entropy La(Fe_0.2Co_0.2Ni_0.2Cr_0.2Mn_0.2)O₃ ceramic exhibiting high emissivity and low thermal conductivity

Cited by 4 publications

References 17 publications

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

The Formation and Phase Stability of A-Site High-Entropy Perovskite Oxides

Novel (La0.2Eu0.2Nd0.2Sm0.2Pr0.2)(Al0.6Co0.4)O3-δ and (La0.2Eu0.2Nd0.2Sm0.2Ca0.2)(Al0.6Co0.4)O3-δ high-entropy ceramics with high emissivity and low degradation

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