Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE=La, Nd, Gd, Sm, Pr, Dy; M=Mg, Fe, Co, Ni, Zn)

Zhu, Haolin; Liu, Ling; Xiang, Huimin; Dai, Fu‐Zhi; Wang, Xiaohui; Ma, Zhuang; Liu, Yanbo; Zhou, Yanchun

doi:10.1016/j.jmst.2021.06.068

Cited by 33 publications

(16 citation statements)

References 75 publications

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“…This is attributed to the configurational entropy (Δ S config ) and Gibbs free energy (Δ G mix ), which are the key factors of thermal stability. According to the Gibbs free energy equation: On the basis of higher configurational entropy, T Δ S increases more than the mixing enthalpy (Δ H mix ) at higher temperatures so that the reduction of Δ G mix at higher temperatures makes the system more thermally stable …”

Section: Results and Discussionmentioning

confidence: 99%

“…On the basis of higher configurational entropy, TΔS increases more than the mixing enthalpy (ΔH mix ) at higher temperatures so that the reduction of ΔG mix at higher temperatures makes the system more thermally stable. 28 3.3. Microstructure and Infrared Radiation Performance Analysis of the HEO Coating.…”

Section: Infrared Radiation Performance and Thermal Stability Test Of...mentioning

confidence: 99%

“…21 Conventional spinel oxides are widely used in photocatalysis, 22,23 solar absorption, 24,25 and infrared radiation materials 26,27 the effects of configurational entropy (ΔS config ) and temperature (T) on the Gibbs free energy are dominant at high temperatures. 28 Thus, spinel-type high-entropy oxides with higher configurational entropy can result in smaller Gibbs free energy and better thermal stability compared to conventional spinel oxides. Admittedly, HEO with a spinel structure is widely used in a large number of applications, attributed to their outstanding electrochemical performances, adjustable magnetic properties, and excellent catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

“…Correspondingly, spinel-type high-entropy oxides with the same crystal structure should have similar physical and chemical properties. In addition, the Gibbs free energy equation (Δ G mix = Δ H mix – T Δ S config ) shows that the effects of configurational entropy (Δ S config ) and temperature ( T ) on the Gibbs free energy are dominant at high temperatures . Thus, spinel-type high-entropy oxides with higher configurational entropy can result in smaller Gibbs free energy and better thermal stability compared to conventional spinel oxides.…”

Section: Introductionmentioning

confidence: 99%

“…Research shows that oxygen vacancies are beneficial to electromagnetic wave absorption and radiation. − A spinel-structure HEO (Cu, Mn, Fe, Cr) 3 O 4 with a large number of oxygen vacancies is synthesized by selecting transition metal elements in this work. Second, the entropy-driven stable structure and disordered distribution of metal elements are expected to exhibit high thermal stability at high temperatures, , which makes this HEO a very attractive candidate for infrared radiation materials. To expand the application fields of this spinel-structure HEO, we investigate its infrared radiation performance.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Entropy-Assisted High-Entropy Oxide with a Spinel Structure toward High-Temperature Infrared Radiation Materials

Guo

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Developing advanced materials with a high-entropy concept is one of the hot trends in materials science. The configurational entropy of high-entropy materials can be tuned by introducing different atomic species, which can also impart a result in excellent physical and chemical properties. In this work, we synthesized a solid-solution oxide (Cu, Mn, Fe, Cr) 3 O 4 by a simple and scalable solid-phase synthesis method. We extensively investigated the microstructure and chemical composition, indicating that (Cu, Mn, Fe, Cr) 3 O 4 has a single-phase spinel structure. Simultaneously, we reasonably evaluated the position occupied by the elements of (Cu, Mn, Fe, Cr) 3 O 4 in a spinel structure as (Cu 0.75 Fe 0.25 )(Fe 0.25 Cr 0.375 Mn 0.375 ) 2 O 4 . Here, we first evaluated the infrared radiation performance of (Cu, Mn, Fe, Cr) 3 O 4 . The new, high-entropy oxide (HEO) (Cu, Mn, Fe, Cr) 3 O 4 powder exhibits high infrared emissivity values of 0.879 and 0.848 in the wavelengths of 0.78−2.5 and 2.5−16 μm, respectively, and has excellent thermal stability. More importantly, the infrared emissivity values of as-prepared HEO coating reach 0.955 (0.78−2.5 μm) at room temperature and 0.936 (3−16 μm) at 800 °C. This work provides a viable strategy toward the laboratory mass production of this HEO for infrared radiation materials, which shows great potential in the energy-related applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Infrared Radiation Performance and Thermal Stability Test Of...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Entropy-Assisted High-Entropy Oxide with a Spinel Structure toward High-Temperature Infrared Radiation Materials

Guo

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Synthesis and Processing of High‐Entropy Materials

2023

High‐Entropy Materials

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High‐Entropy Engineering for Broadband Infrared Radiation

Wang

Liu

et al. 2023

Adv Funct Materials

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Developing high‐performance infrared (IR) radiation materials with desired broadband emissivity, excellent thermal stability, and scalable fabrication processes is highly desirable for energy‐saving applications and heat dissipation. However, it remains a grand challenge to concurrently meet these requirements in existing IR radiation materials. Herein, a high‐entropy (HE) approach is employed to advance the IR radiation performance of spinel oxide. This strategy efficiently narrows the bandgap due to the enhanced electron transitions and the introduction of oxygen vacancies (Ov), variable‐valence behavior, and orbital hybridization. In addition, the lattice distortion effect lowers the symmetry of lattice vibration. Therefore, the resulting HE spinel oxide exhibits near‐blackbody radiation performance, with its emissivity approximately three times higher than that of the binary spinel oxide. Moreover, the entropy‐dominating phase stabilization effect contributes to impressive thermal stability (stable at 1300 °C for 100 h). This makes it suitable for high‐temperature thermal radiation applications, such as energy conservation in industrial high‐temperature furnaces. More importantly, the HE spinel oxide can be readily spray‐coated on various substrates. And the coating on stainless steel reaches an outstanding emissivity of 0.943 in the 0.78−16 µm wavelength range. All these merits render the HE approach competitive for the development of high‐emissivity and thermally stable thermal radiation materials.

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Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE=La, Nd, Gd, Sm, Pr, Dy; M=Mg, Fe, Co, Ni, Zn)

Cited by 33 publications

References 75 publications

Entropy-Assisted High-Entropy Oxide with a Spinel Structure toward High-Temperature Infrared Radiation Materials

Entropy-Assisted High-Entropy Oxide with a Spinel Structure toward High-Temperature Infrared Radiation Materials

Synthesis and Processing of High‐Entropy Materials

High‐Entropy Engineering for Broadband Infrared Radiation

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