A novel (La0.2Sm0.2Eu0.2Gd0.2Tm0.2)2Zr2O7 high-entropy ceramic nanofiber with excellent thermal stability

Zhao, Weijun; Yang, Fan; Liu, Zhaoli; Chen, Heng; Shao, Zhiheng; Zhang, Xuesong; Wang, Kaixian; Xue, Liyan

doi:10.1016/j.ceramint.2021.07.105

Cited by 48 publications

(20 citation statements)

References 51 publications

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“…Figure 6B compares the thermal conductivity of typical thermal insulation materials. The porous ceramics prepared from rare‐earth‐zirconate HEC fibers has a low thermal conductivity of 0.22 ± 0.05 W m −1 K −1 , which is closed to the reported porous ceramics prepared from (La 0.2 Sm 0.2 Eu 0.2 Gd 0.2 Tm 0.2 ) 2 Zr 2 O 7 HEC nanofibers (0.23 W m −1 K −1 ), 26 lower than that from lanthanum zirconate fibers with similar structure (0.38–0.47 W m −1 K −1 , porosity 43.4%) and some other typical insulation materials like YSZ (0.29–0.41 W m −1 K −1 , porosity 37.7%) 38–42 . The low thermal conductivity of fiber‐based porous HECs is mainly attributed to the low intrinsic thermal conductivity of HEC fibers and high porosity containing air.…”

Section: Resultscontrasting

confidence: 56%

“…Xing et al 25 prepared high-entropy (Y 0.2 Yb 0.2 Sm 0.2 Eu 0.2 Er 0.2 ) 2 O 3 nanofibers with an average crystallize size of 10 nm, which can be explained by the slow diffusion effect. Zhao et al 26 synthesized (La 0.2 Sm 0.2 Eu 0.2 Gd 0.2 Tm 0.2 ) 2 Zr 2 O 7 highentropy nanofibers. The diameter of high-entropy fibers increases by only 2 nm from 1 h to 2.5 h, which is much lower than that of lanthanum zirconate fibers due to the slow diffusion effect.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al. 26 synthesized (La 0.2 Sm 0.2 Eu 0.2 Gd 0.2 Tm 0.2 ) 2 Zr 2 O 7 high‐entropy nanofibers. The diameter of high‐entropy fibers increases by only 2 nm from 1 h to 2.5 h, which is much lower than that of lanthanum zirconate fibers due to the slow diffusion effect.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of ultra‐fine rare‐earth‐zirconate high‐entropy ceramic fibers via electrospinning

Wei

Yang

et al. 2022

J Am Ceram Soc.

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Ceramic fibers have the advantages of low density, high strength, high temperature resistance, and excellent mechanical vibration resistance. In this work, sol-gel and electrospinning were used to prepare ultra-fine rareearth-zirconate high-entropy ceramic (HEC) fibers with the composition of ((La 0.25 Nd 0.25 Sm 0.25 Gd 0.25 ) 0.75 Yb 0.25 ) 2 Zr 2 O 7 . The decomposition process and microscopic morphology of the fibers were characterized by thermogravimetry/differential scanning calorimetry, Fourier transform infrared and scanning electron microscope. The results indicated that defective fluorite-structured fibers with a smooth surface were obtained by calcining at 900-1000 • C, while fibers with the pyrochlore structure and the diameter within 140 nm were obtained by calcining at temperature higher than 1100 • C. The HEC fibers still maintain a continuous microstructure on the surface after calcination. In addition, the porous ceramics prepared from HEC fibers have a comparatively low thermal conductivity (0.22 ± 0.05 W m −1 K −1 , 25 • C). These promising properties indicate that the HEC fibers could be candidate materials for thermal-insulation application.

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Section: Resultscontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Synthesis of ultra‐fine rare‐earth‐zirconate high‐entropy ceramic fibers via electrospinning

Wei

Yang

et al. 2022

J Am Ceram Soc.

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“…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%

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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“…Ceramic nanofibers are an brilliant reinforcement material [25] due to their exceptional mechanical and electrochemical properties, such as high strength and elastic modulus, as well as good chemical and thermal stability [26]. TiO 2 ceramic nanofiber reinforcement, in combination with an Al metal matrix, effectively improves the mechanical properties of the nanocomposite [6].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Inductively Sintered Al/TiO2 Nanocomposites Reinforced by Electrospun Ceramic Nanofibers

et al. 2021

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This study is focuses on the investigation of the effect of using TiO2 short nanofibers as a reinforcement of an Al matrix on the corrosion characteristics of the produced nanocomposites. The TiO2 ceramic nanofibers used were synthesized via electrospinning by sol-gel process, then calcinated at a high temperature to evaporate the residual polymers. The fabricated nanocomposites contain 0, 1, 3 and 5 wt.% of synthesized ceramic nanofibers (TiO2). Powder mixtures were mixed for 1 h via high-energy ball milling in a vacuum atmosphere before being inductively sintered through a high-frequency induction furnace at 560 °C for 6 min. The microstructure of the fabricated samples was studied by optical microscope and field emission scanning electron microscope (FESEM) before and after corrosion studies. Corrosion behavior of the sintered samples was evaluated by both electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques (PPT) in 3.5% NaCl solution for one hour and 24-h immersion times. The results show that even though the percentage of ceramic nanofibers added negatively control corrosion resistance, it is still possible to increase resistance against corrosion for the fabricated nanocomposite by more than 75% in the longer exposure time periods.

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A novel (La0.2Sm0.2Eu0.2Gd0.2Tm0.2)2Zr2O7 high-entropy ceramic nanofiber with excellent thermal stability

Cited by 48 publications

References 51 publications

Synthesis of ultra‐fine rare‐earth‐zirconate high‐entropy ceramic fibers via electrospinning

Synthesis of ultra‐fine rare‐earth‐zirconate high‐entropy ceramic fibers via electrospinning

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

Electrochemical Behavior of Inductively Sintered Al/TiO2 Nanocomposites Reinforced by Electrospun Ceramic Nanofibers

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