4.5 Review

A review on high entropy silicides and silicates: Fundamental aspects, synthesis, properties

Related references

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Article Materials Science, Ceramics

Microstructure and property evolution of high-entropy rare-earth silicate T/EBCs during thermal aging

Dong Fan et al.

Summary: With the increasing service temperature of aeroengines, the development of thermal/environmental barrier coatings (T/EBCs) has been considered to be a great challenge. In this study, high-entropy design was used to change the crystal structure of rare-earth monosilicates used for T/EBCs, and the performance changes before and after thermal aging were investigated. The results showed that the high-entropy coatings after thermal aging exhibited lower thermal conductivity, similar thermal expansion coefficient, and better toughness.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2023)

Article Materials Science, Ceramics

Significantly improved corrosion resistance of high-entropy rare-earth silicate multiphase ceramics against molten CMAS

Yuxuan He et al.

Summary: A novel high-entropy (4RE(0.25))(2)Si2O7/(4RE(0.25))(2)SiO5 (RE = Y, Yb, Er, and Sc) multiphase ceramic was prepared to improve the resistance of rare-earth silicates to molten CMAS at high temperature. The ceramic exhibited a reaction layer thickness of only 55 μm after 48 h of corrosion at 1500 degrees C, indicating its effectiveness in resisting molten CMAS corrosion.

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Article Chemistry, Physical

Ultra-low thermal conductivity and excellent high temperature resistance against calcium-magnesium-alumina-silicate of a novel β-type pyrosilicates

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Summary: A new multicomponent rare earth pyrosilicate (5RE0.2)2Si2O7 has been developed for thermal/environmental barrier coating. It exhibits low thermal conductivity, good match of coefficient of thermal expansion with SiC-based ceramics matrix composites, and excellent resistance against CMAS.

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Article Materials Science, Ceramics

A high-entropy (Yb0.2Y0.2Lu0.2Ho0.2Er0.2)2Si2O7 environmental barrier coating prepared by atmospheric plasma-spray

Zeyu Chen et al.

Summary: In this study, a high-entropy (Yb0.2Y0.2Lu0.2Ho0.2Er0.2)2Si2O7 coating was prepared for the first time using atmospheric plasma-spray. The coating was characterized and assessed for microstructure, composition, and properties. The high-entropy coating exhibited a phase structure similar to the powder and uniform distribution of rare earth elements without elemental segregation. It also showed excellent phase stability at high temperatures and a thermal expansion coefficient comparable to ceramic matrix composites. Therefore, this high-entropy coating has great potential to be used as an environmental barrier coating, and atmospheric plasma-spray is a suitable method for its preparation.

CERAMICS INTERNATIONAL (2023)

Article Materials Science, Ceramics

Investigation on behavior and mechanism of enhanced water vapor corrosion resistance for (Lu0.25Yb0.25Er0.25Y0.25)2SiO5 environmental barrier coating

Dong Fan et al.

Summary: Rare-earth monosilicate (RE2SiO5) is a promising material for environmental barrier coatings due to its superior thermal and mechanical properties. However, the water vapor corrosion resistance of single-component RE-silicate materials, such as Y2SiO5, needs further improvement. The high-entropy design, investigated in this study, enhances the corrosion resistance of the multicomponent RE-silicate ((Lu0.25Yb0.25Er0.25Y0.25)2SiO5, 4HES) and single-component RE-silicate (Y2SiO5) coatings. The 4HES coating demonstrated better corrosion resistance than the Y2SiO5 coating, indicated by the formation of a thinner and denser corrosion layer. The improved corrosion resistance is attributed to the hydrophobic property and stable crystal structure resulting from the high-entropy design.

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Article Materials Science, Ceramics

Impact of the A-site rare-earth ions (Ln3+ - Sm3+, Eu3+, Gd3+) on structure and electrical properties of the high entropy LnCr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 perovskites

V. E. Zhivulin et al.

Summary: High entropy perovskite LnCr(0.2)Mn(0.2)Fe(0.2)Co(0.2)Ni(0.2)O(3) ceramics were synthesized via solid-state reactions and the effect of rare earth ions on lattice, microstructure, and electrical properties was investigated. The study revealed the correlation between lattice parameters and rare earth ion nature and observed the impact of rare earth ions on microstructural parameters. Furthermore, the charge conduction mechanisms were discussed for various temperatures.

CERAMICS INTERNATIONAL (2022)

Article Materials Science, Multidisciplinary

Ab initio investigation of phase stability, thermo-physical and mechanical properties of (Mo0.2Cr0.2Ta0.2Nb0.2X0.2)Si2 (X = W, V) high-entropy refractory metal silicides

Zepeng Xiao et al.

Summary: In this study, the phase stability, thermo-physical, and mechanical properties of C40-type high entropy silicides were systematically calculated using density functional theory. The results showed that both silicides are thermodynamically and mechanically stable, with MoCrTaNbW)Si2 exhibiting higher strength in application. The analysis revealed the critical role of d orbital electron occupancy in determining the mechanical properties of silicides.

COMPUTATIONAL MATERIALS SCIENCE (2022)

Review Materials Science, Multidisciplinary

Entropy stabilized multicomponent oxides with diverse functionality - a review

Ashritha Salian et al.

Summary: High-entropy oxides (HEOs) have captured significant scientific attention for their exceptional and tunable properties, with the main driving force being the control of configurational entropy to achieve phase purity. These new oxide candidates show great potential for practical applications and represent a key frontier for researchers to explore.

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A-Site Cation Size Effect on Structure and Magnetic Properties of Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 High-Entropy Solid Solutions

Denis A. Vinnik et al.

Summary: Three high-entropy Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 perovskite solid solutions were synthesized using ceramic technology, exhibiting single-phase perovskite products and variations in unit cell volumes and parameters with different rare-earth cation sequences.

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Review on the deposition, structure and properties of high entropy oxide films: current and future perspectives

Ashritha Salian et al.

Summary: This review focuses on the fabrication process, structure, and properties of high entropy oxides films (HEOFs), highlighting both their strengths and limitations. Iconic investigations from recent articles are discussed, covering the impact of processing parameters and the role of dopants in the film. The structure-microstructural appearance and physical properties of HEOFs are also addressed, concluding with future possibilities and applications.

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Article Materials Science, Multidisciplinary

Investigation on improving corrosion resistance of rare earth pyrosilicates by high-entropy design with RE-doping

Zeyu Chen et al.

Summary: High-entropy pyrosilicates prepared by the solid-phase method show better protective performance in CMAS corrosion tests, as they can more easily precipitate apatite to protect the materials.

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Article Materials Science, Multidisciplinary

Formation and oxidation behavior of refractory high-entropy silicide (NbMoTaW)Si2 coating

Juan Kuang et al.

Summary: A high-entropy silicide coating was successfully prepared on NbMoTaW refractory alloy using a halide activated pack cementation process. The coating demonstrated excellent oxidation resistance at high temperatures due to the selective oxidation of Si and the precipitation of WSi2.

CORROSION SCIENCE (2022)

Article Chemistry, Physical

Microstructures, thermophysical properties and corrosion behaviours of equiatomic five-component rare-earth monosilicates

Yongqiang Tan et al.

Summary: Four equiatomic five-component rare earth monosilicate solid solutions were successfully prepared by spark plasma sintering. Two compositions with larger ionic radii deviation exhibited single-phase structures and homogenous elemental distributions. Both compositions achieved extremely low high-temperature thermal conductivities, similar coefficients of thermal expansion with SiC, and displayed good hightemperature stability and high corrosion resistance in water vapor.

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Article Chemistry, Multidisciplinary

Ab initio study of mechanical properties of hexagonal high-entropy ceramic (Mo0.25Nb0.25Ta0.25V0.25)(Al0.5Si0.5)2 with dual mixing of cation and anion sublattice

Xiao-Tao Chen et al.

Summary: This study investigates the mechanical properties of high-entropy ceramics with multi-cationic and -anionic structures and discusses the influence of adding aluminum in the anion sublattice. It is found that adding aluminum in the anion sublattice can transition the material from brittleness to ductility, but at the expense of strength and hardness. The presence of aluminum also increases the anisotropy of the material.

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A new type of compositionally complex M5Si3 silicides: Cation ordering and unexpected phase stability

Sashank Shivakumar et al.

Summary: A new type of compositionally complex silicides has been synthesized, demonstrating stable hexagonal gamma phase and cation ordering. This work expands the field of high entropy ceramics and shows potential for high-entropy counterparts to Nb-silicide and Mo-Si-B composites.

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High-entropy rare-earth disilicate (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7: A potential environmental barrier coating material

Xiaotong Guo et al.

Summary: A new high-entropy ceramic (5RE(0.2))(2)Si2O7 was proposed as a potential environmental barrier coating material for ceramics matrix composites. The (5RE(0.2))(2)Si2O7 showed good phase stability, low coefficient of thermal expansion and thermal conductivity, and exhibited better water vapor corrosion resistance.

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Interaction of high-entropy rare-earth monosilicate environmental barrier coatings subjected to corrosion by calcium-magnesium-alumino-silicate melts

Dong Fan et al.

Summary: In this study, the CMAS corrosion behavior of high-entropy monosilicate coatings and Y2SiO5 coating was investigated and compared. The results showed that the high-entropy coatings exhibited improved corrosion resistance, which could be attributed to the doped rare-earth elements enhancing the stability of crystal structure and facilitating the formation of garnet phase.

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Preparation and corrosion resistance of high-entropy disilicate (Y0.25Yb0.25Er0.25Sc0.25)2Si2O7 ceramics

Xu Wang et al.

Summary: A novel high-entropy disilicate EBC material with good high temperature stability and relatively good ability for resisting molten CMAS corrosion was successfully prepared in this study.

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Improved thermophysical properties of rare-earth monosilicates applied as environmental barrier coatings by adjusting structural distortion with RE-doping

Gui Cao et al.

Summary: Four kinds of quinary high-entropy rare-earth monosilicates and (Y1-xYbx)(2)SiO5 have been synthesized by solid-state reaction method. The introduction of different rare-earth ion species can change the distortion degrees of [REOm], but only introducing Yb3+ into Y3+ sites of Y2SiO5 is more effective in improving the distortion degrees. Additionally, RE-doping enhances the distortion and phonon scattering, contributing to a lower thermal conductivity.

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First-principles exploration of elastic anisotropy and thermal properties of the C40-type VSi2, NbSi2, and TaSi2 disilicides

Yuyu Wu et al.

Summary: The anisotropy in elastic and thermal properties of TMSi2 (TM = Ta, Nb, V) disilicides were calculated using DFT, with TaSi2 exhibiting the highest elastic modulus and lowest thermal conductivity.

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