Thermo-mechanical properties of fluorite Yb3TaO7 and Yb3NbO7 ceramics with glass-like thermal conductivity

Chen, Lin; Hu, Mingyu; Wu, Fushuo; Song, Peng; Feng, Jing

doi:10.1016/j.jallcom.2019.02.317

Cited by 36 publications

(18 citation statements)

References 41 publications

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“…The mean acoustic velocity (2860‐3430 m/s) and Young's modulus (100‐170 GPa) tested by ultrasonic reflection method increase with the lanthanide contraction, which is similar with the phenomenon of Vickers hardness and fracture toughness shown in Figure 5A 33,34 . The fitting relationships between mechanical properties and RE 3+ ionic radius are depicted.…”

Section: Results and Analysissupporting

confidence: 72%

“…The mean acoustic velocity (2860-3430 m/s) and Young's modulus (100-170 GPa) tested by ultrasonic reflection method increase with the lanthanide contraction, which is similar with the phenomenon of Vickers hardness and fracture toughness shown in Figure 5A. 33,34 The fitting relationships between mechanical properties and RE 3+ ionic radius are depicted. The hardness and toughness increase accompanied by the increasing Young's modulus depicted in Figure 5B, the enhancement of bonding strength will directly result in increment of hardness and toughness.…”

Section: Methodssupporting

confidence: 72%

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Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

et al. 2020

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Abundant oxides are studied to replace present thermal barrier coatings (TBCs), yttria-stabilized zirconia (YSZ), to perfect the application performances. 1-8 YSZ displays relatively high thermal conductivity (2.5 W•m −1 •K −1 , 1000°C), high Young's modulus (~230 GPa), low application temperature (≤1200°C), and weak CaO-MgO-Al 2 O 3-SiO 2 corrosion resistance. 1,2,9-12 To conquer the weaknesses, multifarious means are applied to perfect YSZ properties, and diverse oxides are researched as novel TBCs. 3,6,13-20 RE 3 NbO 7 oxides (RE is rare earth) are considered as structural materials, as that they display low thermal conductivity (1.0-2.0 W•m −1 •K −1 , 25-900°C), high thermal expansion coefficients (11 × 10 −6 K −1 , 1200°C), and exceptional corrosion resistance. 16,21 The thermal transport mechanism and mechanical properties of fluorites RE 3 NbO 7 are well documented, and the thermal properties of weberites RE 3 NbO 7 are reported. 16,21,22 Besides thermal properties, hardness, toughness, and modulus are vital, nevertheless, the dominant mechanisms of mechanical properties of weberites RE 3 NbO 7 are not clear. The critical factors of hardness, toughness and modulus of ceramics include lattice distortion degree, bond length, microstructure features, and others. Suitable hardness, toughness, and modulus are demanded, and their mutual relations are connective. 23-26 To obtain TBCs with excellent working performance, the mechanical properties and corresponding dominant mechanisms are of great importance. The correlations among crystal structures, surface appearances and mechanical properties of weberites RE 3 NbO 7 are researched. The influences of bond length, lattice distortion degree, crystal structures and microstructures on mechanical properties are studied. Furthermore, the correlations between thermal and mechanical properties are connected. The dominant

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Section: Results and Analysissupporting

confidence: 72%

Section: Methodssupporting

confidence: 72%

Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

et al. 2020

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“…Moreover, the severe sintering and high oxygen conductivity also limit its application in higher operation temperatures [7,14]. In order to further increase the operating temperatures of gas-turbine engines, several types of new TBC materials such as RE 2 Zr 2 O 7 , RE 3 NbO 7 , and RE 3 TaO 7 (RE = rare earth element) with better thermal stability and lower thermal conductivity have been proposed [15][16][17]. In particular, rare-earth tantalates (RE 3 TaO 7 ) and rare-earth niobates (RE 3 NbO 7 ) have attracted enormous attention in recent years.…”

Section: Introduction mentioning

confidence: 99%

High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

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Rare-earth tantalates and niobates (RE 3 TaO 7 and RE 3 NbO 7) have been considered as promising candidate thermal barrier coating (TBC) materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia (YSZ). However, the low Vickers hardness and toughness are the main shortcomings of RE 3 TaO 7 and RE 3 NbO 7 that limit their applications as TBC materials. To increase the hardness, high entropy (

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“…The BE in synthetic Yb 2 Zr 2 O 7 is lower than in Yb 0.2 Zr 0.8 O 1.9 , which could be ascribed to crystal structure transformation from disordered fluorite structure to pyrochlore structure. scattering of the phonons by oxygen vacancies [14] and the crystal structure transformation from disordered fluorite structure to pyrochlore structure [8].…”

Section: Phases and Structures Of Yb 2 O 3 -Zro 2 Systemmentioning

confidence: 99%

“…The rare-earth zirconate ceramics are usually synthesized by solid state reaction in furnace involving a long reaction time and high temperature. The solid-state reaction occurs commonly above 1600°C for more than 12 h to generate the target products, leading to excessive energy consumption and inhomogeneity [8,13,14]. Employing the solid-state reaction at 1600°C for 12 h, Zhou et al have synthesized novel thermal barrier coating Y 4 Al 2 O 9 (YAM) ceramic with low thermal conductivity [13].…”

Section: Introductionmentioning

confidence: 99%

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation

He¹,

Huang²,

Hu³

et al. 2020

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A low-cost and minimal-processing-step method is demonstrated to synthesize Yb 2 O 3 -ZrO 2 system by laser excitation catalyzed solid-state reaction. With 980 nm CW laser irradiating, near-resonant excitation of Yb 3+ ions can obviously enhance solid state reaction. As the molar content of Yb 2 O 3 rises from 12.5% to 50%, the lattice parameter of Yb 2 O 3 -ZrO 2 ceramic increases distinctly. Among them, high crystal quality of Yb 2 Zr 2 O 7 and Yb 0.2 Zr 0.8 O 1.9 are synthesized at the laser power of 400 W for 10 s. Two obvious Raman peaks of Yb 2 Zr 2 O 7 represent increased Raman activity. X-ray photoelectron spectroscopy (XPS) and Impedance spectroscopy demonstrate the huge amount of the oxygen vacancies in Yb 0.2 Zr 0.8 O 1.9 . Yb 2 Zr 2 O 7 shows lowest thermal conductivity among all the ceramics studied, within the range of 0.497-0.730 W mK −1 from 25°C to 1200°C, which indicates a promising thermal barrier material.

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Thermo-mechanical properties of fluorite Yb3TaO7 and Yb3NbO7 ceramics with glass-like thermal conductivity

Cited by 36 publications

References 41 publications

Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation

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Thermo-mechanical properties of fluorite Yb3TaO7 and Yb3NbO7 ceramics with glass-like thermal conductivity

Cited by 36 publications

References 41 publications

Features of crystal structures and thermo‐mechanical properties of weberites RE3NbO7 (RE=La, Nd, Sm, Eu, Gd) ceramics

Features of crystal structures and thermo‐mechanical properties of weberites RE3NbO7 (RE=La, Nd, Sm, Eu, Gd) ceramics

High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

Thermal barrier materials of Yb2O3-ZrO2 system synthesized by laser excitation

Contact Info

Product

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Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

Features of crystal structures and thermo‐mechanical properties of weberites RE₃NbO₇ (RE=La, Nd, Sm, Eu, Gd) ceramics

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation