Microstructure and thermal properties of RETaO4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) as promising thermal barrier coating materials

Wang, Jun; Chong, Xiaoyu; Zhou, Rong; Feng, Jing

doi:10.1016/j.scriptamat.2016.08.019

Cited by 157 publications

(48 citation statements)

References 18 publications

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“…Moreover both theoretical and experimental results reveal that YTaO 4 ceramic exists ferroelastic transformation with almost no volume difference, and the ferroelastic transformation of YTaO 4 ceramic may lead to high fracture toughness similar to YSZ . In the previous work, we synthesized RETaO 4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with similar properties to YTaO 4 by solid‐state reaction, and verified its potential as TBC application.…”

Section: Introductionmentioning

confidence: 64%

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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In this work, RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo‐mechanical properties indicate that RENbO4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X‐ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high‐temperature solid‐state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO4 ceramics. The Young's modulus and hardness of the RENbO4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60‐170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO4 ceramics to failure and damage. Lower thermal conductivity (1.42‐2.21 W [m k]−1 at 500°C‐900°C) and lower density (5.330‐7.400 g/cm3) than other typical TBCs materials give RENbO4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO4 ceramics reach 9.8‐11.6 × 10−6 k−1 and are comparable or higher than other typical TBCs materials. According to the first‐order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO4 ceramics can be observed.

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Section: Introductionmentioning

confidence: 64%

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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“…3d). The particles were formed from highly coalesced spherical particles with diameter ~ 50-100 nm [9,30,31]. The SEM/EDX analyses of SNO and STO powders at 1000°C, respectively are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

Bruncková

Medvecký

Múdra

et al. 2017

Powder Metallurgy Progress

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INTRODUCTIONRecently, the lanthanide (Ln = La, Nd, Sm, Eu and Gd) orthoniobates LnNbO 4 (LnNO) and orthotantalates LnTaO 4 (LnTO) materials have been developed for wide applications in satellite communication systems [1]. Samarium niobate SmNbO 4 (SNO) and tantalate SmTaO 4 (STO) films can be used as phosphors for solid-state lighting, as photocatalysts in solid-state laser materials and as ion conductors for solid oxide fuel cells. Samarium niobate (SmNbO 4 ) and tantalate (SmTaO 4 ) with fergusonite structure have attracted a great deal of attention due to their interesting physical properties, such as high dielectric constants, electro-optical, photoelastic, photocatalytic and luminescent properties as well as good mechanical and chemical stability. For SNO, there are two crystalline forms, the low temperature M-phase isostructural with monoclinic form of the fergusonite and the high temperature T-phase corresponding to tetragonal scheelite. The transition between two phases occurs reversibly in the range 500-800°C [2]. STO crystallizes in monoclinic form, besides its ability to possess two fergusonite-type structures, first known as M-type (I2/a) and second called M´-type (P2/a) [1,2].

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“…Our previous research using the first principles calculations have found that the YTaO 4 possesses high‐temperature phase transition between the tetragonal and monoclinic phase, and it is a reversible second‐order ferroelastic transformation with little volume change . Wang et al have investigated the thermal properties of the rare earth tantalates (RETaO 4 , RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) and found that the RETaO 4 ceramics have lower thermal conductivities than 7‐8 YSZ, among which DyTaO 4 possesses the lowest thermal conductivity. The compounds of rare earth tantalate, in addition to RETaO 4 , mainly contain RE 3 TaO 7 and RETa 3 O 9 .…”

Section: Introductionmentioning

confidence: 99%

“…However, to the best of our knowledge, there are few reports on the microstructure, mechanical, and thermal properties of RETaO 4 ceramics doped with tetravalent ions. In view of DyTaO 4 possesses the lowest thermal conductivity among RETaO 4 ceramics and a certain solid solubility with ZrO 2 similar to that of YTaO 4 , the point defect is introduced to DyTaO 4 lattice by alloying with ZrO 2 , and to synthesize the Dy 1− x Ta 1− x Zr 2 x O 4 solid solution ceramics ( x = 0, 0.015, 0.03, 0.045, 0.06, and 0.075, respectively) in this work. Meanwhile, the present work also investigates the ferroelastic domain, elastic modulus, and thermal expansion coefficients of Dy 1− x Ta 1− x Zr 2 x O 4 ceramics.…”

Section: Introductionmentioning

confidence: 99%

The effect of ZrO₂ alloying on the microstructures and thermal properties of DyTaO₄ for high‐temperature application

Chen

et al. 2018

J Am Ceram Soc

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High fracture toughness of 8 YSZ (8 wt% yttria‐stabilized zirconia) is linked to its ferroelastic toughening mechanism. In this work, the similar ferroelastic domain is detected in monoclinic Dy1−xTa1−xZr2xO4 ceramics, which derives from the ferroelastic transformation between the high‐temperature tetragonal (t) and low‐temperature monoclinic (m) phase. The lowest thermal conductivity of Dy1−xTa1−xZr2xO4 ceramics is reduced by 30% compared with 8 YSZ, and the largest thermal expansion coefficients (TECs) is up to 11 × 10−6 K−1 at 1200°C, which is comparable to that of 8 YSZ. Notably, the systematic investigations containing phase, microstructure, thermophysical properties of Dy1−xTa1−xZr2xO4 ceramics will provide guidance for its high‐temperature application, especially as thermal barrier coatings.

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Microstructure and thermal properties of RETaO4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) as promising thermal barrier coating materials

Cited by 157 publications

References 18 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

The effect of ZrO₂ alloying on the microstructures and thermal properties of DyTaO₄ for high‐temperature application

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Microstructure and thermal properties of RETaO4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) as promising thermal barrier coating materials

Cited by 157 publications

References 18 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

The effect of ZrO2 alloying on the microstructures and thermal properties of DyTaO4 for high‐temperature application

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The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄ (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The effect of ZrO₂ alloying on the microstructures and thermal properties of DyTaO₄ for high‐temperature application