The effect of ZrO<sub>2</sub> alloying on the microstructures and thermal properties of DyTaO<sub>4</sub> for high‐temperature application

Wu, Peng; Hu, Mingyu; Chen, Lin; Wu, Fushuo; Chong, Xiaoyu; Feng, Jing

doi:10.1111/jace.16118

Cited by 16 publications

(13 citation statements)

References 31 publications

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“…Besides, the larger elastic resilience of M-phase YTaO 4 may be also relevant to the effect of its microstructure on stress. Previous researches have revealed that the ferroelastic domain analogous to twin structure existed in M-phase RETaO 4 ceramics, 21,22 which originates from its ferroelastic transition. However, according to the phase transformation principle of RETaO 4 compounds, 17 there is not ferroelastic domain in the microstructure of M' phase RETaO 4 compounds since it does not experience the reconstructive transformation from M' to T phases and the ferroelastic transition between T and M phases.…”

Section: Resultsmentioning

confidence: 99%

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Zhou

et al. 2019

J Am Ceram Soc

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In this work, the dense bulk polymorphous YTaO4 ceramics with M or M' phase are synthesized by spark plasma sintering method accompanying with different tempering procedures. Combined with the nano‐indentation and theoretical calculation, their mechanical properties are systematically investigated. The identification of crystal structure reveals that the YTaO4 crystallizes into M phase (space group: I2/a) with higher tempering temperature, otherwise it crystallizes into M' phase (space group: P2/a). The results of mechanical properties indicate M‐phase YTaO4 possesses larger Young's modulus and hardness than that of M' phase. It is stemmed from the chemical bonding strength of M phase is stronger than that of M' phase, and the stronger bonding strength of M phase also results in its elastic resilience is superior to M' phase. Besides, on account of the low symmetry of monoclinic crystal system, the Young's modulus of polymorphous YTaO4 ceramics exhibit strong anisotropy.

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Section: Resultsmentioning

confidence: 99%

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Zhou

et al. 2019

J Am Ceram Soc

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“…Moreover, pure RETaO 4 , RE 3 TaO 7 , and RETa 3 O 9 have been widely studied, and in order to optimize the thermal properties, doping (including Mg 2+ , 12 Al 3+ , 13 Zr 4+ , 14,15 and Nb 5+ 16-18 ) methods and defect engineering have been shown to be an effective and promising approach. 12,15,[19][20][21][22][23] The results showed that they had lower thermal conductivity and excellent TECs compared with 7-8YSZ. 19 In addition, relevant studies have revealed that RETaO 4 has a ferroelastic domain, 24 which enhances the fracture toughness of materials.…”

Section: Methodsmentioning

confidence: 99%

“…The Birch-Murnaghan equation of state (EOS) with four parameters was employed for the polymorphous YTaO 4 to fit A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Computational Methods and Detailsmentioning

confidence: 99%

“…For T YTaO 4 , the phonon spectrum has imaginary frequencies, indicating that this structure is unstable at 0 K, which is in consistent with the experimental observation that T ( 1) A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

Section: Methodsmentioning

confidence: 99%

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First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

Zhou

Gan

et al. 2021

J Am Ceram Soc.

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Yttrium tantalate ceramics with ferroelasticity are potential candidates for thermal barrier coating (TBC) ceramics. During the phase transition process, there are three main phases with monoclinic (I2/a), monoclinic-prime (P2/a), and tetragonal structures (I 41 /a), and a comprehensive understanding of their thermophysical properties is required. In this study, the thermal and mechanical properties of polymorphous yttrium tantalate (YTaO 4 ) ceramics are systematically investigated under finite temperature by performing first-principles calculations combined with quasi-harmonic approximation. The first-principle study results show that the volume change from M' to T phase is 12.85 Å 3 to 12.95 Å 3 per atom, whereas the T to M is 12.95 Å 3 to 12.84 Å 3 per atom, and the change is less than 1%, showing that this process produces almost no volume change.However, the thermal expansion coefficients (TECs) and Young's modulus vary greatly, the TECs value of M YTaO 4 is about 11.13 × 10 −6 K −1 , which is smaller than T YTaO 4 as the value 12.01 × 10 −6 K −1 , and the Young's modulus values of M, M', and T phases are 140. 34, 156.68, and 123.29 GPa, respectively. Lastly, the calculated O-Ta bond is stronger than the O-O and O-Y bonds according to the mean bond population and average bond length, resulting in a higher modulus. This work will not only expand the internal mechanism of the thermophysical properties of YTaO 4 , but also provides support for the design and application of TBC systems.

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“…NiO/CoO added into LaNbO 4 would distinctly optimize the quality factor since the larger and uniform grain was obtained [192]. Although the thermal properties [193][194][195][196] and the first-principles calculation of electronic structure and optic properties of RETaO 4 (RE = Y, La, Sm, Eu, Dy, Er) [197] have been investigated, the intrinsic dielectric loss has not been summarized in this system. Microwave dielectric properties of ErNbO 4 prepared by sol-gel method were reported by Devesa et al [198], and the grain size varied from 31.27 to 86.65 µm and 40.96 to 78.23 µm by Rietveld refinement and Sherrer's formula, respectively.…”

Section: Retico 6 Ceramicsmentioning

confidence: 99%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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

Cited by 16 publications

References 31 publications

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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

Cited by 16 publications

References 31 publications

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO4ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO4ceramics

First‐principles study of thermophysical properties of polymorphous YTaO4 ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Contact Info

Product

Resources

About

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

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics