Synthesis and thermophysics properties of ferroelastic SmNb1-XTaXO4 ceramics

Luo, Yinyi; Chen, Lin; Wu, Peng; Song, Peng; Feng, Jing

doi:10.1016/j.ceramint.2018.04.251

Cited by 19 publications

(7 citation statements)

References 35 publications

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“…It is only one Raman vibration peak in CMW (X=0, 0.03) ceramics, when two Raman vibration peaks are detected in CMW (X=0.06, 0.09, 0.12) ceramics. Obviously, the result of Raman spectra of the whole series CMW ceramics is consistent with XRD [26].…”

Section: Resultssupporting

confidence: 80%

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

Cao

et al. 2020

Mater. Res. Express

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Tungsten (W)-doped copper molybdate (CuMo 1−x W x O 4 , x=0∼0.12) compounds were prepared by the sol-gel method. The effects of doping content on the phase transition behavior and dielectric properties of CuMo 1−x W x O 4 (x=0∼0.12) were investigated. X-ray diffraction and UV-vis diffuse reflectance spectroscopy clarified that W doping facilitated the transition of green α-phase to brown γ-phase. The chemical composition and structure of the CuMo 1−x W x O 4 (x=0∼0.12) were investigated by Fourier transform infrared (FT-IR) spectroscopy and Raman spectra. The dielectric spectra of CuMo 1−x W x O 4 at −130°C∼150°C and the color-change of CuMo 0.94 W 0.06 O 4 at 20°C∼50°C illustrated that the phasetransition temperature moves toward high temperature with increasing W. The functional relationship between the electrical modulus M' and the frequency (1 Hz∼10 MHz) indicated that there are two dielectric relaxation mechanisms for CuMo 1−x W x O 4 , which correspond to the polarization relaxation caused by hopping motion of polaron at low-temperature region (R1) and the relaxation dominated by oxygen vacancies at high temperatures (R2). It has also been confirmed that the phase transition of relaxation type exists in CuMo 1−x W x O 4 , and that R1 occurs in γ-phase and R2 occurs in α-phase. It is of great significance to establish the dielectric relationship between phase transition and relaxation. With the content of W, the intensity of relaxation peak and activation energy of R1 did not change too much, but the relaxation behavior of R2 was inhibited and the activation energy increased gradually. The above results show that dielectric spectra are an important discovery as a new method to study the phase transition of materials, and is conducive to exploring the motion state of micro-particles. The control of phasetransition temperature is of great significance for this thermochromic material as a temperature sensor.

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Section: Resultssupporting

confidence: 80%

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

Cao

et al. 2020

Mater. Res. Express

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“…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%

“…This parameter is regarded as the initial input value for the hardness at high temperatures. The H V value of polymorphous YTaO 4 under finite temperature conditions can be calculated using Equation (16), and is presented in Figure 7C. It is well known that materials soften at high temperatures, that is, the hardness decreases.…”

Section: Methodsmentioning

confidence: 99%

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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“…Wang et al [20] investigated the thermal properties of RETaO 4 (RE=Nd, Eu, Gd, Dy, Er, Yb, Lu) and found that the RETaO 4 ceramics have lower thermal conductivities than that of YSZ. Thermophysical properties, including the specific heat, thermal diffusivity, thermal conductivity and thermal expansion coefficients of SmNb 1−X Ta X O 4 ceramics, were investigated systematically by Luo et al [21]. Based on a phonon-point defect scattering theory, Wu et al conducted an optimization study on the thermophysical properties of Zr 4+ -doped DyTaO 4 [22], (Y 1−x Dy x )TaO 4 [23].…”

Section: Introductionmentioning

confidence: 99%

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics

Zhou

Gan

et al. 2020

Mater. Res. Express

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SmTaO 4 , Sm 3 TaO 7 and SmTa 3 O 9 ceramics were prepared via a high temperature solid-state reaction. The results show that the phase structures of the SmTaO 4 ceramics are a monoclinic phase (space group: I2 (5)), the Sm 3 TaO 7 ceramics are an ordered orthorhombic phase (space group: Ccmm), and the SmTa 3 O 9 ceramics are an orthorhombic phase (space group: Cmmm). Macromolecular and crystal structures of Sm 3 TaO 7 and SmTa 3 O 9 are more complex than those of SmTaO 4 , which can enhance phonon scattering and reduce thermal conductivity. Compared with those of SmTaO 4 and SmTa 3 O 9 , Sm 3 TaO 7 has the smallest grain size, indicating that a small grain size has an effect on strength and ensures material stability. Because of a distorted TaO 6 octahedron and a high concentration of cation vacancy in the lattice of SmTa 3 O 9 , its thermal conductivity increases with increasing temperature. Compared with that of 7-8 YSZ, Sm 3 TaO 7 has a low thermal conductivity (1.3-1.7 W·m −1 ·K −1 at 100°C-900°C), and its minimum thermal conductivity is nearly 30% lower than that of YSZ. The Sm 3 TaO 7 ceramics have the highest TECs at approximately 9.82×10 −6 K −1 at 1200°C, which is close to that of 7-8 YSZ (approximately 10×10 −6 ). This indicates that Sm 3 TaO 7 has the potential to be employed as a thermal barrier coating.

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Synthesis and thermophysics properties of ferroelastic SmNb1-XTaXO4 ceramics

Cited by 19 publications

References 35 publications

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics

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Synthesis and thermophysics properties of ferroelastic SmNb1-XTaXO4 ceramics

Cited by 19 publications

References 35 publications

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO4 obtained by a modified sol-gel method

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO4 obtained by a modified sol-gel method

First‐principles study of thermophysical properties of polymorphous YTaO4 ceramics

Thermophysical properties of SmTaO4, Sm3TaO7 and SmTa3O9 ceramics

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Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

Effect of W doping on phase transition behavior and dielectric relaxation of CuMoO₄ obtained by a modified sol-gel method

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics