Investigation of the thermophysical properties of (Y1-xYbx)TaO4 ceramics

Wu, Peng; Chong, Xiaoyu; Wu, Fushuo; Hu, Mingyu; Guo, Hongbo; Feng, Jing

doi:10.1016/j.jeurceramsoc.2020.03.007

Cited by 20 publications

(15 citation statements)

References 49 publications

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“…Synthesis of YbTaO 4 by spark plasma sintering (SPS) was attempted as reported in the literature (various experiments with T 1600 • C, p 500 bar, fast or slow cooling [48]) but was unsuccessful, producing only the M phase with unreacted Yb 2 O 3 and Ta 2 O 5 . It thus appears that the relative stability of M over M increases across the lanthanide series with decreasing ionic radius, since LuTaO 4 also favors the M phase [19] and the solid solution Y 1−x Yb x TaO 4 favors M when x 0.5 [49].…”

Section: A Crystal Structurementioning

confidence: 99%

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Kelly

Liu

Pearson

et al. 2022

Phys. Rev. Materials

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The magnetic lanthanide (Ln 3+ ) ions in the fergusonite and scheelite crystal structures form a distorted or stretched diamond lattice which is predicted to host exotic magnetic ground states. In this study, polycrystalline samples of the fergusonite orthotantalates M-LnTaO 4 (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) were synthesized and then characterized using powder diffraction and bulk magnetometry and heat capacity. TbTaO 4 orders antiferromagnetically at 2.25 K into a commensurate magnetic cell with k = 0, magnetic space group 14.77 (P2 1 /c), and Tb moments parallel to the a axis. No magnetic order was observed in the other materials studied, leaving open the possibility of exotic magnetic states at T < 2 K.

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Section: A Crystal Structurementioning

confidence: 99%

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Kelly

Liu

Pearson

et al. 2022

Phys. Rev. Materials

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“…Apart from the Debye temperature and Grüneisen parameter, all parameters in Equation () can be derived from the relevant crystallographic information file (CIF). According to the related theory, they can be calculated through longitudinal ( ν l ) and transversal ( ν t ) sound velocities [ 11 ]

θ_{D} = \frac{h}{k_{normalB}} {(\frac{3 n}{4 π V})}^{1 / 3} \times {(\frac{3 {(υ_{normalt} υ_{normall})}^{3}}{2 υ_{normall}^{3} + υ_{normalt}^{3}})}^{1 / 3}

γ = \frac{9 (υ_{normall}^{2} - 4 υ_{normalt}^{2} / 3)}{2 (υ_{normall}^{2} - 2 υ_{normalt}^{2})}

where h is Plank's constant, k B is Boltzmann constant and V is the volume of the primitive unit cell. The longitudinal ( ν l ) and transversal ( ν t ) sound velocities can be obtained by shear modulus ( G H ), bulk modulus ( B H ), and density ( ρ ).…”

Section: Resultsmentioning

confidence: 99%

“…[ 10 ] At elevated temperature (1173 K), the minimum thermal conductivity (1.15 W m −1 K −1 ) of rare earth tantalate is obtained, and the thermal conductivity is decreased by about 50% compared to that of YSZ. [ 11 ] Moreover, its CET is as high as 11 × 10 −6 K −1 [10g] . Recent researches reveal that the fracture toughness of rare earth tantalate can be up to 3 MPa m 1/2 , which is also equal to that of YSZ [10h] .…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties in the YNbO₄─ZrO₂Pseudo‐Binary Phase Diagram with YNbO₄‐Rich End

Chen

Li³

et al. 2022

Adv Eng Mater

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The matrix YNbO4 ceramics with a series of content of ZrO2 is synthesized by the conventional solid‐state reaction method in the present article. Owing to the similarity in structure, the YNbO4 parent lattice is capable of solubilizing a large number of Zr atoms until its content exceeds 30 mol%. Lattice distortion introduced by the dopant leads to the shift of X‐Ray diffraction (XRD) and the increase of full width at half maximum (FWHM) in the Raman‐active peak. The results of the scanning electron microscope and energy‐dispersive spectroscopy reveal that the ZrO2 that exists in the YNbO4 matrix as a second phase can significantly enhance polycrystalline sintering resistance, presenting minimum grain size under the same sintering condition. The results of thermophysical properties indicate that the investigated compositions in the YNbO4─ZrO2 pseudo‐binary phase show lower thermal diffusivity and thermal conductivity than that of both pure phases. The minimum thermal conductivity is 1.5 W m−1 K−1, which is lower than that of 8YSZ. Furthermore, its heat transfer obeys phonon to phonon and phonon to defect scattering mechanisms.

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“…where h, k B , N, and V are the Plank's constant, the Boltzmann constant, the number of atoms in a unit cell, and the volume of a unit cell, respectively [41]. The k Slack of the (Gd 1−x Y x )TaO 4 ceramics are compared with the experimental thermal conductivities, as plotted in Figs.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Low thermal conductivity and anisotropic thermal expansion of ferroelastic (Gd1−xYx)TaO4 ceramics

Chen²,

Lv³

et al. 2022

J Adv Ceram

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In this paper, (Gd1−xYx)TaO4 ceramics had been fabricated by solid-phase synthesis reaction. Each sample was found to crystallize in a monoclinic phase by X-ray diffraction (XRD). The properties of (Gd1−xYx)TaO4 were optimized by adjusting the ratio of Gd/Y. (Gd1−xYx)TaO4 had a low high-temperature thermal conductivity (1.37–2.05 W·m−1·K−1), which was regulated by lattice imperfections. The phase transition temperature of the (Gd1−xYx)TaO4 ceramics was higher than 1500 °C. Moreover, the linear thermal expansion coefficients (TECs) were 10.5×10−6 K−1 (1200 °C), which was not inferior to yttria-stabilized zirconia (YSZ) (11×10−6 K−1, 1200 °C). (Gd1−xYx)TaO4 had anisotropic thermal expansion. Therefore, controlling preferred orientation could minimize the TEC mismatch when (Gd1−xYx)TaO4 coatings were deposited on different substrates as thermal barrier coatings (TBCs). Based on their excellent properties, it is believed that the (Gd1−xYx)TaO4 ceramics will become the next generation of high-temperature thermal protective coatings.

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Investigation of the thermophysical properties of (Y1-xYbx)TaO4 ceramics

Cited by 20 publications

References 49 publications

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Thermophysical Properties in the YNbO₄─ZrO₂Pseudo‐Binary Phase Diagram with YNbO₄‐Rich End

Low thermal conductivity and anisotropic thermal expansion of ferroelastic (Gd1−xYx)TaO4 ceramics

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Investigation of the thermophysical properties of (Y1-xYbx)TaO4 ceramics

Cited by 20 publications

References 49 publications

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Thermophysical Properties in the YNbO4─ZrO2Pseudo‐Binary Phase Diagram with YNbO4‐Rich End

Low thermal conductivity and anisotropic thermal expansion of ferroelastic (Gd1−xYx)TaO4 ceramics

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Thermophysical Properties in the YNbO₄─ZrO₂Pseudo‐Binary Phase Diagram with YNbO₄‐Rich End