<trans-title>Preparation and Thermal Properties of Rare Earth Tantalates (RETaO<sub>4</sub>) High-Entropy Ceramics</trans-title>

Jiatong ZHU; Zhihao LOU; Ping ZHANG; Jia ZHAO; Xuanyu MENG; Jie XU; Feng GAO

doi:10.15541/jim20200426

Journal of Inorganic Materials, Volume. 36, Issue 4, 411(2021)

Preparation and Thermal Properties of Rare Earth Tantalates (RETaO₄) High-Entropy Ceramics

Jiatong ZHU, Zhihao LOU, Ping ZHANG, Jia ZHAO, Xuanyu MENG, Jie XU^*, and Feng GAO

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

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Figures & Tables(12)

1. XRD patterns of high-entropy RETaO₄ceramics after sintering at 1500 ℃ for 10 h

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2. Raman spectra of high-entropy RETaO₄ ceramics

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3. STEM-EDS of high-entropy tantalates

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4. SAED patterns of (a1) 4RETaO₄, (b1) 5RETaO₄ and (c1) 6RETaO₄; HRTEM images of (a2) 4RETaO₄, (b2) 5RETaO₄ and (c2) 6RETaO₄

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5. Schematic diagram of 5RETaO₄ crystal structure

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6. SEM images of high-entropy tantalates

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7. Thermal expansion of high-entropy RETaO₄

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8. Thermal properties of high-entropy RETaO₄

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Table 1. Theoretical density, experimental density, porosity, and average grain size of high-entropy tantalates
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Table 1. Theoretical density, experimental density, porosity, and average grain size of high-entropy tantalates
Sample ρ_thr/(g·cm^-3) ρ_exp/(g·cm^-3) Porosity/% d_grain/μm
4RETaO₄ 8.593 8.441 1.77 2.96
5RETaO₄ 8.735 8.597 1.58 6.63
6RETaO₄ 8.983 8.758 2.50 3.29

Table 2. Detail structure information of high-entropy RETaO₄ceramics and the average radii of doped rare-earth ions
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Table 2. Detail structure information of high-entropy RETaO₄ceramics and the average radii of doped rare-earth ions
Sample a/nm b/nm c/nm β/(°) $r_{RE^{3+}}$/nm
4RETaO₄ 0.544 1.112 0.508 95.65 10.767
5RETaO₄ 0.542 1.108 0.508 95.64 10.668
6RETaO₄ 0.537 1.099 0.504 95.57 10.581

Table 3. HV hardness of high-entropy tantalates
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Table 3. HV hardness of high-entropy tantalates
Sample HV/GPa
4RETaO₄ (7.92±2.33)
5RETaO₄ (6.15±1.60)
6RETaO₄ (9.97±2.20)

Table 4. Thermal conductivity of 6RETaO₄, single rare earth tantalates, and YSZ (100-900 ℃)
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Table 4. Thermal conductivity of 6RETaO₄, single rare earth tantalates, and YSZ (100-900 ℃)
Material 6RETaO₄ NdTaO₄ SmTaO₄ EuTaO₄ GdTaO₄ DyTaO₄ HoTaO₄ YSZ
Thermal conductivity/(W·m^-1·K^-1) 2.78-1.30 3.41-1.75 2.70-1.45 3.23-1.26 3.94-1.28 3.45-1.80 3.35-1.47 3.02-2.38

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Jiatong ZHU, Zhihao LOU, Ping ZHANG, Jia ZHAO, Xuanyu MENG, Jie XU, Feng GAO. Preparation and Thermal Properties of Rare Earth Tantalates (RETaO₄) High-Entropy Ceramics[J]. Journal of Inorganic Materials, 2021, 36(4): 411

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Paper Information

Category: RESEARCH PAPER

Received: Aug. 5, 2020

Accepted: --

Published Online: Nov. 24, 2021

The Author Email: Jie XU (xujie@nwpu.edu.cn)

DOI:10.15541/jim20200426

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Theoretical density, experimental density, porosity, and average grain size of high-entropy tantalates

Table 1. Theoretical density, experimental density, porosity, and average grain size of high-entropy tantalates

Table 2. Detail structure information of high-entropy RETaO4 ceramics and the average radii of doped rare-earth ions

Table 2. Detail structure information of high-entropy RETaO4 ceramics and the average radii of doped rare-earth ions

Table 3. HV hardness of high-entropy tantalates

Table 3. HV hardness of high-entropy tantalates

Table 4. Thermal conductivity of 6RETaO4, single rare earth tantalates, and YSZ (100-900 ℃)

Table 4. Thermal conductivity of 6RETaO4, single rare earth tantalates, and YSZ (100-900 ℃)

Table 2. Detail structure information of high-entropy RETaO₄ceramics and the average radii of doped rare-earth ions

Table 2. Detail structure information of high-entropy RETaO₄ceramics and the average radii of doped rare-earth ions

Table 4. Thermal conductivity of 6RETaO₄, single rare earth tantalates, and YSZ (100-900 ℃)

Table 4. Thermal conductivity of 6RETaO₄, single rare earth tantalates, and YSZ (100-900 ℃)