Mechanical and thermal properties of RETaO4 (RE = Yb, Lu, Sc) ceramics with monoclinic-prime phase

doi:10.1016/j.jmst.2020.02.051

Abstract

Abstract:

As candidate thermal/environmental barrier coatings (T/EBCs), the structure characteristics and comprehensive properties of monoclinic-prime (m') RETaO₄ (RE = Yb, Lu, Sc) with excellent Al₂O₃/SiO₂ chemical compatibility are studied. Excellent thermal insulation protection will be provided by m'RETaO₄ due to their low thermal conductivity (～1.6 W m ^-1 K ^-1, 900 °C) and prominent thermal radiation resistance, which is much better than those of YSZ (～2.5 W m ^-1 K ^-1, 1000 °C) and La₂Zr₂O₇ (～2.0 W m ^-1 K ^-1, 900 °C). The thermal expansion coefficients (TECs) are 3.0-8.0 × 10 ^-6 K ^-1 (200-1200 °C), which is suitable for T/EBCs applications. Furthermore, absence of phase transition and extraordinary chemical compatibility with Al₂O₃/SiO₂ up to 1500 °C indicate the potential application prospect. The documented governing mechanisms of m'RETaO₄ properties will enable researchers to promote their application in the future investigation.

Key words: Ceramics, Thermal/environmental barrier coatings, Rare earth tantalates, Mechanical property, Thermal conductivity, Chemical compatibility

Lin Chen, Mingyu Hu, Jun Guo, Xiaoyu Chong, Jing Feng. Mechanical and thermal properties of RETaO₄ (RE = Yb, Lu, Sc) ceramics with monoclinic-prime phase[J]. J. Mater. Sci. Technol., 2020, 52: 20-28.

Figures/Tables 12

Fig. 1. Structures identification of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) XRD patterns, 10-60?; (b) XRD patterns, 26-32?; (c) Raman spectra, 100-1000 cm-1; (d) Raman spectra, 800-900 cm-1; (e) Raman spectra, 245-345 cm-1.

Table 1 RE3+ ionic radius (R/nm), lattice parameter (a, b, c/?), beta angle (β/o), unit cell volume (V/?3), bulk density (ρ/g. cm-3), relative density (ρR/%), and refinement index (sig and Rwp/%) of m'RETaO4 (RE = Yb, Lu, Sc) ceramics.

Sample	R	a	b	c	β	V	ρ	ρ_R	sig	R_wp
YbTaO₄	0.99	5.25	5.42	5.07	96.20	143.5	9.17	94.8	3.50	16.41
LuTaO₄	0.98	5.24	5.43	5.06	96.06	141.8	9.29	95.2	5.09	22.19
ScTaO₄	0.75	5.12	5.67	4.81	91.65	134.0	7.03	98.0	3.38	14.26

Fig. 2. XRD Retvield Refinement results of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) YbTaO4; (b) LuTaO4; (c) ScTaO4.

Table 2 The REO and TaO bond lengths (d/?), mean values of bond length (D/?) in [REON] and [TaON] (N = 6, 8) polyhedrons, and polyhedron’s distortion degree (Δd/%) of m'RETaO4 (RE = Yb, Lu, Sc) ceramics.

Sample	Polyhedron	Bond	d				D	Δd
YbTaO₄	[TaO₆]	Ta-O	1.9198	1.9832	2.4842		2.1291	2.99
YbTaO₄	[YbO₈]	Yb-O	2.1266	2.1989	2.2744	2.5605	2.2901	1.18
LuTaO₄	[TaO₆]	Ta-O	1.9302	1.9649	2.4463		2.1138	2.62
LuTaO₄	[LuO₈]	Lu-O	1.9789	2.2265	2.4657	2.5937	2.3162	2.39
ScTaO₄	[TaO₆]	Ta-O	1.9614	2.0218	2.1531		2.0454	0.31
ScTaO₄	[ScO₆]	Sc-O	2.0380	2.0707	2.0723		2.0603	0.01

Fig. 3. Characteristics of crystal structures of m' phase RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) YbTaO4; (b) ScTaO4.

Fig. 4. Surface microstructure observation of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) YbTaO4; (b) LuTaO4; (c) ScTaO4.

Fig. 5. Mechanical properties of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) The relationship between elastic modulus and acoustic velocity; (b) Young’s modulus [22,36,37].

Table 3 Acoustic velocity (VL, VT, VM/m.s-1), elastic modulus (E, G, B/GPa), Poisson ratio (ν), and Grüneisen parameter (γ) of m'RETaO4 (RE = Yb, Lu, Sc) ceramics.

Sample	V_L	V_T	V_M	E	G	B	ν	γ
YbTaO₄	4155	2262	2523	122	47	96	0.29	1.70
LuTaO₄	4193	2266	2530	124	48	100	0.29	1.73
ScTaO₄	6524	3597	4009	268	102	227	0.30	1.80

Fig. 6. Thermal expansion performance of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) Thermal expansion rate; (b) TECs; (c) The influence factors of TECs.

Fig. 7. Thermal transport properties of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) Specific heat; (b) Thermal diffusivity; (c) Temperature dependent thermal conductivity; (d) Phonon mean free path; (e) Thermal conductivity [5,36,43,44].

Fig. 8. Investigation on high-temperature thermal conductivity of m'RETaO4 (RE = Yb, Lu, Sc) ceramics; (a) Reciprocal thermal diffusivity; (b) Comparison of ScTaO4 thermal diffusivity; (c) Thermal conductivity of ScTaO4; (d) Thermal conductivity of YbTaO4; (e) Thermal conductivity of LuTaO4.

Fig. 9. XRD results of high-temperature heat treatment m'RETaO4 (RE = Yb, Lu, Sc) ceramics mixed with Al2O3/SiO2; (a) YbTaO4+Al2O3; (b) YbTaO4+SiO2; (c) LuTaO4+Al2O3; (d) LuTaO4+SiO2; (e) ScTaO4+Al2O3; (f) ScTaO4+SiO2.

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Mechanical and thermal properties of RETaO₄ (RE = Yb, Lu, Sc) ceramics with monoclinic-prime phase

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