High entropy (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 with strong anisotropy in thermal expansion

doi:10.1016/j.jmst.2019.07.022

Abstract

Abstract:

A novel high entropy (HE) rare earth monosilicate (Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅ was synthesized by solid-state reaction method. X-ray diffraction and scanning electron microscopy analysis indicate that a single solid solution is formed with homogeneous distribution of rare-earth elements. HE (Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅ exhibits excellent phase stability and anisotropy in thermal expansion. The coefficients of thermal expansion (CTEs) in three crystallographic directions are: α_a = (2.57 ± 0.07) ×10^-6 K^-1, α_b = (8.07 ± 0.13) ×10^-6 K^-1, α_c = (9.98 ± 0.10) ×10^-6 K^-1. The strong anisotropy in thermal expansion is favorable in minimizing the coating/substrate mismatch if preferred orientation of HE (Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅ is controlled on either metal or ceramic substrate.

Key words: High entropy ceramics, Rare earth monosilicates, Solid-state reaction, Thermal expansion, Anisotropy

Heng Chen, Huimin Xiang, Fu-Zhi Dai, Jiachen Liu, Yanchun Zhou. High entropy (Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅ with strong anisotropy in thermal expansion[J]. J. Mater. Sci. Technol., 2020, 36: 134-139.

Figures/Tables 8

Fig. 1. The radial shrinkage, radial shrinkage rate and temperature variation curves recorded during the heating of powder mixture green body.

Fig. 2. X-ray diffraction (XRD) pattern of as-prepared HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 together with simulated XRD patterns of Yb2SiO5, Y2SiO5, Lu2SiO5 and Er2SiO5.

Table 1 Unit cell parameters of HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 calculated from the XRD pattern and the theoretical densities of HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 together with Yb2SiO5 [35], Y2SiO5 [36], Lu2SiO5 [37] and Er2SiO5 [38].

Materials	Space group	Unit cell parameters				Theoretical density (g/cm³)
Materials	Space group	a (Å)	b (Å)	c (Å)	β (degree)	Theoretical density (g/cm³)
(Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅	C2/c	14.3109(6)	6.6773(7)	10.3363(8)	122.180(7)	7.22
Yb₂SiO₅		14.37	6.693	10.34	122.78	7.30
Y₂SiO₅		14.3797	6.7180	10.4077	122.19	4.29
Lu₂SiO₅		14.2774(7)	6.6398(4)	10.2465(6)	122.224(1)	7.4
Er₂SiO₅		14.366(2)	6.6976(6)	10.3633(1)	122.219(1)	6.97

Fig. 3. (a) Surface SEM image of as-prepared HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5, (b)?(e) Corresponding EDS mappings of Yb, Y, Lu and Er elements, (f) Grain size distribution of as-prepared HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 ceramic.

Fig. 4. (a) High-temperature XRD patterns of HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 in the temperature range of 298-1473 K, (b) Variation of normalized cell dimensions (a, b, c, β and V) versus temperature.

Table 2 Least-squares fitting results of the normalized cell dimensions for HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5.

Phase	Normalized unit cell dimension	A	B×10^-6	C×10^-9	R²
(Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅	a/a_298K	1.0005	2.9022	-0.1681	0.9653
	b/b_298K	1.0004	7.4645	0.5550	0.9966
	c/c_298K	1.0000	8.6640	1.0249	0.9998
	β/β_298K	1.0000	-1.5659	-0.1097	0.9999
	V/V_298K	1.0013	22.6504	0.7207	0.9958

Fig. 5. The spatial contours of coefficient of thermal expansion of HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5.

Fig. 6. Schematic illustration of controlling preferred orientation if HE (Yb0.25Y0.25Lu0.25Er0.25)2SiO5 is used as a ceramic top-coat of (a) TBC on a metal substrate and (b) EBC on SiCf/SiCm substrate.

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High entropy (Yb_0.25Y_0.25Lu_0.25Er_0.25)₂SiO₅ with strong anisotropy in thermal expansion

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