Service Stability of Gd/Bi0.5Sb1.5Te3 Thermo-electro-magnetic Gradient Composites

doi:10.15541/jim20220637

Abstract

Abstract:

Combining thermoelectric materials with magnetocaloric materials enables a potential new all-solid-state cooling technology based on coupling enhancement of thermoelectric cooling and magnetic cooling, which is highly expected to achieve a technological change from thermoelectric cooling to thermoelectromagnetic cooling. However, the stability of thermal-electro-magnetic composites in service environment is still unknown. Herein, a series of Gd/BST thermo-electro-magnetic gradient composites were prepared by combining Bi_0.5Sb_1.5Te₃ (BST) thermoelectric material and Gd magnetocaloric material via spark plasma sintering technology. Evolution of phase composition, microstructure, thermoelectric, and cooling performance of the gradient composites during the 12 d aging process at 338 K and 80% relative humidity(RH) were systematically studied. The results show that the phase composition and microstructure of Gd/BST thermal-electro-magnetic gradient composites have excellent service stability. The chemical composition and average thickness (~4.5 μm) of Gd-Te diffusion layer at Gd/BST heterogeneous interface doesn’t exhibit obvious change during the aging process. The test of thermoelectric and cooling performance along different Gd concentration gradient indicates that ZT of the materials negligibly changed before and after aging treatment, and the cooling temperature difference of the single-leg device is stable at about 6.5 K under the threshold current of 2.5 A. These results show that thermoelectric and cooling performance of the Gd/BST gradient composites have excellent service stability.

Key words: thermo-electro-magnetic gradient composites, thermoelectric performance, cooling performance, service stability

CLC Number:

TB34

WANG Bo, YU Jian, LI Cuncheng, NIE Xiaolei, ZHU Wanting, WEI Ping, ZHAO Wenyu, ZHANG Qingjie. Service Stability of Gd/Bi_0.5Sb_1.5Te₃ Thermo-electro-magnetic Gradient Composites[J]. Journal of Inorganic Materials, 2023, 38(6): 663-670.

Figures/Tables 10

Fig. 1 Schematic diagram of the cutting positions for the structure and performance characterization of samples

Fig. 2 Schematic diagram of the electrical performance test of Gd/BST gradient composite

Fig. 3 XRD patterns of Gd/BST gradient composites with different aging time

Fig. 4 (a) Secondary electron image (SEI), (b, c) backscattered electron images (BEI) and (d) EPMA elemental mapping images of the samples after aging for 12 d

Fig. 5 Change of thickness of the diffusion layer of Gd/BST heterojunction interface with aging time

Fig. 6 EPMA element line analysis from Gd ball to BST matrix for (a, b) as-prepared sample and (c, d) sample after aging for 12 d

Fig. 7 Temperature dependence of (a) electrical conductivity and (b) Seebeck coefficient for forward (solid icon) and reverse (hollow icon) testing of Gd/BST gradient composites for different aging time with insets showing change of electrical conductivity and Seebeck coefficient with aging time at 300, 350 and 500 K

Fig. 8 Temperature dependence of (a) thermal conductivity, (b) carrier thermal conductivity, (c) lattice thermal conductivity, and (d) ZT for forward (solid icon) and reverse (hollow icon) testing of Gd/BST gradient composites with different aging time with insets showing changes of thermal conductivity, carrier thermal conductivity, lattice thermal conductivity, and ZT with aging time at 300, 350 and 500 K

Fig. 9 Cooling performance of the Gd/BST gradient composite device with different aging time under different forward currents ΔT: Difference of working temperatures; ΔTC: Difference of cooling temperatures Colorful figures are available on website

Table 1 Cooling performance of Gd/BST gradient composite device with different ageing time/K

Sample	I = 1.5 A				I=2.0 A				I=2.5 A				I=3.0 A
	I_forward		I_reverse		I_forward		I_reverse		I_forward		I_reverse		I_forward		I_reverse
	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C	ΔT	ΔT_C
t00	14.6	5.4	15.8	5.5	18.7	6.1	21.1	6.3	24.1	6.6	27.3	7.0	28.4	6.1	33.3	7.0
t04	15.6	5.4	16.6	5.7	20.1	6.3	22.2	6.2	24.6	6.8	28.3	6.7	28.8	6.7	34.9	6.5
t08	14.4	5.2	15.5	5.4	19.3	6.1	21.0	6.3	24.1	6.4	27.0	6.9	29.2	6.2	33.2	7.0
t12	15.3	5.4	15.9	5.6	19.1	6.2	21.2	6.2	23.2	6.5	26.5	6.5	27.0	6.3	31.6	6.6

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Service Stability of Gd/Bi_0.5Sb_1.5Te₃ Thermo-electro-magnetic Gradient Composites

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