Effect of Mg Content on Thermoelectric Property of Mg3(1+z)Sb2 Compounds

doi:10.15541/jim20200538

Abstract

Abstract:

Mg₃Sb₂ compound has attracted much attention due to the promising thermoelectric properties and cost advantage. However, it is quite difficult to control Mg content during synthesizing processes because of high saturation vapor pressure and chemical reactivity of Mg element. Herein, Mg₃₍₁₊_z₎Sb₂ (z=0, 0.02, 0.04, 0.06 and 0.08) samples were prepared by combination of solid state reaction, ball milling and spark plasma sintering (SPS). Their effects of Mg content on thermoelectric properties of Mg₃Sb₂ compounds were investigated in this study. Results indicate that actual Mg content rises with nominal Mg content increasing, and their point defect type changes from Mg vacancy(${{\text{{V}''}}_{\text{Mg}}}$) to interstitial Mg($\text{Mg}_{\text{i}}^{\centerdot \centerdot }$), leading to transition of transport behavior from p type (hole carriers predominated) for Mg₃₍₁₊_z₎Sb₂ (z=0, 0.02, 0.04) samples to n type (electron carriers predominated) for Mg₃₍₁₊_z₎Sb₂ (z=0.06, 0.08) samples. Besides, Mg_3(1+0.04)Sb₂ sample shows the highest ZT value from room temperature to 770 K, and achieves maximum ZT of 0.28 at 800 K. Additionally, Mg_3(1+0.04)Sb₂ sample exhibits intrinsic p-type transport behavior for Mg₃Sb₂ compound, which could serve as matrix to be extrinsically doped in the future study for further improvements of electrical properties and ZT value.

Key words: Mg content, Mg₃Sb₂ compound, carriers, thermoelectric property

CLC Number:

O472

LU Xu, HOU Jichong, ZHANG Qiang, FAN Jianfeng, CHEN Shaoping, WANG Xiaomin. Effect of Mg Content on Thermoelectric Property of Mg₃₍₁₊_z₎Sb₂ Compounds[J]. Journal of Inorganic Materials, 2021, 36(8): 835-840.

Figures/Tables 5

Fig. 1 (a) XRD patterns of Mg3(1+z)Sb2 (z=0, 0.02, 0.04, 0.06, 0.08), and (b) back scattering electron image and elemental mapping of (c) Mg, (d) Sb for Mg3(1+0.04)Sb2

Table 1 Actual compositions of Mg3(1+z)Sb2 (z=0, 0.02, 0.04, 0.06, 0.08)

Nominal composition	Actual composition
Nominal composition	Mg	Sb
Mg₃Sb₂	2.88	2.00
Mg_3.06Sb₂	2.92	2.00
Mg_3.12Sb₂	2.97	2.00
Mg_3.18Sb₂	3.02	2.00
Mg_3.24Sb₂	3.04	2.00

Fig. 2 Temperature dependent electrical transport properties of Mg3(1+z)Sb2 (z=0, 0.02, 0.04, 0.06, 0.08) (a) Electrical conductivity, σ; (b) Carrier concentration, pH(nH); (c) Hall coefficient RH; (d) Mobility, μ; (e) Seebeck coefficient, α; (f) Power factor, PF

Fig. 3 Temperature dependent thermal conductivities of Mg3(1+z)Sb2 (z=0, 0.02, 0.04, 0.06, 0.08) (a) Total thermal conductivity κ; (b) Carrier thermal conductivity κC; (c) Lattice thermal conductivity κL

Fig. 4 Temperature dependent thermoelectric figure of merit ZT of Mg3(1+z)Sb2 (z=0, 0.02, 0.04, 0.06, 0.08)

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Effect of Mg Content on Thermoelectric Property of Mg₃₍₁₊_z₎Sb₂ Compounds

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