Effects of spark plasma sintering on enhancing the thermoelectric performance of Hf-Ti doped VFeSb half-Heusler alloys

被引：13
作者：
El-Khouly, A. [1 ,2 ]
Adam, A. M. [3 ,4 ]
Novitskii, A. [1 ]
Ibrahim, E. M. M. [3 ]
Serhiienko, I [1 ]
Nafady, Ayman [7 ]
Kutzhanov, M. K. [1 ]
Karpenkov, D. [5 ]
Voronin, A. [1 ]
Khovaylo, V [1 ,6 ]
机构：
[1] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia
[2] Damanhour Univ, Fac Sci, Phys Dept, Damanhour 22516, Egypt
[3] Sohag Univ, Fac Sci, Phys Dept, Sohag 82524, Egypt
[4] King Salman Int Univ, Fac Engn, Sinai, Egypt
[5] Moscow MV Lomonosov State Univ, Moscow 119991, Russia
[6] Natl Res South Ural State Univ, Chelyabinsk 454080, Russia
[7] King Saud Univ, Coll Sci, Dept Chem, Riyadh 11451, Saudi Arabia
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2021年 / 150卷
基金：
俄罗斯基础研究基金会;
关键词：
Thermoelectric materials; Half-heusler alloys; Spark plasma sintering; Phonon scattering; Thermal conductivity; PHASE-RELATIONS; POROSITY;
D O I：
10.1016/j.jpcs.2020.109848
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
This work presents a study on the thermoelectric properties of ultrafine grained Hf-Ti dual-doped VFeSb half-Heusler (HH) alloys treated by spark plasma sintering (SPS) at different temperatures. The concerned alloys were successfully synthesized by arc/induction melting and mechanical alloying (MA). Thermoelectric (TE) properties of Fe(V0.8Hf0.2)(1-x)TixSb (x = 0.0, 0.2, 0.4) HH samples were studied over the temperature range from 100 to 900 K. Hf and Ti as heavy elements were used as dopants to create point defects aiming to reduce the material's thermal conductivity by enhancing the phonon scattering. Since the transport properties of HH alloys are sensitive to heat treatment, the effect of sintering temperature is studied as well. It was found that the power factor is significantly improved by increasing the sintering temperature. As a result, the figure of merit was enhanced by similar to 10% for the Fe(V0.8Hf0.2)(0.8)Ti0.2Sb sample and by similar to 30% for the Fe(V0.8Hf0.2)(0.6)Ti0.4Sb sample which were sintered at 1123 K, compared to those sintered at 1023 K. The maximum value was recorded at 0.33 for the sample Fe(V0.8Hf0.2)Sb. This value is higher than that of the singly doped FeV0.9Hf0.1Sb sample with a maximum zT value of 0.08. Also, it is higher than the reported value of the FeVSb doped with Ti which shows maximum ZT of 0.174 calculated for FeV0.7Ti0.3Sb at 658 K.
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页数：7
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