Reactive spark plasma sintering and thermoelectric properties of Nd-substituted BiCuSeO oxyselenides

JOURNAL OF ALLOYS AND COMPOUNDS

卷:785

Article

Novitskii, Andrei¹  Guelou, Gabin²  Moskovskikh, Dmitriy¹  Voronin, Andrei^1,3  Zakharova, Elena¹  Shvanskaya, Larisa⁴  Bogach, Aleksey⁵  Vasiliev, Alexander⁴  Khovaylo, Vladimir¹  Mori, Takao² 

[1] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia

[2] NIMS, Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

[3] Natl Res South Ural State Univ, Chelyabinsk 454080, Russia

[4] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[5] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia

关键词: BiCuSeO;    Oxyselenides;    Thermoelectric materials;    Spark plasma sintering;    Vacancies;    Nd doping;   

DOI  :  10.1016/j.jallcom.2019.01.183

来源: Elsevier

【 摘 要 】

Bi1-xNdxCuSeO(x = 0; 0.05; 0.10; 0.15) was fabricated by the solid-state reaction and the reactive spark plasma sintering for comparative study. It was demonstrated that BiCuSeO could be formed in-situ by the reaction between Bi2O3, Bi, Cu and Se during the densification process. The effect of Nd doping on the thermoelectric properties has been investigated. The results indicated that for both series of the samples the substitution of Bi3+ by Nd3+ resulted in the increase of charge carrier concentration mainly caused by Bi/Cu deficiencies formation with the substitution. However, the specimens obtained by reactive spark plasma sintering had lower hole concentration which may originate from the high speed of the process resulted in induced point defect and interface scattering and another phase formation mechanism leading to the smaller amount of Bi/Cu deficiencies. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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