Seebeck coefficient variations of α-MgAgSb in crystalline Mg-Ag-Sb thin films

被引：4

作者：

Oueldna, Nouredine ^{[1
,2
]}

Portavoce, Alain ^{[1
]}

Bertoglio, Maxime ^{[1
]}

Descoins, Marion ^{[1
]}

Kammouni, Abdelkhalek ^{[2
]}

Hoummada, Khalid ^{[1
]}

机构：

[1] Aix Marseille Univ, Fac Sci St Jerome Case 142, CNRS, IM2NP, F-13397 Marseille, France

[2] Univ Moulay Ismail, Fac Sci, LASMAR, Meknes 11201, Morocco

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 932卷

关键词：

-MgAgSb; Effective Seebeck coefficient; Thin films; Secondary phases; Thermoelectricity; HIGH THERMOELECTRIC PERFORMANCE; X-RAY-DIFFRACTION; WASTE HEAT; POWER; PSEUDOPOTENTIALS; GENERATOR; ANTIMONY;

D O I：

10.1016/j.jallcom.2022.167692

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

alpha-MgAgSb is a thermoelectric material exhibiting promising performances at room temperature, and thus, attracting wide attention for low-grade heat conversion. However, large variations of its Seebeck coefficient were reported by different authors. These variations were recently suggested to be related to the possible variation of alpha-MgAgSb stoichiometry. In this work, the Seebeck coefficient of alpha-MgAgSb was measured in Mg-Ag-Sb thin films deposited by magnetron sputtering and crystallized in situ or ex situ, considering the film microstructure as well as the experimental Seebeck coefficient of the additional secondary phases present in the films. Mg-Ag-Sb films with two different compositions were investigated: the Sb-rich solid solution MgAgSb1.12 and the Ag-poor solid solution MgAg0.17Sb. The Seebeck coefficient of alpha-MgAgSb is found to be independent of the phase proportions in the Mg-Ag-Sb films. However, alpha-MgAgSb displays different Seebeck coefficients in the films MgAgSb1.12 and MgAg0.17Sb, a lack of Ag leading to a significant decrease of the alpha-MgAgSb Seebeck coefficient. These results support alpha-MgAgSb stoichiometry variations leading to significant variations of the Seebeck coefficient. The present work gives new insights about alpha-MgAgSb thin films and provides a solid support for future improvement.(c) 2022 Elsevier B.V. All rights reserved.

引用

页数：8

共 54 条

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