Effect of the sintering pressure on structure and microstructure of the filled skutterudite Smy(FexNi1-x)4Sb12 (x = 0.50–0.80, y = 0.17–0.55)

Cristina Artini; Alessandro Cingolani; Fabrizio Valenza; Umberto Anselmi-Tamburini; Giovanna Latronico; Paolo Mele

doi:10.1016/j.materresbull.2021.111261

Effect of the sintering pressure on structure and microstructure of the filled skutterudite Sm_y(Fe_xNi_1-_x)₄Sb₁₂ (x = 0.50–0.80, y = 0.17–0.55)

Cristina Artini, Alessandro Cingolani, Fabrizio Valenza, Umberto Anselmi-Tamburini, Giovanna Latronico, Paolo Mele

Research output: Contribution to journal › Article › peer-review

Abstract

A structural and microstructural study was performed on several compositions of the Sm_y(Fe_xNi_1-_x)₄Sb₁₂ system treated at three different pressures during the spark plasma sintering (SPS) process. Aim of the study is to recognize the effect of applied pressure at a fixed temperature on composition, microstrain and domains size, due to the relevance of these parameters in driving the thermoelectric properties of the material. Increasing pressure induces a change in the Sm amount, as well as an increase in microstrain and a decrease in the diffraction domains size. At the same time, enhancing pressure above a certain threshold promotes the formation of the extra phase (Sm,Fe,Ni)Sb₂, and hence a large power factor reduction. Relying on data collected in this work, applying a pressure close to 180 MPa during SPS results to be a good compromise between advantages in terms of microstructure and transport properties, and disadvantages in terms of phase purity.

Original language	English
Article number	111261
Journal	Materials Research Bulletin
Volume	139
DOIs	https://doi.org/10.1016/j.materresbull.2021.111261
Publication status	Published - 2021 Jul

Keywords

A. Intermetallic compounds
B. Microstructure
C. X-ray diffraction
D. Crystal structure
D. Thermoelectrics

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Effect of the sintering pressure on structure and microstructure of the filled skutterudite Sm_y(Fe_xNi_1-_x)₄Sb₁₂ (x = 0.50–0.80, y = 0.17–0.55). / Artini, Cristina; Cingolani, Alessandro; Valenza, Fabrizio; Anselmi-Tamburini, Umberto; Latronico, Giovanna; Mele, Paolo.

In: Materials Research Bulletin, Vol. 139, 111261, 07.2021.

Research output: Contribution to journal › Article › peer-review

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title = "Effect of the sintering pressure on structure and microstructure of the filled skutterudite Smy(FexNi1-x)4Sb12 (x = 0.50–0.80, y = 0.17–0.55)",

abstract = "A structural and microstructural study was performed on several compositions of the Smy(FexNi1-x)4Sb12 system treated at three different pressures during the spark plasma sintering (SPS) process. Aim of the study is to recognize the effect of applied pressure at a fixed temperature on composition, microstrain and domains size, due to the relevance of these parameters in driving the thermoelectric properties of the material. Increasing pressure induces a change in the Sm amount, as well as an increase in microstrain and a decrease in the diffraction domains size. At the same time, enhancing pressure above a certain threshold promotes the formation of the extra phase (Sm,Fe,Ni)Sb2, and hence a large power factor reduction. Relying on data collected in this work, applying a pressure close to 180 MPa during SPS results to be a good compromise between advantages in terms of microstructure and transport properties, and disadvantages in terms of phase purity.",

keywords = "A. Intermetallic compounds, B. Microstructure, C. X-ray diffraction, D. Crystal structure, D. Thermoelectrics",

author = "Cristina Artini and Alessandro Cingolani and Fabrizio Valenza and Umberto Anselmi-Tamburini and Giovanna Latronico and Paolo Mele",

note = "Funding Information: S. Choi and T. Takeuchi (Toyota Technological Institute, Nagoya, Japan), and A. Baldini (University of Pavia, Italy) are kindly acknowledged for performing SPS experiments. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

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AU - Artini, Cristina

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AU - Anselmi-Tamburini, Umberto

AU - Latronico, Giovanna

AU - Mele, Paolo

N1 - Funding Information: S. Choi and T. Takeuchi (Toyota Technological Institute, Nagoya, Japan), and A. Baldini (University of Pavia, Italy) are kindly acknowledged for performing SPS experiments. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Publisher Copyright: © 2021 Elsevier Ltd Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/7

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N2 - A structural and microstructural study was performed on several compositions of the Smy(FexNi1-x)4Sb12 system treated at three different pressures during the spark plasma sintering (SPS) process. Aim of the study is to recognize the effect of applied pressure at a fixed temperature on composition, microstrain and domains size, due to the relevance of these parameters in driving the thermoelectric properties of the material. Increasing pressure induces a change in the Sm amount, as well as an increase in microstrain and a decrease in the diffraction domains size. At the same time, enhancing pressure above a certain threshold promotes the formation of the extra phase (Sm,Fe,Ni)Sb2, and hence a large power factor reduction. Relying on data collected in this work, applying a pressure close to 180 MPa during SPS results to be a good compromise between advantages in terms of microstructure and transport properties, and disadvantages in terms of phase purity.

AB - A structural and microstructural study was performed on several compositions of the Smy(FexNi1-x)4Sb12 system treated at three different pressures during the spark plasma sintering (SPS) process. Aim of the study is to recognize the effect of applied pressure at a fixed temperature on composition, microstrain and domains size, due to the relevance of these parameters in driving the thermoelectric properties of the material. Increasing pressure induces a change in the Sm amount, as well as an increase in microstrain and a decrease in the diffraction domains size. At the same time, enhancing pressure above a certain threshold promotes the formation of the extra phase (Sm,Fe,Ni)Sb2, and hence a large power factor reduction. Relying on data collected in this work, applying a pressure close to 180 MPa during SPS results to be a good compromise between advantages in terms of microstructure and transport properties, and disadvantages in terms of phase purity.

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