TY - JOUR
T1 - 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)
AU - Artini, Cristina
AU - Cingolani, Alessandro
AU - Valenza, Fabrizio
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
PY - 2021/7
Y1 - 2021/7
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.
KW - A. Intermetallic compounds
KW - B. Microstructure
KW - C. X-ray diffraction
KW - D. Crystal structure
KW - D. Thermoelectrics
UR - http://www.scopus.com/inward/record.url?scp=85101318391&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85101318391&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2021.111261
DO - 10.1016/j.materresbull.2021.111261
M3 - Article
AN - SCOPUS:85101318391
VL - 139
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
M1 - 111261
ER -