Compositional Optimization and Structural Properties of the Filled Skutterudite Smy(FexNi1−x)4Sb11.5Sn0.5
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis
2.2. Scanning Electron Microscopy–Energy-Dispersive X-Ray Spectroscopy (SEM-EDS)
2.3. High Temperature Powder X-ray Diffraction
3. Results
3.1. Compositional and Morphological Characterization
3.2. Structural Characterization
4. Discussion
5. Conclusions
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- Relying on the refined Sm amounts, the p/n crossover is expected to be located at x ~ 0.53, meaning that the p-region is enlarged with respect to the Sn-free system.
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- No slope change is observed in the trend of the skutterudite cell parameter vs. x in correspondence of the p/n crossover at any considered temperature.
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- A much smaller CTE mismatch is revealed between p- and n-compositions in the present system than in the Sn-free one, which makes Smy(FexNi1−x)4Sb11.5Sn0.5 a promising thermoelectric material in terms of mechanical properties.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | Refined Composition | Additional Phases (wt.%) | Skutterudite a Cell Parameter [Å] | ||
---|---|---|---|---|---|
Fe40_303 | Sm0.22(Fe0.41Ni0.59)3.9Sb11.8Sn0.2 | Sb0.95Sn0.05 (11%) | 9.0948(1) | 18.5 | 9.39 |
Fe40_373 | 9.1023(1) | 15.0 | 9.91 | ||
Fe40_473 | 9.1128(1) | 12.5 | 10.5 | ||
Fe40_573 | 9.1245(1) | 12.7 | 9.43 | ||
Fe40_673 | 9.1370(1) | 12.1 | 11.0 | ||
Fe40_773 | 9.1487(1) | 12.8 | 9.88 | ||
Fe55_303 | Sm0.26(Fe0.55Ni0.45)3.7Sb11.5Sn0.5 | Fe0.66Ni0.33Sb2 (traces); SbSn (traces) | 9.1004(1) | 7.30 | 6.44 |
Fe55_373 | 9.1085(1) | 6.85 | 6.11 | ||
Fe55_473 | 9.1203(1) | 7.63 | 6.18 | ||
Fe55_573 | 9.1326(1) | 6.58 | 6.19 | ||
Fe55_673 | 9.1457(1) | 5.81 | 5.79 | ||
Fe55_773 | 9.1585(1) | 6.03 | 5.18 | ||
Fe60_303 | Sm0.27(Fe0.59Ni0.41)3.7Sb11.7Sn0.3 | Sb0.92Sn0.08 (9%); Fe0.66Ni0.33Sb2 (29%) | 9.1005(1) | 8.39 | 8.26 |
Fe60_373 | 9.1086(1) | 8.03 | 9.26 | ||
Fe60_473 | 9.1203(1) | 7.27 | 7.48 | ||
Fe60_573 | 9.1322(1) | 6.08 | 7.90 | ||
Fe60_673 | 9.1453(1) | 6.90 | 8.25 | ||
Fe60_773 | 9.1573(1) | 4.66 | 5.14 | ||
Fe80_303 | Sm0.61(Fe0.79Ni0.21)3.9Sb11.8Sn0.2 | Sb; FeSb2; SbSn (traces) | 9.1181(1) | -- | -- |
Fe80_373 | 9.1267(1) | -- | -- | ||
Fe80_473 | 9.1392(1) | -- | -- | ||
Fe80_573 | 9.1508(1) | -- | -- | ||
Fe80_673 | 9.1661(1) | -- | -- | ||
Fe80_773 | 9.1831(1) | -- | -- |
Sample | Equation of the Regression Line | Expected a Value at 303 K [Å] | |
---|---|---|---|
Fe41 | a = 1.1520 × 10−4 T + 9.0592 | 9.0941 | 0.999 |
Fe55 | a = 1.2370 × 10−4 T + 9.0623 | 9.0998 | 0.999 |
Fe59 | a = 1.2135 × 10−4 T + 9.0633 | 9.1001 | 0.999 |
Fe79 | a = 1.3595 × 10−4 T + 9.0756 | 9.1168 | 0.994 |
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Artini, C.; Carlini, R.; Gigli, L.; Fanciulli, C. Compositional Optimization and Structural Properties of the Filled Skutterudite Smy(FexNi1−x)4Sb11.5Sn0.5. Metals 2020, 10, 692. https://doi.org/10.3390/met10050692
Artini C, Carlini R, Gigli L, Fanciulli C. Compositional Optimization and Structural Properties of the Filled Skutterudite Smy(FexNi1−x)4Sb11.5Sn0.5. Metals. 2020; 10(5):692. https://doi.org/10.3390/met10050692
Chicago/Turabian StyleArtini, Cristina, Riccardo Carlini, Lara Gigli, and Carlo Fanciulli. 2020. "Compositional Optimization and Structural Properties of the Filled Skutterudite Smy(FexNi1−x)4Sb11.5Sn0.5" Metals 10, no. 5: 692. https://doi.org/10.3390/met10050692