دورية أكاديمية
Half-Heusler phase TmNiSb under pressure: intrinsic phase separation, thermoelectric performance and structural transition
| العنوان: | Half-Heusler phase TmNiSb under pressure: intrinsic phase separation, thermoelectric performance and structural transition |
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| المؤلفون: | Kamil Ciesielski, Karol Synoradzki, Damian Szymański, Kazuki Tobita, Katarzyna Berent, Patryk Obstarczyk, Kaoru Kimura, Dariusz Kaczorowski |
| المصدر: | Scientific Reports, Vol 13, Iss 1, Pp 1-13 (2023) |
| بيانات النشر: | Nature Portfolio, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Medicine LCC:Science |
| مصطلحات موضوعية: | Medicine, Science |
| الوصف: | Abstract Half-Heusler (HH) phase TmNiSb was obtained by arc-melting combined with high-pressure high-temperature sintering in conditions: p = 5.5 GPa, $$T_{HPHT}$$ T HPHT = 20, 250, 500, 750, and 1000 $$^{\circ }$$ ∘ C. Within pressing temperatures 20–750 $$^{\circ }$$ ∘ C the samples maintained HH structure, however, we observed intrinsic phase separation. The material divided into three phases: stoichiometric TmNiSb, nickel-deficient phase TmNi $$_{1-x}$$ 1 - x Sb, and thulium-rich phase Tm(NiSb) $$_{1-y}$$ 1 - y . For TmNiSb sample sintered at 1000 $$^{\circ }$$ ∘ C, we report structural transition to LiGaGe-type structure (P $$6_3$$ 6 3 mc, a = 4.367(3) Å, c = 7.138(7) Å). Interpretation of the transition is supported by X-ray powder diffraction, electron back-scattered diffraction, ab-initio calculations of Gibbs energy and phonon dispersion relations. Electrical resistivity measured for HH samples with phase separation shown non-degenerate behavior. Obtained energy gaps for HH samples were narrow ( $$\le$$ ≤ 260 meV), while the average hole effective masses in range 0.8–2.5 $$m_e$$ m e . TmNiSb sample pressed at 750 $$^{\circ }$$ ∘ C achieved the biggest power factor among the series, 13 $$\upmu$$ μ WK $$^{-2}$$ - 2 cm $$^{-1}$$ - 1 , which proves that the intrinsic phase separation is not detrimental for the electronic transport. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2045-2322 |
| Relation: | https://doaj.org/toc/2045-2322 |
| DOI: | 10.1038/s41598-023-28110-4 |
| URL الوصول: | https://doaj.org/article/0bef4c68a9bb4224aa4b5c8bf4473456 |
| رقم الأكسشن: | edsdoj.0bef4c68a9bb4224aa4b5c8bf4473456 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 20452322 |
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| DOI: | 10.1038/s41598-023-28110-4 |