Co掺杂引起的双相ZrFe0.5Ni0.5Sb双半赫斯勒和ZrNiSb半赫斯勒的热电和磁性能,ACS Applied Electronic Materials

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Co掺杂引起的双相ZrFe0.5Ni0.5Sb双半赫斯勒和ZrNiSb半赫斯勒的热电和磁性能
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2024-03-06 , DOI: 10.1021/acsaelm.3c01749
Joseph Ngugi Kahiu ₁ , Samuel Kimani Kihoi ₁ , Hyunji Kim ₁ , Ho Seong Lee ₁

Affiliation

提高即将推出的热电 (TE) 材料的效率并探索其在各种利基应用中的潜力是应对阻碍传统 TE 材料商业化的挑战的有前途的策略之一。这项工作报告了通过钴 (Co) 掺杂来提高最近优化的 ZrFe _0.4 Ni _0.6 Sb 双半赫斯勒 (DhH)性能的努力结果。合成的 ZrFe _{0.4– y} Co _y Ni _0.6 Sb 样品表现出相分离成相干双相 DhH 和 ZrNiSb 相，电导率大大提高，从样品y = 0 中的~400 S/cm 增加到样品y中的~3886 S/cm = 0.4（室温）。除了抑制双极传导外，与样品y = 0相比，样品 y = 0.1的热导率也降低了约 18% ，这可归因于声子散射的增强，并导致峰值 zT 从 0.33 增加973 K 时，样品y = 0.1 的样品y = 0 至 0.37。不幸的是，较高的掺杂浓度不仅会降低塞贝克系数，还会过度增加电子和晶格热导率，导致样品y > 0.1 的 zT 值较低。通过合成和分析 (ZrFe _0.4 Ni _0.6 NiSb) _{1– z} + (ZrNiSb) _z样品，证实 ZrNiSb 相是造成y > 0.1 样品中令人震惊的 TE 性能的原因。使用最近重构的单抛物线模型进行的进一步研究表明，ZrFe _0.4 Ni _0.6 NiSb 体系在 Co 掺杂之前就已经过度掺杂，这解释了导致 PF 降低的原因。最后，通过使用振动样品磁力计研究合成样品的磁性，揭示了合成样品的铁磁性质和可调磁性，扩大了它们在自旋电子学中的潜在利基应用范围。

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Thermoelectric and Magnetic Properties of Biphasic ZrFe0.5Ni0.5Sb Double Half-Heusler and ZrNiSb Half-Heusler Induced by Co Doping

Improving the efficiency of upcoming thermoelectric (TE) materials and exploring their potential for various niche applications are among the promising strategies for addressing the challenges that impede the commercialization of traditional TE materials. This work reports the results of efforts to improve the performance of the recently optimized ZrFe_0.4Ni_0.6Sb double half-Heusler (DhH) by cobalt (Co) doping. The synthesized ZrFe_0.4–yCo_yNi_0.6Sb samples exhibit phase separation into coherent biphasic DhH and ZrNiSb phases with greatly improved electrical conductivity, which increases from ∼400 S/cm in sample y = 0 to ∼3886 S/cm in sample y = 0.4 at room temperature. In addition to the suppression of bipolar conduction, the thermal conductivity also decreases by ∼18% in sample y = 0.1 compared to sample y = 0, which can be attributed to the enhanced phonon scattering and leads to an increase in peak zT from 0.33 in sample y = 0 to 0.37 in sample y = 0.1 at 973 K. Unfortunately, higher doping concentrations not only deteriorate the Seebeck coefficient but also excessively increase the electronic and lattice thermal conductivities, leading to lower zT values in the samples y > 0.1. By synthesizing and analyzing the (ZrFe_0.4Ni_0.6NiSb)_1–z + (ZrNiSb)_z samples, it is confirmed that the ZrNiSb phases are responsible for the appalling TE performance in the y > 0.1 samples. Further investigation using the recently restructured single parabolic model shows that the ZrFe_0.4Ni_0.6NiSb system was already overdoped before Co doping, which explains the reason for the resulting PF decrease. Finally, the ferromagnetic nature and tunable magnetism of the synthesized samples are revealed by using a vibrating sample magnetometer to study their magnetism, expanding their range of potential niche applications in spintronics.

更新日期：2024-03-06

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