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在价值平衡/不平衡Mg_1-VNiSb中实现兼容的p/n型半海斯勒组合

Kazuki Imasato^1,2, Hidetoshi Miyazaki³, Philipp Sauerschnig¹

¹Global Zero Emission Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan.

ACS applied materials & interfaces

|February 26, 2024

概括

研究人员通过改变Mg:V比率在Mg1-VNiSb中,在半Heusler (HH) 材料中实现了p型到n型的过渡. 这项工作表明,从类似的母组合中开发高性能热电模块是一个有前途的战略.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
无机化学无机化学

背景情况:

半斯勒 (HH) 化合物在热电研究中具有重要意义,因为它们具有能量转化潜力.
开发具有兼容热膨胀的p型和n型热电材料对于制造高效的热电模块至关重要.
传统高温材料的高热导率一直是限制其性能的一个持续挑战.

研究的目的:

通过调整 Mg:V 化学比来证明在价值平衡/不平衡 HH 组合中的 p 型到 n 型过渡.
研究Ti-doped Mg_1-xV_xNiSb的热电特性,重点关注Seebeck系数,功率因子和导热率.
探索这些高温材料在制造功能热电模块方面的潜力.

主要方法:

合成的Mg_1-xV_xNiSb化合物具有不同的Mg:V比率,以实现p型到n型转换.
描述了Ti-doped Mg_0.57V_0.33Ti_0.1NiSb.的热电特性,包括Seebeck系数和功率因子.
测量了合成的n型HHH组合物的晶格导热率 (κ_L).

主要成果:

通过调整Mg:V比率,成功证明了Mg_1-xV_xNiSb中的p型到n型转换.
在400K的Ti-doped Mg_0.57V_0.33Ti_0.1NiSb.中,获得了130μV K^{-1的Seebeck系数和0.4mW m^-1K^{-2的功率系数.}}
与传统的高温材料相比,n型组合的报道显著降低了晶格导热率 (κ_L <2.5 W m^-1 K^-1 在300 K) .
制造了一个热电模块,在 390 K 的温度差异下,最大输出功率 (P_max) 约为 63 mW.

结论:

低晶格导热率的p型和n型Mg_1-xV_xNiSb组合物的合成为高性能热电材料提供了一个有前途的战略.
从相似的母组合中获得p型和n型材料,便于制造高效的热电模块.
探索价值平衡/不平衡四分制HH组合物的组合空间,有利于推进热电器件的开发.

关键词:

合金合金是一种合金.一半的豪斯勒.p-n 过渡时间导热率导热率导热率导热率导热率导热率热电学热电学热电学

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