Qi Shen, Zeyu Zhang, Calvin de Vries, Achim Iulian Dugulan, Niels van Dijk, Ekkes Brück and Lingwei Li*,
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引用次数: 0
摘要
零热膨胀(ZTE)材料具有在不同温度下长度不变的优点,因此在现代工业中需求量很大,但在金属材料中却相对罕见。由于晶体结构、电结构和磁结构之间的耦合产生了丰富而有趣的物理性质,以铁为基础的 Laves 相备受关注。本研究通过宏观磁性测量、莫斯鲍尔光谱和 X 射线衍射,研究了单相 Fe2-xHf0.80Nb0.20 拉夫斯相合金在 4.2-400 K 温度范围内的结构、磁转变、热膨胀和磁致效应。同时,在磁场变化为 2 T 时,磁熵从 0.39 J/kg K 增加到 0.50 J/kg K。变温 X 射线衍射和莫斯鲍尔光谱法证明,这些性能的改善归因于空位引起的铁磁性和反铁磁性相共存。这项研究通过控制铁基拉维斯相合金中磁性原子位置的空位,为新型零热膨胀材料的开发开辟了一条大有可为的途径。
Zero Thermal Expansion Effect and Enhanced Magnetocaloric Effect Induced by Fe Vacancies in Fe2Hf0.80Nb0.20 Laves Phase Alloys
Zero thermal expansion (ZTE) materials with the advantage of an invariable length with varying temperatures are in high demand for modern industry but are relatively rare for metals. Fe-based Laves phases attract significant attention due to the rich and intriguing physical properties resulting from the coupling between crystal, electric, and magnetic structures. In this work, the structural, magnetic transition, thermal expansion, and magnetocaloric effect of single-phase Fe2–xHf0.80Nb0.20 Laves phase alloys were investigated by means of macroscopic magnetic measurements, Mössbauer spectroscopy, and X-ray diffraction at the temperature range of 4.2–400 K. With the introduction of Fe vacancies, the ZTE coefficient of −1.2 ppm/K is smaller than that (1.7 ppm/K) of stoichiometric Fe2Hf0.80Nb0.20 alloy. Meanwhile, the magnetic entropy change experiences an enhancement from 0.39 to 0.50 J/kg K at a magnetic field change of 2 T. These improved properties are attributed to the vacancy-induced coexistence of ferromagnetic and antiferromagnetic phases, as evidenced by variable-temperature X-ray diffraction and Mössbauer spectroscopy. This work unveils a promising avenue for new zero thermal expansion materials by controlling the vacancies at magnetic atom positions in Fe-based Laves phase alloys.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.