A Kagome Metallic Composite Realizes Mechanically Axial Zero Thermal Expansion up to 800 K.
basic_science · Level V
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- Record sourced from PubMed, PMID 40401385.
- Also identified by DOI 10.1002/adma.202502030.
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Abstract
Manipulating the crystal structure and microstructure is fundamentally paramount for designing advanced materials with enhanced functionalities. Kagome-lattice metals attracted considerable attention due to desirable electronic and magnetic properties but are rarely considered for application as structural materials. In this study, a concept of kagome composite is proposed to realize mechanically zero thermal expansion (ZTE) alloy over a wide temperature window, exemplified by the Lu-Fe-Co ternary alloys prepared by two-step synthesis. Using magnetic Co doping, the kagome lattice magnetic order is stabilized in the parent hexagonal Lu<sub>2</sub>Fe<sub>17</sub> structure, and its thermal expansion regulated simultaneously. By in situ precipitation of the α-(Fe/Co) phase in the matrix, a soft/hard heterogeneous structure emerges and an ultra-wide temperature window axial ZTE composite (α<sub>l</sub> = +0.98 × 10<sup>-6</sup> K<sup>-1</sup>, 110-800 K) with good compressive strength (1.11 GPa) is achieved. This work opens up the prospect of kagome intermetallic composite in the integration of structure and function.