Recently, Li Laifeng, a researcher at the Key Laboratory of Cryogenic Engineering of the Institute of Physics and Chemistry, Chinese Academy of Sciences, and a research team led by Huang Rongjin, a researcher, have taken the lead in carrying out research on the negative thermal expansion properties of NaZn13 LaFeSi-based compounds. Through the composition and structure design of LaFeSi-based compounds, they succeeded in developing novel negative thermal expansion materials with negative thermal expansion coefficients and negative thermal expansion temperature regions that can be adjusted by changing the compositional elements. For example, the composition of LaFe10.5Co1.0Si1.5 has a thermal expansion coefficient of -26.1×10-6K-1 in the 240-350K temperature range.
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