Abstract
The NaZn13-type La(Fe,Si)13-based compounds with Mn doping were synthesized, and the thermal expansion and magnetic properties were investigated. Results indicate that the negative thermal expansion temperature-window shifts toward lower temperatures, which is due to the decrease of Curie temperature (Tc) by increasing the amount of Mn element, whereas the average CTE around Tc changes slightly with the increase of Mn content in the LaFe11.5−xMnxSi1.5 compounds. Such optimization of Mn element in the La(Fe,Mn,Si)13 compounds with noteworthy negative thermal expansion properties at lower temperatures promotes their potential applications for cryogenic equipment and precise instruments.
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