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Structure, Magnetism, and Tunable Negative Thermal Expansion in (Hf,Nb)Fe2 Alloys


A minute shape change, caused by the normal thermal expansion on heating, may degrade the excellent performance of materials. Consequently, it is necessary to explore negative thermal expansion (NTE) compounds to compensate positive thermal expansion (PTE) of most materials.(1, 2) Up to now, great progress has been achieved in the development of new NTE compounds, such as cyanides,(3, 4) oxides,(5-8) nitrides,(9, 10) fluorides,(11, 12) alloys.(13-15) It has be well-known that alloys have relatively better performance, not only in mechanical property but also in thermal and electron conductivity properties. Therefore, it is meaningful to extend the scope of NTE alloy families. So far, there have some alloys have been discovered to exhibit abnormal thermal expansion, such as Invar alloys of Fe0.65Ni0.35,(16, 17) Th2Zn17-type compounds of R2Fe17 (R = rare earth elements, Y, Pr, Dy, Ho, Er, Tm) and R2Fe17Cx compounds with R = Y, Tb, Tm,(18-20) NaZn13-type intermetallic of La(Fe,Si)13,(21) and MnCoGe-based compounds.(22)

Chem. Mater. 29 , 7078 (2017)