零热膨胀金属材料研究进展

宋玉柱, 张济民, 周畅, 施耐克, 陈骏

Research Progress on Zero Thermal Expansion Metallic Materials

SONG Yuzhu, ZHANG Jimin, ZHOU Chang, SHI Naike, CHEN Jun

图8 Ho2(Fe, Co)17的热膨胀性能以及热膨胀调控机制[34]

Fig.8 Thermal expansion properties of Ho2(Fe, Co)17 and its regulation mechanism[34] (a) volumetric thermal expansion of Ho2(Fe, Co)17 (ΔV—relative volume variation, SIV—super Invar) (b) stability of zero expansion of Ho2Fe16Co (ΔT1—100-208 K, ΔT2—208-377 K, ΔT3—377-416 K) (c, d) magnetic ordered densities of state (DOS) of Ho2Fe17 (c) and Ho2Fe15Co2 (d) (E—electronic energy level, FIM—ferrimagnetic, DLM—disordered local moment) (e) changes of Fe magnetic moment and cell volume (V) of Ho2Fe16Co at 6g (MFe/Co—magnetic moment of Fe/Co atoms, T—temperature, μB—Bohr magnetron) (f) contribution of the magnetic moment (MFe) and magnetic order of the Fe sublattice to the cell volume (VM) (VM(T)—contribution of magnetic ordering to the unit cell volume, |Σ MFe|—magnetic moment of Fe sublattice. Inset in Fig.8f shows the |Σ MFe| as a function of Co content)