Abstract
The low temperature specific heats of (Fe0.5Co0.5)72B20Si4Nb4 amorphous and crystallized alloys are measured and analyzed from 1.4 to 110 K. Specific heats can be well fitted by electronic and phonon contribution terms. It is found that the electronic contribution term in specific heat for amorphous alloy is larger than that for crystallized one, and this phenomenon has been interpreted in detail. The research shows that the electronic density of states at the Fermi level and the localized loose “rattler” atoms in oversized cage structure may make contributions to the enhancement of electronic specific heat coefficient γ, and result in a larger electronic contribution term. This study is significant for further understanding the structure–property relationship for amorphous alloys at low temperature.
Highlights
As a new kind of material, amorphous alloy is known for its promising mechanical (Yang et al 2014a, b; Dun et al 2014), magnetic (Liu et al 2014; Xiang et al 2014), and chemical (Wang et al 2012) properties compared to its corresponding crystalline counterpart, and the great differences in properties between the two states are considered to be connected with their ordered or disordered microstructure
Recent study has revealed that the short- or medium-range order exists at the atomic scale in amorphous alloy (Wang et al 2008)
Within the scope of the resolution of the X-ray diffraction (XRD), the cast alloy shows a broad diffused peak without the crystallization crystal diffraction peak. This is a characteristic for fully amorphous alloy
Summary
As a new kind of material, amorphous alloy is known for its promising mechanical (Yang et al 2014a, b; Dun et al 2014), magnetic (Liu et al 2014; Xiang et al 2014), and chemical (Wang et al 2012) properties compared to its corresponding crystalline counterpart, and the great differences in properties between the two states are considered to be connected with their ordered or disordered microstructure. Recent study has revealed that the short- or medium-range order exists at the atomic scale in amorphous alloy (Wang et al 2008). It is known that amorphous alloys can be transformed into crystallized ones by annealing, and obvious changes are induced in the microstructure, accompanied with the variation of the specific heat. For amorphous alloy, some achievements have been made recently (Blázquez et al 2008; Kroeger et al 1984; Kanomata et al 2008; Grace and Anderson 1989), it still remains a puzzle
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