Abstract
The method of differential scanning calorimetry (DSC) was employed to examine the crystallization process of amorphous powder of the Ni80Co20 alloy in the temperature interval from room temperature to 1000K. It is shown that the crystallization process of this alloy's powder proceeds in two stages at temperatures T1=690K and T2=790K. The relative changes in the electron density of states in the vicinity of Fermi level were determined from the changes in the slope of the thermo-electromotive force (TEMF) temperature coefficient before and after each stage of crystallization process. The obtained results show that the relative change in the electron density of states is 34.9% after the first crystallization stage and 38.9% after the second one. The changes in the specific electrical resistance of the pressed powder as a function of temperature are fully correlated with the change in the electron density of states and results of the DSC method. The observed rapid decrease in the specific electrical resistance after each crystallization stage is caused by the increase of the mean free electron path and increase in the electron density of states.
Highlights
Special attention is being paid to amorphous metal alloys (AMA) in the fields of solid state physics and advanced materials, in term of their application in electronics and electrical engineering [1,2,3,4]
Two strongly distinguished exomaxima are noticable on the thermal diagram, the first one with the peak temperature of 690 K and enthalpy of 66.73 J/g released and the second one with the peak temperature of 790 K and enthalpy of 56.03 J/g released.The differential scanning calorimetry (DSC) analysis results show that the NiCo amorphous powder crystallizes in two phases
The electron density of states in copper remained approximately constant during the heating of the powder up to 1000 K, which implies that the change of the temperature coefficient TEMS after each heating was the result of a change in the electron density of states at the Fermi level in amorphous Ni80Co20 of the thermocouple
Summary
Special attention is being paid to amorphous metal alloys (AMA) in the fields of solid state physics and advanced materials, in term of their application in electronics and electrical engineering [1,2,3,4]. Intensive examinations of kinetic properties of AMA indicate a correlation between the physical nature of the anomalous behavior of the electron state density at the Fermi level, heat capacitance, thermal conductivity and electrical resistivity, on the one hand and structural inhomogeneities in these materials, on the other.
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