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首页> 外文期刊>Physica, B. Condensed Matter >Correlation between electron state density change and the electrical resistivity and magnetic permeability changes in the nanostructured powder of the NiMo alloy
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Correlation between electron state density change and the electrical resistivity and magnetic permeability changes in the nanostructured powder of the NiMo alloy

机译：NiMo合金纳米粉末中电子态密度变化与电阻率和磁导率变化之间的关系

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摘要

The nanostructured powders of the Ni95.4Mo4.6 and Ni99Mo1 alloys (average crystallite dimensions of 14 and 21 nm) were obtained by the electrochemical deposition from ammonium solutions of nickel and molybdenum salts. The method of differential scanning calorimetry (DSC) and measurement of temperature dependence of the powder's electrical resistivity, magnetic permeability and the thermoelectromotive force were employed to examine structural changes of the powders. The nanocrystalline alloys Ni95.4Mo4.6 and Ni99Mo1 were stable up to about 460K. The thermal stabilization of the alloys takes place within the temperature interval of 460-570 K. As a result of this process, a decrease in the electrical resistivity and increases in magnetic permeability as well as electron state density in the proximity of the Fermi level are observed. The crystallization temperature depends upon the current density of powder formation. The nanocrystalline alloy Ni95.4Mo4.6 obtained at j = 70 mA cm(-2) becomes crystallized in the temperature range between 650 and 840 K, while the Ni99Mo1 alloy obtained at j = 180 mA cm(-2) crystallizes in the 580-950 K temperature interval. The electrical resistivity and magnetic permeability of the nanocrystalline alloy decreased while the alloy's electron state density near the Fermi level increased after the process of crystallization took place. The electrical resistivity decrease recorded during the structural changes was due to an increase in the electron state density in the proximity of the Fermi level, as well as to an increase in the mean free path of the conducting electrons. (c) 2007 Elsevier B.V. All rights reserved.
机译：通过从镍和钼盐的铵溶液中进行电化学沉积获得了Ni95.4Mo4.6和Ni99Mo1合金的纳米结构粉末（平均微晶尺寸为14和21 nm）。采用差示扫描量热法（DSC）和测量粉末的电阻率，磁导率和热电动势的温度依赖性来检查粉末的结构变化。纳米晶合金Ni95.4Mo4.6和Ni99Mo1在高达460K的范围内都稳定。合金的热稳定在460-570 K的温度区间内进行。作为此过程的结果，在费米能级附近电阻率降低，磁导率增加以及电子态密度增加。观测到的。结晶温度取决于粉末形成的电流密度。在j = 70 mA cm（-2）时获得的纳米晶合金Ni95.4Mo4.6在650至840 K的温度范围内结晶，而在j = 180 mA cm（-2）时获得的Ni99Mo1合金在580中结晶。温度间隔-950K。发生结晶过程后，纳米晶合金的电阻率和磁导率降低，而在费米能级附近的合金的电子态密度增加。在结构变化期间记录的电阻率降低是由于费米能级附近的电子态密度增加，以及导电电子的平均自由程增加所致。 （c）2007 Elsevier B.V.保留所有权利。

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