镍的线热膨胀分析和磁性电子的键合作用
来源期刊：中南大学学报(自然科学版)1986年第1期
论文作者：马柳莺 谢佑卿
文章页码：19 - 28
关键词：镍； 热膨胀； 键合作用； 磁电子； 膨胀系数； 键距
Key words：nickel； thermal expansion； bonding act； magnetic electron； expansion coefficient； bond length equation.
摘 要：为了解释Ni的线热膨胀系数随温度变化的复杂关系,本文首先对Pauling的键距公式作出磁性电子作用的修正,进而导出了Ni的线热膨胀系数的关系式,式中包括两项:正常线热膨胀系数αn,磁性转变线热膨胀系数αm。并介绍了αm的计算方法,不仅计算值与实验值相当吻合,而且定量地揭示了Ni中磁性电子具有弱的共价电子的行为。随着温度升高,磁性电子的键合作用减弱,以至最后消失。
Abstract: The ferromagnetism is associated with a non-bonding group of electrons as in Pauling’s theory of metals. In order to explain the variation of the linear thermal expansion of nickel with temperature, the modification of bonding effect of magnetic electron in Pauling’s bond length equation has been made in the present work. The equation of linear thermal expansion of nickel which is derived from Pauling’s bond equation, contains two terms: normal expansivity αn and magnetic expansivity α_m due to magnetic transformation. The method of calculating αm has been presented. We have not only obtained the theoretical αn and αm values which are in general agreement with experimental values, but also discovered the weak bonding act of magnetic electron quantitatively. The bonding act becomes smaller as the temperature rises and disappears above the Curie point gradually.
