轻锕系金属的价键特征及其熔点递变反常现象

CHARACf ERISTIC OF METALLIC BOND AND ANOMALY OF MELTING POINT IN THE EARLY ACTINIDE METALS

本文叙述了轻锕系金属的价键特征,指出在该金属的价带中仅有少部分5f轨道重叠,晶格中的金属键是不等价的。5f键是一种强键,但5f电子对金属熔点的贡献是很小的,由此导致该系金属熔点递变出现反常现象。

The characteristic of valence bond in the metals of early actinide was described in this paper. It indicates that partly 5f orbital overlapping in the valence band results in non-equivalence of the metallic bond.5f bond is strong, however, the distributiqn of 5f electrons is small to the melting point of actiaide metals, and so there occurs the anomaly of decrease in M. P. with increase in atomic number in the early actinide metals.