Electron compound

Japanese: electron compound(英語表記)electroncompound
Electron compound

...There are also complex carbides such as Cr 23 C 6 and Mn 23 C 6 . (3) Electron compound. An intermediate phase recognized by W. Hume-Rothery and others around 1926, it is a compound that appears when the ratio of the sum of the valence electrons of the alloy (counted as 0 for Fe, Co, and Ni, 1 for Cu, Ag, and Au, 2 for Mg, Zn, and Be, 3 for Al, and 4 for Sn and Si) to the number of atoms is a certain ratio such as 3/2, 21/13, or 7/4 (Hume-Rothery rule). ...

*Some of the terminology that refers to "electron compound" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…炭化物のなかにはCr23C6,Mn23C6,といった複雑なものも存在する。(3)電子化合物electron compound。1926年ころにヒューム・ロザリーW.Hume‐Rotheryらによって認められた中間相で,合金の価電子数(Fe,Co,Niでは0,Cu,Ag,Auでは1,Mg,Zn,Beでは2,Alでは3,Sn,Siでは4と数える)の和と原子数の比が3/2,21/13,7/4のような一定の比をとるところで出現する(ヒューム=ロザリーの規則)化合物である。…

※「electron compound」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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