在我国的《金属学原理》教科书中[1—3],常常把间隙相与间隙化合物看作是两种不同类型的相,即当碳、氢、氮等非金属原子半径与过渡族金属原子半径之比R_X/R_M<0.59时,形成结构简单的间隙相,而当R_X/R_M>0.59时,则形成结构复杂的间隙化合物。有的学校在教学中还把以上定义作为基本概念而 In our country’s “Metallography” textbook [1-3], often the gap phase and interstitial compounds as two different types of phase, that is, when carbon, hydrogen, nitrogen and other non-metallic atomic radius and transition metal atoms When the radius ratio R_X / R_M <0.59, a simple structure gap phase is formed, whereas when R_X / R_M> 0.59, a complex structure gap compound is formed. Some schools also use the above definition as a basic concept in their teaching