First, thanks 清華 葉均蔚 教授 's 完美講義.
Solid Solutions-Solvent - 1) Substitutional Solid Solutions 2) Interstitial Solid Solution
Cp 9.3 Interstitial Solid Solutions
It only happened at r<0.59R , C,N,O,H are major interstitial elements
but, how about our impurity or useful stuff within our blood? O2 is very useful to our bodies. However, C and N are not good thing. Remember, in fab, there is always happened, somebody use wrong N2 mask instead of O2. How many peopld dead when taking shower in winter?