I Classification primary or terminal o substitutional must be disordered solid solution ordered intermediate or secondary interstitial disordered ionic- Pauling's rule normal valence compounds disordered -:(8-N) rule ele lectron rB (intermediate phase) sImple 0.59 interstitial complex ≥0.59 island size chain laves phases silicates apologY ical o phases frame lass metal glass amorphous glass ceramICS ceramic glass◆ Ⅱ.Classification: solid solution compounds (intermediate phase) substitutional ~ interstitial ~ primary ~ or terminal ~ ( it must be disordered ) intermediate ~ or secondary ~ ordered ~ disordered ~ normal valence ~ electron ~ size ~ ionic ~: Pauling's rule disordered ~: (8-N) rule interstitial ~ topological ~ simple ~ complex ~ laves phases δ phases silicates island chain sheet frame amorphous glass metal glass glass ceramics ceramic glass  0.59 A B r r  0.59 A B r r