Formation of Interstitial Compounds and Alloy

 

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 Formation of Interstitial Compounds-

     ·      interstitial compounds are those which are formed when small atoms like H, C, N, B etc are trapped inside the crystal lattice of metals

      ·       The general characteristic physical and chemical properties of these compounds are:

        a).  High melting points which are higher than those of pure metals.

        b) Retain metallic conductivity i.e. of pure metals.

        c). Very hard and some borides have hardness as that of diamond.

        d). Chemically inert.

Alloy Formation –

     ·     transition elements form alloy because of similar in atomic size and other characteristics of transition metal

     ·      Alloys are hard and having high melting point.

             e.g., Brass- (Cu + Zn) 

                     Bronze -(Cu + Sn) etc.

       Hg when mix with other metals form semisolid amalgam except Fe, Co, Ni, Li.