How to change the melting point of a metal?

  1. How to change the melting point of a metal?

    Like example:

    Iron melting point: 1535 °C
    Sulfur melting point: 115.36 °C
    If you combine Iron and Sulfur in a airtight container and light a monster fire under it, you get a sort of a pyrite (iron disulfide (FeS2)– Melting point 1,177-1,188 °C

    Lead melting point: 327.46 °C,
    Sulfur melting point: 115.36 °C
    If you do the same procedure with lead and sulfur and get some very strange black stuff called Lead sulfide (PbS) melting point 1116.85 °C


    Can some please tell me then does something change from sulfide (S ) to disulfide (S2 ) and how can that me done?
     
  2. jcsd
  3. Astronuc

    Staff: Mentor

    The metal Fe is in a different form than a chemical compound (FeS or FeS2), and the bonds between Fe and S are very different than the metal bonds.

    Metals are alloyed with other metals in order to change melting point as well as other thermophysical and/or mechanical properties.
     
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