How to change the melting point of a metal?

[Jacquesl]

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?

 

[Astronuc]

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.