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.

 

[ravenprp]

To change the melting point of a metal, you can manipulate its chemical composition or physical structure. One way to do this is by alloying the metal with other elements. This changes the arrangement of atoms and can alter the melting point of the metal. For example, adding carbon to iron creates steel, which has a higher melting point than pure iron.

Another way to change the melting point is through heat treatment. By heating the metal to a specific temperature and then rapidly cooling it, you can alter its crystalline structure and potentially increase its melting point.

Additionally, you can change the melting point of a metal by applying pressure. This is known as pressure-induced polymorphism, where the application of high pressure can change the arrangement of atoms and molecules, resulting in a different melting point.

In regards to your question about changing from sulfide (S) to disulfide (S2), this can be achieved through chemical reactions. In the case of iron and sulfur, when heated together, they undergo a chemical reaction to form iron disulfide (FeS2), which has a higher melting point than pure iron or sulfur. Similarly, in the case of lead and sulfur, the chemical reaction results in the formation of lead sulfide (PbS), which also has a higher melting point than both pure lead and sulfur.