* Availability: Nickel was readily available and relatively inexpensive compared to other materials. This was important for early experiments, as resources were limited.
* Ease of preparation: Nickel can be easily prepared as a single crystal, which is crucial for the experiment to work. This is because the experiment relies on the diffraction pattern of electrons, which is only possible if the surface is perfectly smooth and ordered.
* Physical properties: Nickel has a relatively high melting point, which means that it can withstand the heat generated during the experiment without melting. It is also a good conductor of heat, which helps to dissipate heat evenly throughout the crystal.
* Chemical properties: Nickel is relatively unreactive and doesn't oxidize easily, which is important for maintaining the surface of the crystal clean.
* Diffraction pattern: The crystal structure of nickel (face-centered cubic) is conducive to producing a clear diffraction pattern.
While other materials could have been used, nickel provided a combination of desirable properties that made it an ideal choice for the experiment.
