Interstitial alloys are a type of metallic alloy where the atoms of one element fill in the gaps or interstices between the atoms of another.
Interstitial Compound: A compound formed when an atom with a small enough radius sits in an interstice (gap) of another crystal lattice.
Metallic Bonding: The electrostatic attraction between positively charged ions and delocalized electrons in metals.
A 3D arrangement of particles (atoms, ions, or molecules) in metals and many minerals.