Determine if each statement is true or false:
a. substitutional alloys are solid solutions, but interstitial alloys are heterogenous alloys.
b. substitutional alloys have "solute" atoms that replace "solvent" atoms in a lattice, but interstitial alloys have "solute" atoms that are in between the "solvent" atoms in a lattice.
b. the atomic radii of the atoms in a substitutional alloy are similar to each other, but in an interstitial alloy, the interstitial atoms are a lot smaller than the host lattice atoms.