# Is it possible to dope Ca ions in an NaCl crystal to produce a vacancy defect?

I was just reading about defects and doping in solids and read about the defect in ionic crystal ($\ce{NaCl}$). There were examples of $\ce{SrCl2}$. Could this also occur with $\ce{CaCl2}$?

• Absolutely. If you analyze even "pure" NaCl you'll find all sorts of trace amounts of other cations and anions. The defect is of course caused by the +2 charge on a calcium ion, whereas the lattice wants a +1 charge. Not sure about the relative size of the ions which can cause disruptions in the lattice too. – MaxW Nov 15 '15 at 5:57