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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 $\ce{CaCl2}$?

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  • $\begingroup$ 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. $\endgroup$ – MaxW Nov 15 '15 at 5:57
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A peek at the NaCl - CaCl2 phase diagram (say at FactSage) will show you that NaCl can hold quite a reasonable fraction of CaCl2 in the NaCl crystal. In contrast, CaCl2 has very limited to no solubility of NaCl.

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