Suppose that CaO is present as an impurity to Li 2 O. The Ca 2+ ion substitutes

Question

Suppose that CaO is present as an impurity to Li2O. The Ca2+ ion substitutes for Li+ ion(s). Identify the acceptable accompanying defects. (Select all that apply.)

No additional defects are required.

One O2- vacancy for every two Ca2+ impurities.

One O2- interstitial for every two Ca2+ impurities.

One Li+ vacancy for every Ca2+ impurity.

One Li+ interstitial for every Ca2+ impurity.

One O2- vacancy for every Ca2+ impurity.

Two Li+ vacancies for every Ca2+ impurity.

No additional defects are required.

One O2- vacancy for every two Ca2+ impurities.

One O2- interstitial for every two Ca2+ impurities.

One Li+ vacancy for every Ca2+ impurity.

One Li+ interstitial for every Ca2+ impurity.

One O2- vacancy for every Ca2+ impurity.

Two Li+ vacancies for every Ca2+ impurity.

Explanation / Answer

Solution :

Lithium vacancies would be created when ca2+ substitutes Li+ ion .

So for every Ca2+ ion added single lithium vacancy is created. this happens to maintain charge neutrality.

Correct option is the fouth option.

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