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    When the concentration of Li+ ions is below
7 mol%, substituting Y3+ ions with Li+ ions can induce oxygen vacancy
due to charge compensation
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     for higher concentrations of Li+, the substitutional
site and the interstitial site Li+ ions coexist in the host. These
interstitial Li+ ions would induce the yttrium vacancies so there are
four different types of defects around the Er3+ ions

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