Metal deficiency defect is shown by \( \mathrm{Fe}_{0.93} \mathrm{O} \). In the crystal, some \(...

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Metal deficiency defect is shown by \( \mathrm{Fe}_{0.93} \mathrm{O} \). In the crystal, some \( \mathrm{Fe}^{2+} \) cations are missing and loss of positive charge is compensated by the presence of \( \mathrm{Fe}^{3+} \) ions. The percentage of \( \mathrm{Fe}^{2+} \) ions in the \( \mathrm{Fe}_{0.93} \mathrm{O} \) crystal is . (Nearest integer)
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