What minimum ratio is needed to avoid anion-anion contact, if closest cation-anion pairs are assumed — Solid State Chemistry Question
Question
What minimum $r^+/r^-$ ratio is needed to avoid anion-anion contact, if closest cation-anion pairs are assumed to touch?
Answer: B
💡 Solution & Explanation
To fit into a tetrahedral void without pushing the anions apart (avoiding contact), the limiting radius ratio $r_{cation}/r_{anion}$ is 0.225. Therefore, correct answer is B.
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