Question

What do we mean by radius ratio?

• A. Ratio of coordination number to radius of $Z_{eff}$
• B. Ratio of radius of anion to radius of cation.
• C. Ratio of radius of cation to radius of anion.
• D. Ratio of $Z_{eff}$ to coordination number.

Answer 1

The correct option is C

Ratio of radius of cation to radius of anion.

We define radius ratio as the ratio of radius of the cation to the radius of the anion. This ratio is very useful for determining the coordination number and the types of voids present in a given crystal.