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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: orgo814 on February 26, 2013, 12:29:23 AM

Title: radius ratio
Post by: orgo814 on February 26, 2013, 12:29:23 AM

question: the radio ratio for cations and anions just touching eachother when a cation is present within an octahedral hole formed by anions is 0.414. derive the radius ratio for a cation present within a tetrahedral hole formed by anions.

I have seriously no idea how to go about solving this problem. I drew out the structure and uses pythagoreans theorem and it came down to cos45 = 2radius of anion/2 radius of cation + 2 radius of anion. I don't think I even did it right though.

Title: Re: radius ratio
Post by: Schrödinger on March 01, 2013, 03:25:48 AM

Can you use Latex and show us exactly what your Right Hand Side looks like? Is the denominator (2radius of cation + 2 radius of anion), or just 2radius of cation?

Title: Re: radius ratio
Post by: AWK on March 01, 2013, 04:18:55 AM

http://www.science.uwaterloo.ca/~cchieh/cact/c123/tetrahed.html