(adsbygoogle = window.adsbygoogle || []).push({}); 1. The equilibrium bond length r_{0}in ion components (or salts) can always be obtained from the tabulated values of cationic, r_{+}, and anionic radii, r_{-}, respectively as

r_{0}=r_{+}+ r_{-}

Show how on this basis, and that above (refering to the first part of the problem where i was to verify that the magdelung constants divided by the number of ions in one formula unit is constant(A/v)), the Born-Lande and Borne-Mayer equations become the Kapustinskii equations.

2. Borne-Lande equation

Borne-Mayer Equation

3. When carrying out the first part of the equation i obtained an average (A/v) value of 0.839 and i can easily derive the actual Borne equations but no matter what i try i cant get a decent answer for the derivation of the Kapustinskii equation

Any assistance would be of great appreciation.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Materials Science - Derivation of Kapustinskii equation

Can you offer guidance or do you also need help?

**Physics Forums | Science Articles, Homework Help, Discussion**