Calculate the Frenkel defects lattice sl es Ny for an ionic compound at its melting temperature 625 C. Where the activation energy for defect formation is 3.1 ev, the force of attraction between A*2 cation and B2 anion is 1.67 x 10 N assuming an isolated ion pair. the cation radius is 0.080 nm, the electron charge is 1.60 x 1019 C. Boltzaman cnstant is 8.62 x 10 5 eV/K and the permittivity of the vacuum is 8.85 x 10 12 c2/(N-m2). Avogadro's number is 6.022x1023 atoms/mol. -12 What is the crystal structure of that ionic compound?