A group of researchers wish to study a perovskite-type oxide that has Ca, Ba, Mo, and O as elements, which has interesting properties for the spintronics industry. The atomic weight of Ba is 137.327 g/mol; Ca 40.078 g/mol, Mo 95.96 g/mol and O 15.99 94 g/mol. Y is formed by 54.2057 wt% Ba, 7.9098 wt% Ca, 18.9387 wt% Mo and 18.9458% oxygen. Calculate the interionic energy between the O-2-Mo2 interaction knowing that the radius of oxygen is 1.4 A of Mo 0.062 nm, and the Born exponent is 10? What fraction of the ionic-covalent bond is there between Ba and O knowing that the electronegativity is 0.9 and 3.5, respectively? Experimental studies show that at 200 degrees Celsius perovskite undergoes a phase transition from a tetragonal to a cubic structure, with lattice parameter a = 5.901 A and c = 0.83929 nm for the tetragonal structure with 20 atoms per cell and for the cubic structure a = 8.3775 A with 40 atoms per cell. Determine the volume change in 2 cubic centimeters when it is heated through its phase transformation temperature.