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Now we will learn how these normal and inverse spinels can be made This can be explained by the variation in crystal field stabilization energy of two arrangements. In the normal spinel, Like in AB2O4 type complexes it should be noted that stotiometry of the compounds suggests that one of the cation will be in +2 oxidation state (say A) and other two cations will be in +3 oxidation state (say B). In the normal spinels, cation A occupying all the tetrahedral sites and cation B occupying all the octahedral sites. Whereas in inverse spinels, cation B occupying all the tetrahedral sites and half of the octahedral voids are occupied by cation A and cation B. In general if the sum of the ligand field stabilization energies for (A2+)tet(B3+)oct is greater than those for (B3+)tet(A2+)oct, then the normal spinel structure will be adopted And if the sum of the ligand field stabilization energies for (B3+)tet(A2+)oct is greater than (A2+)tet(B3+)oct then the Inverse spinel structure will be adopted.
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