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In this work we illustrate how the tight binding formalism can beused to accurately compute formation energies in multicomponent o xides. The large and complex unit cells of these systems make the application of precise ab initio LDA techniques very computer time demanding. Consequently, simpler but less accurate methods, such as potential models, are usually used but at the expense of obtaining just qualitatively correct results. In addition, many ad hoc assumptions have to be taken indoi:10.1103/physrevb.54.805 pmid:9985345 fatcat:6wn5l5vb25evtk6xokqfp36fxy