dan Ismunandar., 2006, Penentuan Energi Kisi Oksida-oksida Piroklor, JMS FMIPA. West, A.R., 1998, Basic Solid State Chemistry, 2 nd ed, Plenum Press, New York. Weller, M.T., 1994, Inorganic Material Chemistry, Oxford Science Publication, Oxford. The obtained structural parameters also agreed well with those obtained from X-ray diffraction studies. Molecular simulation method has also been carried out to determine lattice energy and the obtained results were compared with those obtained from simple lattice energy equation, good agreement were obtained in these two oxides series. The simple equation describing the best plot wasU perovskite oxide = kJ/mol. Thus the obtained best fit was U(BHC) vs. Plots of Born-Haber lattice energies (U(BHC)) vs. Lattice energy of perovskite oxides were calculated using Glasser, (G), Glasser-Jenkins, (GJ), and Yoder-Flora, (YF) equations. These ionic terner compounds adopt space group Pbnm or R-3c. The perovskite oxides used on this study were rare-earth orthoferite (LnFeO 3) and aluminate (LnAlO 3). The objective this work are twofold, firstly to determine lattice energy of perovskite oxide using an approximate equation and compare lattice energy from the resulted simple equation and molecular simulation results. Determination of lattice energy, U, is an important work for ionic compounds, due to it is the driving force in the compounds formation.
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