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• W2004534984 abstract "A systematic computational study of gallophosphates was undertaken. First, lattice energy minimization calculations using a formal-charge shell model potential have been carried out on a series of hypothetical gallium phosphates derived from their metallogallophosphate, aluminophosphate, or aluminosilicate analogues through atomic substitution. The minimized structures show the typical features in terms of bond angles and distances as expected in zeolitic gallophosphates. Second, the crystal structures of several gallophosphates in their calcined forms have been predicted, using for each compound lattice energy minimization and an initial model derived from its as-synthesized templated form. All the modified structures thus have the same GaPO4 composition. The lattice energies of all the simulated gallophosphate structures were compared to that of GaPO4-quartz as a reference structure. Interestingly, among all predicted calcined structures, various zeolitic topologies were found. The study of the energetics of these zeotypic structures showed a linear dependence of lattice energy upon density. Strikingly, a few simulated structures showed unrealistic structural features, such as important framework distortions, often associated with the occurrence of a hexameric unit in the original as-synthesized structures. Also, those gallophosphates with structural faults were found in the upper part of the energy/density plot. To address the validity of our force field calculations in these special cases, first principles calculations were undertaken on ULM-4, chosen as a typical representative structure. Indeed, the qualitative agreement found between our results and those obtained with the nonlocal density functional theory demonstrates the robustness of our force field. Further minimizations also showed that the inclusion of polarizability is crucial for yielding results comparable with those obtained using first principles methods." @default.
• W2004534984 created "2016-06-24" @default.
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• W2004534984 date "2002-01-16" @default.
• W2004534984 modified "2023-10-17" @default.
• W2004534984 title "Framework Stability of Nanoporous Inorganic Structures upon Template Extraction and Calcination: A Theoretical Study of Gallophosphate Polymorphs" @default.
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• W2004534984 doi "https://doi.org/10.1021/ja011378f" @default.
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