Examinando por Autor "Manghi, E. M."
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Ítem Acceso Abierto A comparison between gel grown and solution grown crystals - case of ADP and KDP(1982) Lefaucheux, F.; Robert, M. C.; Manghi, E. M.Water soluble crystals such as ADP and KDP have been grown in TMS gels by different techniques. A study of growth defects by X-ray topography shows that these gel grown crystals obtained by a very simple technique can be compared to crystals grown from solutions using elaborated systems.Ítem Acceso Abierto Optical properties of p-Dichlorobenzene(International Union of Crystallography, 1967) Manghi, E. M.; Caroni, C. A. de; Rodriguez de Benyacar, M.; Jimenez de Abeledo, M.The optical properties of two polymorphic forms of p-dichlorobenzene have been determined, and a correlation between those properties and the known crystal structures established. From the valúes of the principal polarizabilities for the p-dichlorobenzene molecule, and taking into account the orientation of the molecule in the crystal cell, the refractive Índices a, fi, y, have been calculated for both crystal forms, and their valúes compared with those measured experimentally. An interpretation of the magnitude and sign of the birefringence is offered. The calculated valúes of the extinction angles and the orientation of the indicatrix agree with the experimental results.