The work involved a multidisciplinary task, undertaking the study of phases of mineralogical and physico-chemical interest. Selenites were synthesised, given that they are a new field and likely to present original physical properties. Their study was carried out using crystallographic methods and the behaviour of their physical properties was investigated.
As a result of this research, twenty-four selenites of different transition metals were synthesised. These were grouped as a function of the conditions of the pressure and the temperature employed in their synthesis, differentiating three blocks of eight phases each. New polymorphs obtained were: Mn(SeO3).H2O(A,B), in low pressure and temperature conditions, Mn3(SeO3)3.H2O and Mn4(SeO3)4.H2O phases in moderate pressure and temperature conditions, and Mn(SeO3)(A,B) polymorphs in high pressure and temperature conditions.
The aims were, apart from obtaining new selenites, the undertaking of a structural analysis by means of X-ray diffraction in monocrystalline and in polycrystalline samples. The studies carried out enabled the elucidation of the crystallographical parameters for each phase. The X-ray diffraction diagrams for the polycrystalline sample showed a significant absence of impurities. Finally, the structures of twenty-four phases, obtaining the link distances, the distortion and the equilibrium of the loads of the units present, were investigated.
Irati Kortabitarte | alfa
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