Síntesis, estructuras y propiedades magnéticas de los polimorfos de alta presión de Mn₂MsbO₆ (M=Cr, Fe y R-Tierra rara)
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2017
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19/04/2017
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Universidad Complutense de Madrid
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Abstract
Los compuestos con estructura tipo perovskita, de fórmula general ABO3 y sus polimorfos ordenados (AA'BB'O6) han sido ampliamente estudiados debido a que pueden presentar coexistencia de dos o más órdenes ferroicos. Sin embargo, los compuestos con estructuras derivadas del corindón han suscitado un menor interés a pesar de poseer la misma estequiometría ABO3/ A2BB'O6 y similar potencial como materiales multiferroicos. Además, la utilización de altas presiones permite inducir transformaciones de fase entre estos polimorfos. En este contexto, el principal objetivo de este trabajo es la síntesis, caracterización estructural y determinación de la relación estructura-propiedades en los óxidos Mn2MSbO6 (M = Cr, Fe Sc y R-tierra rara-)...
The most widely studied family of functional materials is that of perovskites, with ABO3 stoichiometry. Recently, rock-salt ordered A2BB'O6 double perovskites and more complex AA'BB'O6 compounds have shown the coexistence of two ferroic orders. Despite their similar chemical formula, ABO3 and A2BB'O6 ordered corundum derivative structures have been lees explored, though they can achieve not only ferroelectricity but also multiferroicity. High pressure can induce phase transitions from the corundum derivatives to the denser perovskite structure, thus relating two phases with potential functional interest. In this context, this study aims the synthesis and structural characterisation of Mn2MSbO6 (M = Cr, Fe and R - rare earth) oxides, along with the determination of their structure-properties relationship...
The most widely studied family of functional materials is that of perovskites, with ABO3 stoichiometry. Recently, rock-salt ordered A2BB'O6 double perovskites and more complex AA'BB'O6 compounds have shown the coexistence of two ferroic orders. Despite their similar chemical formula, ABO3 and A2BB'O6 ordered corundum derivative structures have been lees explored, though they can achieve not only ferroelectricity but also multiferroicity. High pressure can induce phase transitions from the corundum derivatives to the denser perovskite structure, thus relating two phases with potential functional interest. In this context, this study aims the synthesis and structural characterisation of Mn2MSbO6 (M = Cr, Fe and R - rare earth) oxides, along with the determination of their structure-properties relationship...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Química Inorgánica, leída el 19-04-2017