Publication: Modificación electroquímica de superconductores de alta temperatura
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2019-12-10
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Universidad Complutense de Madrid
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Abstract
Los materiales superconductores, en general, y los cupratos superconductores, en particular, han despertado desde su descubrimiento un gran interés en la comunidad científica. La gran versatilidad de los cupratos así como sus peculiaridades estructurales han protagonizado, y continúan haciéndolo, un gran número de líneas y trabajos de investigación en diversas áreas. La oxidación de los cupratos se lleva a cabo con el objetivo de alcanzar el estado superconductor a través del dopado de la estructura con huecos. De este modo, se genera la especie Cu3+ en los planos superconductores, causante de los fonones que permiten la asociación de los pares de Cooper. Al insertar oxígeno en la estructura, el parámetro c de la celda se acorta, generando la disminución de la distancia Cu-Oapical. Como conseguencia, el ángulo de pandeo se pliega y aumenta la distancia entre planos superconductores. Como cabe esperar, gran parte de las investigaciones acerca de cupratos superconductores se centran en la optimzación y búsqueda de procesos de oxidación que mejoren las propiedades de estos materiales. A lo largo de esta Tesis se va presentar el estudio de diversos cupratos mediante oxidación/reducción electroquímica. Este método de oxidación tan solo aparece en la bibliografía aplicado al La2CuO4. Es por tanto una parcela prácticamente sin estudiar en el campo de los cupratos superconductores...
Since its discovery, superconducting materials, in general, and cuprates, particularly, have aroused a great interest in the scientific community. The large versatility of the cuprates as well as their structural peculiarities have led, and continue to do so, a large number of research works in several areas. Cuprates oxidation is carried out in order to achieve the superconducting state by the insertion of holes in the electronic structure. Therefore, the ionic species Cu3+ is generated in the superconducting planes. This copper cation is the responsible of the phonons emergence, because of them, the association into Cooper pairs takes place. When oxygen is introduced in the structure, the c parameter of the unit cell becomes shorter, so that, the distance Cu-Oapical is shortened too. As a consequence of it, the buckling angle is folded and the intralayer distance is elongated. As expected, many research lines are focused on looking for new oxidation methods and the optimization of them. In the present work it is going to present the study of cuprates electrochemical oxidation/reduction. This oxidation method has been applied to the lanthanum cuprate in the literature. Taking the publishing works as a starting point, it is going to explore this relatively new electrochemical method...
Since its discovery, superconducting materials, in general, and cuprates, particularly, have aroused a great interest in the scientific community. The large versatility of the cuprates as well as their structural peculiarities have led, and continue to do so, a large number of research works in several areas. Cuprates oxidation is carried out in order to achieve the superconducting state by the insertion of holes in the electronic structure. Therefore, the ionic species Cu3+ is generated in the superconducting planes. This copper cation is the responsible of the phonons emergence, because of them, the association into Cooper pairs takes place. When oxygen is introduced in the structure, the c parameter of the unit cell becomes shorter, so that, the distance Cu-Oapical is shortened too. As a consequence of it, the buckling angle is folded and the intralayer distance is elongated. As expected, many research lines are focused on looking for new oxidation methods and the optimization of them. In the present work it is going to present the study of cuprates electrochemical oxidation/reduction. This oxidation method has been applied to the lanthanum cuprate in the literature. Taking the publishing works as a starting point, it is going to explore this relatively new electrochemical method...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Química Inorgánica, leída el 04/11/2019