Publication: Síntesis y caracterización de sistemas híbridos metal-óxidos de tierras raras con propiedades ópticas por spray pirólisis y síntesis asistida por microondas de soluciones sólidas de tierras raras
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2016-02
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2016-02-04
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Abstract
Las partículas submicrométricas basadas en tierras raras presentan un considerable interés dada su amplitud de aplicaciones, tales como catalizadores o cerámicas con propiedades ópticas, debido a sus propiedades únicas determinadas por su tamaño, composición y estructura. De acuerdo con esto, esta Tesis Doctoral se ha centrado en la síntesis de este tipo de materiales siguiendo dos rutas distintas.
En primer lugar, el trabajo experimental se ha orientado hacia el desarrollo de un nuevo tipo de materiales híbridos, y la optimización y caracterización correspondientes, Ag@Y₂O₃:Eu (9 en% Eu3⁺) de partículas fosforescentes por medio del método de Spray Pirólisis mediante la pulverización de soluciones acuosas de los correspondientes nitratos como precursores. Las muestras obtenidas, además, fueron posteriormente tratadas térmicamente desde 800 a 1200ºC/12 h bajo corriente de argón constante para evitar la oxidación de plata, estudiándose con detenimiento la influencia que ejercía el contenido en ésta sobre la estructura morfología y propiedades funcionales.
Y en segundo lugar, un nuevo método de síntesis basado en la irradiación de microondas sobre los precursores utilizados (nitratos de gadolinio y europio 1% at. Eu), fue utilizado como un nuevo tipo de ruta para producir la solución sólida sustitucional correspondiente con propiedades luminiscentes.
Sub-micronic particles based in rare earths are of considerable interest for a wide variety of applications, such as catalyst or optical ceramics, due to their unique properties determined by size, composition and structure. Agree with it, this PhD thesis has been focused in the synthesis of this kind of materials following two different routes. In first place, the experimental work has been oriented towards the development of a new type of hybrid materials, and the corresponding optimization and characterization, Ag@Y₂O₃:Eu (9 at.% Eu3⁺) phosphor particles by means of Spray Pyrolysis method from water solutions of corresponding nitrates precursors. The as-prepared samples were additionally heated from 800 to 1200ºC/12 h under constant argon flow to avoid the silver oxidation. The effect of silver concentration on particle structure, morphology and functional properties was specially evaluated. And in second place, a new synthesis method was based in the microwave irradiation over the precursors used (gadolinium and europium nitrates 1 at.% Eu) to produce the corresponding solid substitutional solution with luminescent behavior, was utilized as new kind of route to produce this kind of interesting materials.
Sub-micronic particles based in rare earths are of considerable interest for a wide variety of applications, such as catalyst or optical ceramics, due to their unique properties determined by size, composition and structure. Agree with it, this PhD thesis has been focused in the synthesis of this kind of materials following two different routes. In first place, the experimental work has been oriented towards the development of a new type of hybrid materials, and the corresponding optimization and characterization, Ag@Y₂O₃:Eu (9 at.% Eu3⁺) phosphor particles by means of Spray Pyrolysis method from water solutions of corresponding nitrates precursors. The as-prepared samples were additionally heated from 800 to 1200ºC/12 h under constant argon flow to avoid the silver oxidation. The effect of silver concentration on particle structure, morphology and functional properties was specially evaluated. And in second place, a new synthesis method was based in the microwave irradiation over the precursors used (gadolinium and europium nitrates 1 at.% Eu) to produce the corresponding solid substitutional solution with luminescent behavior, was utilized as new kind of route to produce this kind of interesting materials.
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Materiales híbridos metal-óxidos, Tierras raras, Propiedades ópticas