Caracterização de filmes finos de YBa2Cu3O7-x e La0.7Ca0.3MnO3 produzidos via síntese química
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Data
2007-03-09
Autores
Santos, Cássio Morilla dos [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho teve como objetivos a preparação e caracterização de filmes finos de YBa2Cu3O.7-x e La0.7Ca0.3MnO3 depositados sobre substratos de níquel metálico, silício, e substratos cerâmicos de MgO, SrTiO.3. As análises realizadas tiveram como objetivos o estudo da formação da fase, e a determinação do comportamento de condução elétrica e das propriedades magnéticas dos filmes finos. Nas deposições realizadas sobre substratos de níquel foi utilizada uma camada intermediária de Y.2O.3, para posterior deposição de YBa.2Cu.3O.7-x. As soluções precursoras dos filmes foram obtidas através do método dos precursores poliméricos, com a inclusão do ácido etilenodiaminotetraacético (EDTA) como agente complexante. As deposições ocorreram através da técnica Spin-Coating. As análises realizadas através da Espectroscopia de Fotoelétrons de Raios X (XPS) e Difração de Raios X (XRD) auxiliaram, na identificação dos elementos químicos presentes nos filmes finos, e a verificação da formação das fases cristalográficas desejadas. Estas técnicas permitiram comprovar a eficácia da camada intermediária (buffer layer) de Y.2O.3 utilizada para a deposição de YBa.2Cu.3O.7-x sobre substratos de níquel metálico, e comprovar a necessidade de uma camada buffer layer para a obtenção de filmes de YBa.2Cu.3O.7-x depositado sobre substrato de silício. Assim como na deposição realizada sobre substrato de níquel, foi verificada também a boa formação das fases desejadas sobre os substratos cerâmicos. As análises de condução elétrica e das propriedades magnéticas demonstraram a característica supercondutora dos filmes de YBa.2Cu.3.O.7-x depositados sobre substratos de níquel metálico, MgO e SrTiOI.3, e...
This paper aimed at preparing and characterizing YBa2Cu3O.7-x e La0.7Ca0.3MnO3 and thin films, deposited on metallic nickel substrates, silicon and MgO, SrTiO.3 and LaAIO.3 ceramic substrates. The analyses performed had as objectives to study the phase formation and to determine the electric conduction behavior and the magnetic properties of the thin films. In the depositions perfomed on nickel substrates, a YBa.2Cu.3O.7-x deposition. The precursory solutions of the films were obtained by means of the polymeric precursor method, with the inclusion of the ethylenediaminotetra acetic acid (EDTA), as complexant agent. The depositions occurred through the Spin-coating technique. The analyses performed by means of the X-ray Photoelectron Spectroscopy (XPS) and X-ray Diffraction (XRD) aided in the identification of the chemical elements present in the thin films and in the verification of the formation of the desired crystallographic phases. Such techniques allowed for confirming the Y.2O.3 buffer layer efficacy, utilized to the YBa.2Cu.3O.7-x deposition on metallic nickel substrates, and for confirming the need of a buffer layer in order to obtain the YBa.2Cu.3O.7-x films deposited on the silicon substrate. As in the deposition performed on the nickel substrate, it was also verified the good formation of the desired phases on the ceramic substrates. The analyses on electrical conduction and magnetic properties demonstrated the superconducting characteristic of the YBa.2Cu.3O.7-x films deposited on metallic nickel substrates, MgO and SrTiO.3, as well as the magnetic characteristic of the La.0.7Ca.0.3MNO.3 film deposited on the silicon substrate. The analyses performed by means of Scanning Electron Microscopy (SEM) showed a better ...(Complete abstract, click electronic address below)
This paper aimed at preparing and characterizing YBa2Cu3O.7-x e La0.7Ca0.3MnO3 and thin films, deposited on metallic nickel substrates, silicon and MgO, SrTiO.3 and LaAIO.3 ceramic substrates. The analyses performed had as objectives to study the phase formation and to determine the electric conduction behavior and the magnetic properties of the thin films. In the depositions perfomed on nickel substrates, a YBa.2Cu.3O.7-x deposition. The precursory solutions of the films were obtained by means of the polymeric precursor method, with the inclusion of the ethylenediaminotetra acetic acid (EDTA), as complexant agent. The depositions occurred through the Spin-coating technique. The analyses performed by means of the X-ray Photoelectron Spectroscopy (XPS) and X-ray Diffraction (XRD) aided in the identification of the chemical elements present in the thin films and in the verification of the formation of the desired crystallographic phases. Such techniques allowed for confirming the Y.2O.3 buffer layer efficacy, utilized to the YBa.2Cu.3O.7-x deposition on metallic nickel substrates, and for confirming the need of a buffer layer in order to obtain the YBa.2Cu.3O.7-x films deposited on the silicon substrate. As in the deposition performed on the nickel substrate, it was also verified the good formation of the desired phases on the ceramic substrates. The analyses on electrical conduction and magnetic properties demonstrated the superconducting characteristic of the YBa.2Cu.3O.7-x films deposited on metallic nickel substrates, MgO and SrTiO.3, as well as the magnetic characteristic of the La.0.7Ca.0.3MNO.3 film deposited on the silicon substrate. The analyses performed by means of Scanning Electron Microscopy (SEM) showed a better ...(Complete abstract, click electronic address below)
Descrição
Palavras-chave
Filmes finos, Precursores poliméricos - Método, Spin-coating, Thin films, Polymeric precursors - Method
Como citar
SANTOS, Cássio Morilla dos. Caracterização de filmes finos de YBa2Cu3O7-x e La0.7Ca0.3MnO3 produzidos via síntese química. 2007. 114 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências de Bauru, 2007.