Obtenção de filmes finos supercondutores do sistema BSCCO dopados com prata
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Data
2008-06-13
Autores
Torsoni, Guilherme Botega [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Filmes de BiPbSrCaCuO vem sendo estudados a muito tempo por muitos pesquisadores, onde já foram caracterizados de várias formas, tanto estrutural como eletricamente. O presente trabalho trata de modificações estruturais do composto por meio da dopagem; onde filmes de BPSCCO foram dopados com Ag para assim tentar melhorar as características do material, como a largura da transição na temperatura crítica (Tc) e a densidade de corrente crítica (Jc). Trabalhos anteriores feitos com bulks mostraram que com o mesmo tipo de dopagem, obtiveram-se maiores densidades de correntes para determinados valores de porcentagem de dopante, porém obtendo uma dependência não linear da densidade de corrente pela porcentagem de dopante. No presente trabalho foi utilizado um processo químico na obtenção de filmes, devido à facilidade em se efetuar a mistura e a homogeneização dos compostos precursores. Assim desenvolveu-se uma metodologia baseada na mesma empregada por M. Pechini, onde foram produzidas amostras dopadas com 0, 5, 10, 15 e 20% em peso de Prata, obtendo-se filmes da ordem de μm. Para as caracterizações elétricas dos filmes foi utilizada a técnica de quatro pontas dc, obtendo-se o comportamento da resistência em função da temperatura e também da Tensão pela corrente elétrica aplicada, para caracterização da Tc e Jc, respectivamente. Os resultados das caracterizações elétricas mostraram que para todas as amostras houve transições supercondutoras, a amostra dopada com 5% de Ag obteve-se o mais alto valor de Tc=93K. Para as medidas de Jc, os gráficos também mostraram um pico na amostra com 5%, e para as outras amostras não houve nenhuma mudança significativa, indicando que pode existir certa relação com os resultados encontrados na literatura. Pelos resultados obtidos, pode-se considerar que a metodologia aplicada pode se tornar extremamente promissora na obtenção...
Films of BiPbSrCaCuO have been studied by many researchers during a long time, which have been characterized by different ways such as structural and electrically. In this work it has submitted to some structural modifications of the compound through doping. Films of BPSCCO were doped with Ag for an attempt to improve their characteristics such as the width of the transition in critical temperature (Tc) and the critical current density ( Jc). Some previous works with bulks showed that, with the same type of doping, it has achieved higher values of current densities dependent of the percentage of doping, but obtaining a non-linear dependence of the current density with percentage of doping. In this work was a chemical process used to obtain superconductor films, because it is easy to do the mixture and the homogenization of precursor compounds, so it has developed a methodology based on the same employed by M. Pechini, where the films were doped with 0, 5, 10, 15 and 20% silver in weight, resulting in films with thickness around a few μm. In the electrical characterization of the films the four points DC technique was used, of resulting in the behavior of resistance depending on the temperature and voltage in function of the electrical applied current, to characterize the Tc and the Jc, respectively. The electrical characterization results showed that for all samples have superconducting transitions, but the sample doped with 5% of Ag presented the highest value of Tc = 93K. For Jc measurements, the graphs also showed a peak in the sample with 5% in agree with observed before, and for other samples were not observed significant change, indicating that there is some agreement with the results found in the literature. Based in the obtained results, may consider that the applied methodology can become extremely promising to obtain high quality films with the aim to conduce technological applications.
Films of BiPbSrCaCuO have been studied by many researchers during a long time, which have been characterized by different ways such as structural and electrically. In this work it has submitted to some structural modifications of the compound through doping. Films of BPSCCO were doped with Ag for an attempt to improve their characteristics such as the width of the transition in critical temperature (Tc) and the critical current density ( Jc). Some previous works with bulks showed that, with the same type of doping, it has achieved higher values of current densities dependent of the percentage of doping, but obtaining a non-linear dependence of the current density with percentage of doping. In this work was a chemical process used to obtain superconductor films, because it is easy to do the mixture and the homogenization of precursor compounds, so it has developed a methodology based on the same employed by M. Pechini, where the films were doped with 0, 5, 10, 15 and 20% silver in weight, resulting in films with thickness around a few μm. In the electrical characterization of the films the four points DC technique was used, of resulting in the behavior of resistance depending on the temperature and voltage in function of the electrical applied current, to characterize the Tc and the Jc, respectively. The electrical characterization results showed that for all samples have superconducting transitions, but the sample doped with 5% of Ag presented the highest value of Tc = 93K. For Jc measurements, the graphs also showed a peak in the sample with 5% in agree with observed before, and for other samples were not observed significant change, indicating that there is some agreement with the results found in the literature. Based in the obtained results, may consider that the applied methodology can become extremely promising to obtain high quality films with the aim to conduce technological applications.
Descrição
Palavras-chave
Supercondutores, Filmes finos, BSCCO, Dopagem
Como citar
TORSONI, Guilherme Botega. Obtenção de filmes finos supercondutores do sistema BSCCO dopados com prata. 2008. 77 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, 2008.