Efeitos da substituição do Cu por Mn no composto YBA2Cu3O7-G

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

Samples of the compounds YBa2(Cu1-xMnx)3O7-d , x = 0,0, 0,01, 0,025, 0,05, 0,075, 0,10, 0,15 e 0,20, were sintered at. 950º, 970º e 1020º C. These samples were characterized by X ? ray diffraction, optical metallography, electrical resistivity and magnetic susceptibility. Superconductivity around 92 K for all samples. The YBa2Cu3O7-d solubility limit for Mn is very small, less than x = 0,005. This fact means precipitation of non-superconducting additional phases, whose stoichiometric were identified as Y2BaCuO5 and Ba3Mn2O8. The presence of this phases changes substancially the microstructure of the samples. This effect being greater for the samples sintered at 970º C. For this series of samples it was observed na anomaly in the thermal transport properties induced by the microstructural modifications

ASSUNTO(S)

magnesio compostos de cobre supercondutores

ACESSO AO ARTIGO

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