Spectrophotometric method for rapid estimation of the oxygen stoichiometry in YBCO superconducting samples

• Autorzy: Stela Georgieva , Tsvetanka Nedeltcheva , Latinka Vladimirova , Angelina Stoyanova-Ivanova
• Języki publikacji: EN

Abstrakty

EN

Abstract Detailed investigations on the possibility for determination of the oxygen stoichiometry in YBa2Cu3Oy superconducting samples by measuring the absorbance of the colored Co(III)-EDTA and Cu(II)-EDTA complexes in one solution have been performed. The absorptivity of the complexes at pH 2.5 and 4.9 as well as Beer’s law have been studied. The content of the solution for the sample dissolving has been established. The stoichiometry of the oxidation-reduction reaction between Cu(III) from the sample and Co(II) in the solution has been proved. The possibility to dissolve the sample in air has been tested. As a result a simple and rapid spectrophotometric method for the determination of the δ non-stoichiometric oxygen coefficient in YBa2Cu3O6.5+δ samples has been developed without precise measurement of the sample mass. The standard deviation of the δ- and y-coefficient results is 0.017. The reproducibility of the y-values in relative units (sr ) is 0.2%. The accuracy of the results has been confirmed by the method, which is based on the absorbance measurement of the I 3−-starch compound. Graphical abstract [...]

Słowa kluczowe

EN

Oxygen stoichiometry; YBCO superconductors; Co(III) and Cu(II) determination; Spectrophotometry

• Czasopismo: Open Chemistry
• Rocznik: 2013
• Tom: 11
• Numer: 3
• Strony: 381-387

Daty

wydano

2013-03-01

online

2012-12-28

Twórcy

autor

Stela Georgieva

• Department of Analytical Chemistry, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria,

autor

Tsvetanka Nedeltcheva

• Department of Analytical Chemistry, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

autor

Latinka Vladimirova

• Department of Analytical Chemistry, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

autor

Angelina Stoyanova-Ivanova

• Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria

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Identyfikatory

DOI

10.2478/s11532-012-0172-5