Studies
of heterogeneity properties of selected high-temperature superconductor surfaces |
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Authors: | P Staszczuk D Sternik G W Chądzyński E Robens M Błachnio |
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Institution: | 1. Department of Physicochemistry
of Solid Surface, Chemistry Faculty, Maria Curie-Sk?odowska
University, Lublin, Poland, 20-031, M. Curie-Sk?odowska Sq. 3 2. Technical University, Wroc?aw, Poland, 50-370, Wybrze?e Wyspiańskiego Str. 27 3. Institut für Anorganische Chemie
und Analytische Chemie, Johannes Gutenberg-Universit?t, Mainz, Germany, 55099, Duesbergweg 10-14
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Abstract: | Nitrogen
adsorption measured at 77 K was used to characterize the surface heterogeneity
of high-temperature superconductor surfaces. Properties relating to adsorption
and porosity of the solids (adsorption capacity, specific surface area, radii
and volume of the pores, pore-size distribution function) were determined
from nitrogen adsorption–desorption isotherms and atomic force microscopy
(AFM) for a series of oxide superconductors. It is shown that the adsorption
isotherms of all samples are S-shaped and belong to type II according to the
IUPAC classification. On the basis of the nitrogen adsorption isotherms and
AFM data, fractal dimensions were determined and correlations found with adsorption
and porosity parameters. |
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Keywords: | adsorption capacity atomic force microscope fractal dimension high-temperature superconductor porosity sorptometry |
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