<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">We studied the effects of slight Sm-Ba non-stoichiometry in Sm-Ba-Cu-O superconducting compounds on their transition, structural, and magnetic properties. Two series of single-phase samples of Sm1+xBa2-xCu3O7+Δ and Sm1+xBa2-xCu3O7+Δ with composition deviation from stoichiometry <italic>x</italic> from 0 to 0.1 were synthesized by the solid-state reaction method from Sm2O3, BaCO3 and CuO precursors and sintered at the temperature of ~ 1060 °C in flowing oxygen. All samples showed the values of <italic>Tc</italic> > 90 K and the volume density, p, 6.45 g cm-3 &lt; p ≤ 6.73 g cm-3. The effect of the composite deviation of <italic>x</italic> on <italic>Tc</italic>, Δ<italic>Tc</italic>, and volume magnetization <italic>M</italic> was studied. For Sm1+xBa2-xCu3O7+Δ compounds, optimal values of <italic>x</italic> were determined to maximize the width of the magnetization hysteresis at higher values of the applied magnetic field, corresponding mainly to the grain contribution. We also prepared the Sm1+xBa2-xCu3O7+Δ samples with <italic>x</italic> from 0 to 0.1 using the same processing conditions as in the case of A and B series. For the Sm1+xBa2-xCu3O7+Δ samples, values of <italic>x</italic> = 0.02 - 0.03 optimize <italic>Tc</italic>, Δ<italic>Tc</italic>, <italic>Hp1</italic> as well as <italic>M</italic>.</abstract>

We studied the effects of slight Sm-Ba non-stoichiometry in Sm-Ba-Cu-O superconducting compounds on their transition, structural, and magnetic properties. Two series of single-phase samples of Sm1+xBa2-xCu3O7+Δ and Sm1+xBa2-xCu3O7+Δ with composition deviation from stoichiometry x from 0 to 0.1 were synthesized by the solid-state reaction method from Sm2O3, BaCO3 and CuO precursors and sintered at the temperature of ~ 1060 °C in flowing oxygen. All samples showed the values of Tc > 90 K and the volume density, p, 6.45 g cm-3 < p ≤ 6.73 g cm-3. The effect of the composite deviation of x on Tc, ΔTc, and volume magnetization M was studied. For Sm1+xBa2-xCu3O7+Δ compounds, optimal values of x were determined to maximize the width of the magnetization hysteresis at higher values of the applied magnetic field, corresponding mainly to the grain contribution. We also prepared the Sm1+xBa2-xCu3O7+Δ samples with x from 0 to 0.1 using the same processing conditions as in the case of A and B series. For the Sm1+xBa2-xCu3O7+Δ samples, values of x = 0.02 - 0.03 optimize Tc, ΔTc, Hp1 as well as M.

Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Institute of Measurement Science, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia

Measurement Science Review

We studied the effects of slight Sm-Ba non-stoichiometry in Sm-Ba-Cu-O superconducting compounds on their transition, structural, and magnetic properties. Two...

Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Published Online: Apr 08, 2011

Page range: 9 - 14

DOI: https://doi.org/10.2478/v10048-011-0005-2

Keywords
Superconductors, Sm-123, cation non-stoichiometry, critical temperature, magnetization

This content is open access.

Effects of Slight Non-Stoichiometry in Sm-Ba-Cu-O Systems on Superconducting Characteristics

Published Online: Apr 08, 2011

Page range: 9 - 14

DOI: https://doi.org/10.2478/v10048-011-0005-2

KeywordsSuperconductors, Sm-123, cation non-stoichiometry, critical temperature, magnetization

This content is open access.

Keywords
Superconductors, Sm-123, cation non-stoichiometry, critical temperature, magnetization