Abstract
The principal goal of this work is to quantify the influence of texture of ceramic superconductors ReBaCuO (Re=Dy, Y) on their critical current density (Jc). The magnetic alignment of particles at ambient temperature is the first technique who has allowed us to produce superconducting (Meissner effect) and textured ceramics. However, these materials are very brittle because of their porosity and this makes it impossible to measure their Jc. Press-forging (or creep sintering) is the second technique who has allowed us to prepare highly textured ceramics materials which are also dense. We have studied the influence of various conditions of thermomechanical treatment (sintering time and temperature, applied load, rate of deformation, density of the material at the beginning) on the texture quality. We have shown that at 900 deg, the eutectic liquid formed by BaCuO{sub 2}, CuO and YBa{sub 2}Cu{sub 3}0{sub 7-Y} various mechanisms that help explain the formation of observed texture. After the oxidation stage which requires heat treatment under controlled atmospheres, we obtain superconducting ceramics (Tc=85 K). Moreover, this study also shows that the texture can improve the Jc by 400%, to 750 A/cm{sup 2} at 77 K in the best specimens. This low value is explained by the
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Citation Formats
Deschanels, X.
An investigation of texturing by magnetic and mechanical techniques in high critical temperature superconducting ceramics; Etude de l`alignement mecanique et magnetique des grains des ceramiques supraconductrices a haute temperature critique.
France: N. p.,
1992.
Web.
Deschanels, X.
An investigation of texturing by magnetic and mechanical techniques in high critical temperature superconducting ceramics; Etude de l`alignement mecanique et magnetique des grains des ceramiques supraconductrices a haute temperature critique.
France.
Deschanels, X.
1992.
"An investigation of texturing by magnetic and mechanical techniques in high critical temperature superconducting ceramics; Etude de l`alignement mecanique et magnetique des grains des ceramiques supraconductrices a haute temperature critique."
France.
@misc{etde_10129386,
title = {An investigation of texturing by magnetic and mechanical techniques in high critical temperature superconducting ceramics; Etude de l`alignement mecanique et magnetique des grains des ceramiques supraconductrices a haute temperature critique}
author = {Deschanels, X}
abstractNote = {The principal goal of this work is to quantify the influence of texture of ceramic superconductors ReBaCuO (Re=Dy, Y) on their critical current density (Jc). The magnetic alignment of particles at ambient temperature is the first technique who has allowed us to produce superconducting (Meissner effect) and textured ceramics. However, these materials are very brittle because of their porosity and this makes it impossible to measure their Jc. Press-forging (or creep sintering) is the second technique who has allowed us to prepare highly textured ceramics materials which are also dense. We have studied the influence of various conditions of thermomechanical treatment (sintering time and temperature, applied load, rate of deformation, density of the material at the beginning) on the texture quality. We have shown that at 900 deg, the eutectic liquid formed by BaCuO{sub 2}, CuO and YBa{sub 2}Cu{sub 3}0{sub 7-Y} various mechanisms that help explain the formation of observed texture. After the oxidation stage which requires heat treatment under controlled atmospheres, we obtain superconducting ceramics (Tc=85 K). Moreover, this study also shows that the texture can improve the Jc by 400%, to 750 A/cm{sup 2} at 77 K in the best specimens. This low value is explained by the presence of non-superconducting secondary phases and amorphous phases at the grain boundaries. (Author). 120 refs., figs., tabs.}
place = {France}
year = {1992}
month = {Nov}
}
title = {An investigation of texturing by magnetic and mechanical techniques in high critical temperature superconducting ceramics; Etude de l`alignement mecanique et magnetique des grains des ceramiques supraconductrices a haute temperature critique}
author = {Deschanels, X}
abstractNote = {The principal goal of this work is to quantify the influence of texture of ceramic superconductors ReBaCuO (Re=Dy, Y) on their critical current density (Jc). The magnetic alignment of particles at ambient temperature is the first technique who has allowed us to produce superconducting (Meissner effect) and textured ceramics. However, these materials are very brittle because of their porosity and this makes it impossible to measure their Jc. Press-forging (or creep sintering) is the second technique who has allowed us to prepare highly textured ceramics materials which are also dense. We have studied the influence of various conditions of thermomechanical treatment (sintering time and temperature, applied load, rate of deformation, density of the material at the beginning) on the texture quality. We have shown that at 900 deg, the eutectic liquid formed by BaCuO{sub 2}, CuO and YBa{sub 2}Cu{sub 3}0{sub 7-Y} various mechanisms that help explain the formation of observed texture. After the oxidation stage which requires heat treatment under controlled atmospheres, we obtain superconducting ceramics (Tc=85 K). Moreover, this study also shows that the texture can improve the Jc by 400%, to 750 A/cm{sup 2} at 77 K in the best specimens. This low value is explained by the presence of non-superconducting secondary phases and amorphous phases at the grain boundaries. (Author). 120 refs., figs., tabs.}
place = {France}
year = {1992}
month = {Nov}
}