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Phase equilibria of the Ba–Sm–Y–Cu–O system for coated conductor applications
Ist Teil von
Journal of solid state chemistry, 2010-12, Vol.183 (12), p.2855-2861
Ort / Verlag
Amsterdam: Elsevier Inc
Erscheinungsjahr
2010
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
The complex phase relationships near the BaO-poor region of the quaternary Ba–Sm–Y–Cu–O oxide system prepared in pure air (
p
O
2
=22
kPa, 950
°C) and in 0.1% O
2 (
p
O
2
=100
Pa, 810
°C) have been determined. This investigation also included the subsolidus compatibilities in ten subsystems (Ba–Sm–Y–O, Ba–Sm–Cu–O, Ba–Y–Cu–O, Sm–Y–Cu–O, Ba–Sm–O, Ba–Y–O, Ba–Cu–O, Sm–Y–O, Sm–Cu–O, and Y–Cu–O), and the homogeneity range of five solid solutions (Ba(Sm
x
Y
2−
x
)CuO
5, (Sm,Y)
2O
3, (Sm,Y)
2CuO
4, (Y,Sm)
2Cu
2O
5, and Ba(Sm,Y)
2O
4). The single phase range of the superconductor solid solution, (Ba
2−
x
Sm
x
)(Sm
1−
y
Y
y
)Cu
3O
6+
z
, and the phase compatibilities in its vicinity, which are particularly important for processing, are described in detail. The phase equilibrium data of the Ba–Sm–Y–Cu–O system will enable the improvement of the intrinsic superconducting properties of second-generation wires, and facilitate the flux-pinning process.
Phase diagram overview of the Ba–Sm–Y–Cu–O system in the BaO-poor region prepared in
p
O2=22
kPa, 950
°C.
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