Phase equilibria of the Ba–Sm–Y–Cu–O system for coated conductor applications

• Published in: Journal of solid state chemistry Vol. 183; no. 12; pp. 2855 - 2861
• Main Authors: Liu, G., Wong-Ng, W., Yang, Z., Kaduk, J.A., Cook, L.P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01-12-2010; Elsevier
• Subjects: (Ba 2− xSm x)(Sm 1− yY y)Cu 3O 6+ z solid solution; ALKALINE EARTH METAL COMPOUNDS; APPLICATIONS; BARIUM COMPOUNDS; Ba–Sm–Y–Cu–O phase diagrams; Coated conductors; COATINGS; Compatibility; Condensed matter: electronic structure, electrical, magnetic, and optical properties; COPPER COMPOUNDS; Cross-disciplinary physics: materials science; rheology; CUPRATES; Cuprates superconductors (high tc and insulating parent compounds); DIAGRAMS; DISPERSIONS; ELECTRICAL CONDUCTORS; EQUILIBRIUM; Exact sciences and technology; HIGH-TC SUPERCONDUCTORS; Homogeneity; HOMOGENEOUS MIXTURES; INFORMATION; MAGNETIC FLUX; MATERIALS SCIENCE; MIXTURES; OXIDES; OXYGEN COMPOUNDS; PHASE DIAGRAMS; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Phase equilibria; Phase relationships; Physics; PRESSURE RANGE; PRESSURE RANGE KILO PA; PRESSURE RANGE PA; RARE EARTH COMPOUNDS; SAMARIUM COMPOUNDS; SOLID SOLUTIONS; SOLUTIONS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TEMPERATURE RANGE; TEMPERATURE RANGE 1000-4000 K; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS; WIRE; Y-based cuprates; Yttrium; YTTRIUM COMPOUNDS; Coated conductors; (Ba 2− x Sm x )(Sm 1− y Y y )Cu 3O 6+ z solid solution; Ba–Sm–Y–Cu–O phase diagrams; Barium; Phase diagrams; Material processing; Superconductivity; Superconducting wires; O; Superconductors; Cu; Flux pinning; Solid solutions; Barium oxide; solid solution; Subsystem; Ba-Sm-Y-Cu-O phase diagrams; Phase equilibria; Coated conductor; Y; Yttrium oxide; Sm; Copper; Barium Copper Yttrium Oxides Mixed; Ba
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.09.001

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.
[Display omitted]