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NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Superconductivity and Charge Transfer Compensation by Direct Doping in the La1+xCayBa2-x-yCu3O7+δ System
Author(s): T. Mertelj, P. Stastny, F.C. Matacotta, P. Ganguly, and C.U. Segre
Publication: Physica C Volume: 183 Issue: Not Available Year: 1991 Page(s): 11-16
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature

Materials and Properties

La:123; [La-Ba(Ca)-Cu-O]
Material Specification for La:123; [La-Ba(Ca)-Cu-O] Process: Solid State Reaction
Notes: "... samples were prepared... using standard ceramic procedures. All the samples were annealed in oxygen atmosphere at room temperatures in the range 930-950 °C and slowly cooled to room temperature to allow for full oxidation."
Formula: La1+xBa2-x-yCayCu3O7+x
Informal Name: La:123
Chemical Family: La-Ba(Ca)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for La:123; [La-Ba(Ca)-Cu-O]
Crystal System: Tetragonal
Formula Units per Cell:
Space Group:
Cell Parameters
y of Cay (formula units) x of La1+x (formula units) Temp K a Å b Å c Å
0.33 -0.1 296 3.892 -- 11.716
0.33 0.0 296 3.891 -- 11.733
0.33 0.1 296 3.894 -- 11.724
0.33 0.2 296 3.892 -- 11.715
0.33 0.3 296 3.888 -- 11.674
0.33 0.4 296 3.883 -- 11.659
0.66 -0.1 296 3.879 -- 11.721
0.66 0.0 296 3.880 -- 11.732
0.66 0.1 296 3.875 -- 11.684
0.66 0.2 296 3.874 -- 11.643
0.66 0.3 296 3.870 -- 11.615
0.66 0.4 296 3.873 -- 11.600
1.0 -0.1 296 3.878 -- 11.691
1.0 0.0 296 3.875 -- 11.659
1.0 1.0 296 3.872 -- 11.620
1.0 0.2 296 3.870 -- 11.607
1.0 0.3 293 3.869 -- 11.593
Measurement Method: X-ray diffraction
"The room temperature structures were determined using a Siemens D500 X-ray diffractometer and monochromatized CuKα radiation... The structures were refined using the Rietveld method over the angular range 2θ=20° to 60°..."

Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Critical Temperature for La:123; [La-Ba(Ca)-Cu-O]
y of Cay (formula units) x of Lax (formula units) Critical Temperature (K)
0.33 -0.1 67
0.33 0.0 74
0.33 0.1 72
0.33 0.2 66
0.33 0.3 60
0.33 0.4 52
0.66 -0.1 79
0.66 0.0 78
0.66 0.1 80
0.66 0.2 76
0.66 0.3 60
0.66 0.4 41
1.0 -0.1 78
1.0 0.0 82
1.0 0.1 71
1.0 0.2 45
1.0 0.3 6
Measurement Method: Four-probe method
"... the resistivity was measured by a standard DC four probe technique, using current densities in the range 0.03-0.06 A/cm2." Critical temperatures at zero resistance were determined.

Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.