Hts Logo

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: Structure and Superconductivity in the Single Cu-O Layered (Bi2-xPbx)(Sr2-yLay)CuO6+δ System
Author(s): K. Zhang, G. Seidler, B.H. Ma, and C.U. Segre
Publication: Physica C Volume: 179 Issue: Not Available Year: 1991 Page(s): 405-410
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Magnetic Susceptibility

Materials and Properties

Bi:221; [Bi(Pb)-Sr(La)-Cu-O]
Material Specification for Bi:221; [Bi(Pb)-Sr(La)-Cu-O] Process: Solid State Reaction
Notes: "High purity Bi2O3, PbO, SrCO3, La2O3 and CuO were used as starting materials. All samples, except (Bi1.5Pb0.5Sr2CuO6+δ, were weighed, ground thoroughly, sintered at 900 °C for 24 h in air and quenched to room temperature. After the first firing, the samples were reground, pressed into pellets and sintered at 900 °C for an additional 24 h before quenching into liquid nitrogen. The (Bi1.5Pb0.5)Sr2CuO6+δ sample was prepared by the same process but at 850 °C instead of 900 °C due to its lower melting point. We chose to quench our samples into liquid nitrogen rather than to cool them slowly because quenched samples show sharper superconducting transition at higher temperatures. A few selected samples were further annealed for 24 h at 750 °C under flowing N2 and then furnace cooled to room temperature."
Formula: Bi2-xPbxSr2-yLayCuOz
Informal Name: Bi:221
Chemical Family: Bi(Pb)-Sr(La)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Bi:221; [Bi(Pb)-Sr(La)-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
x of Pbx, y of Lay (formula units) z of Oz (formula units) Temp K a Å b Å c Å
0.0, 0.4 6.26 296 5.39 5.41 24.48
0.2, 0.4 6.18 296 5.37 5.40 24.51
0.3, 0.4 6.14 296 5.34 5.39 24.50
0.4, 0.4 6.07 296 5.33 5.40 24.49
0.5, 0.4 6.05 296 5.30 5.40 24.47
0.6, 0.4 6.06 296 5.29 5.41 24.46
0.8, 0.4 6.00 296 5.27 5.40 24.44
1.0, 0.4 6.05 296 5.28 5.41 24.42
0.5, 0.0 5.97 296 5.29 5.39 24.56
0.5, 0.2 5.99 296 5.28 5.38 24.53
0.5, 0.3 6.00 296 5.29 5.40 24.50
0.5, 0.4 6.05 296 5.31 5.40 24.48
0.5, 0.5 6.07 296 5.33 5.40 24.47
0.5, 0.6 6.12 296 5.34 5.40 24.45
0.5, 0.8 6.18 296 5.39 5.41 24.40
0.5, 1.0 6.29 296 5.41 5.42 24.31
Measurement Method: X-ray diffraction
"X-ray diffraction data for all of the samples were collected using an automated General Electric XRD5 diffractometer with a CuKα radiation. Lattice parameters were calculated using Rietveld profile refinement of the diffraction patterns."

Cautions: Evaluated Data
Digitized data were obtained from Figures 1, 2, and 3 of the paper.
Critical Temperature for Bi:221; [Bi(Pb)-Sr(La)-Cu-O]
x of Pbx (formula units) y of Lay (formula units) z of Oz (formula unit) Critical Temperature (K)
0.0 0.4 6.26 13.4
0.2 0.4 6.18 13.3
0.3 0.4 6.14 19.7
0.4 0.4 6.07 22.8
0.5 0.4 6.05 28.2
0.6 0.4 6.06 27.9
0.8 0.4 6.00 17.6
1.0 0.4 6.05 20.1
0.5 0.2 5.99 9.4
0.5 0.3 6.00 16.4
0.5 0.4 6.05 28.2
0.5 0.5 6.07 18.2
0.5 0.6 6.12 11.1
Measurement Method: Four-probe method
"The resistivity of the samples was measured in an Air Products DISPLEX closed-cycle refrigerator capable of reaching 10 K with Chromel-Au/Fe thermocouple thermometry accurate to 0.5 K over the measured temperature range. The samples were cut into rectangular bars and measured using the standard four-probe technique with leads attached by silver paint. A computer-controlled measurement system consisting of Keithley nanovoltmeter (model 181), current source (model 224) and scanner (model 705) was used to measure the resistivity of up to 6 samples at a time while slowly warming from 15 K to 300 K over 7 h... Superconducting zero resistance temperatures (were determined)."

Cautions: Evaluated Data
Digitized data were obtained from Figures 3 and 6 of the paper.
Magnetic Susceptibility for Bi:221; [Bi(Pb)-Sr(La)-Cu-O]
x of Pbx (formula units) y of Lay (formula units) z of Oz (formula units) Temperature (K) Magnetic Susceptibility (arbitrary)
0.2 0.4 6.26 6 -0.013
0.2 0.4 6.26 10 -0.010
0.2 0.4 6.26 15 -0.005
0.2 0.4 6.26 20 -0.001
0.2 0.4 6.26 25 0.000
0.2 0.4 6.26 35 0.000
0.4 0.4 6.07 6 -0.034
0.4 0.4 6.07 11 -0.031
0.4 0.4 6.07 16 -0.026
0.4 0.4 6.07 20 -0.018
0.4 0.4 6.07 23 -0.009
0.4 0.4 6.07 25 -0.002
0.4 0.4 6.07 27 0.000
0.4 0.4 6.07 35 0.000
0.6 0.4 6.06 6 -0.053
0.6 0.4 6.06 13 -0.049
0.6 0.4 6.06 20 -0.039
0.6 0.4 6.06 24 -0.027
0.6 0.4 6.06 27 -0.012
0.6 0.4 6.06 29 -0.003
0.6 0.4 6.06 30 -0.001
0.6 0.4 6.06 31 0.000
0.6 0.4 6.06 35 0.000
Measurement Method: SQUID magnetometer
"Magnetic susceptibility measurements were taken using a Quantum Design SQUID magnetometer by cooling in zero field and then measuring in a (398 A/m = 5 Oe) applied field during warming."

Cautions: Evaluated Data
Digitized data were obtained from Figure 3 and 8 of the paper.