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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: Preparation and Properties of Ca-doped "Yb-124" Superconductors
Author(s): Y. Yaegashi, S. Adachi, K. Matsuura, A. Nara, S. Takano, and H. Yamauchi
Publication: Physica C Volume: 199 Issue: Not Available Year: 1992 Page(s): 177-183
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Resistivity (normal state), Magnetic Susceptibility, Thermoelectric Power

Materials and Properties

Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
Material Specification for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O] Process: Solid State Reaction
Notes: "The ceramic samples were prepared by a conventional solid-state reaction method using an O2-hot-isostatic-pressing (O2-HIP) technique. High-purity powders (99.9%) of Yb2O3, CaCO3, BaCO3, SrCO3 and CuO were used as starting materials. Using an automated ceramic processing system... appropriate amounts of powders for nominal compositions... were mixed and pressed. The lump mixtures were repeatedly calcined, ground and pressed. The compacted bar samples were then sintered and annealed at 1070 °C for 6 h at an oxygen partial pressure of P(O2)=40 MPa."
Formula: Yb1-yCayBa2-xSrxCu4O8
Informal Name: Yb:124
Chemical Family: Yb(Ca)-Ba(Sr)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
x of Srx (formula units) y of Cay (formula units) Temp K a Å b Å c Å
0.2 0.0 296 3.814(1) 3.857(1) 27.129(1)
0.4 0.0 296 3.805(1) 3.855(1) 27.072(1)
0.6 0.0 296 3.796(1) 3.851(1) 27.022(1)
0.8 0.0 296 3.794(1) 3.851(1) 27.007(1)
0.2 0.1 296 3.814(1) 3.854(1) 27.128(1)
0.4 0.1 296 3.805(1) 3.851(1) 27.076(1)
0.6 0.1 296 3.800(1) 3.851(1) 27.046(1)
0.8 0.1 296 3.798(1) 3.850(1) 27.036(1)
0.4 0.2 296 3.809(1) 3.852(1) 27.106(1)
0.4 0.3 296 3.809(1) 3.853(1) 27.111(1)
0.4 0.4 296 3.809(1) 3.852(1) 27.106(1)
Measurement Method: X-ray diffraction
"The lattice parameters were determined by X-ray powder diffraction using CuKα radiation." No additional measurement details were noted.

Cautions: Evaluated Data
Critical Temperature for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
x of Srx (formula units) y of Cay (formula units) Tc(magnetic) (K) Tc (onset) (K) Critical Temperature (K)
0.2 0.0 80 82 77
0.4 0.0 80 83 78
0.6 0.0 80 83 77
0.8 0.0 80 81 76
0.2 0.1 87 88 86
0.4 0.1 86 87 85
0.6 0.1 85 86 83
0.8 0.1 84 85 80
0.4 0.2 86 87 86
0.4 0.3 86 87 86
0.4 0.4 85 87 84
Measurement Method: Tc measurement
The authors indicated that Tc was determined both resistively and magnetically. "Electrical resistivity of the samples was measured by a conventional DC four-probe method. The DC magnetic susceptibility was monitored using a SQUID magnetometer (Quantum Design: Model MPMS)." No additional measurement details were noted.

Cautions: Evaluated Data
Resistivity (normal state) for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
x of Srx (formula units) y of Cax (formula units) Temperature (K) Resistivity (normal state) (mΩ·cm)
0.2 0.1 66 0.0
0.2 0.1 85 0.0
0.2 0.1 82 0.2
0.2 0.1 101 0.4
0.2 0.1 149 0.6
0.2 0.1 199 0.7
0.2 0.1 300 1.0
0.6 0.1 66 0.0
0.6 0.1 85 0.0
0.6 0.1 82 0.5
0.6 0.1 101 0.8
0.6 0.1 149 1.0
0.6 0.1 200 1.3
0.6 0.1 288 1.6
0.8 0.1 69 0.0
0.8 0.1 79 0.0
0.8 0.1 84 0.7
0.8 0.1 86 1.4
0.8 0.1 86 1.9
0.8 0.1 99 2.2
0.8 0.1 147 3.1
0.8 0.1 198 3.7
0.8 0.1 293 4.8
0.4 0.0 49 0.0
0.4 0.0 77 0.0
0.4 0.0 84 0.6
0.4 0.0 84 0.9
0.4 0.0 100 1.2
0.4 0.0 150 1.7
0.4 0.0 200 2.1
0.4 0.0 250 2.5
0.4 0.0 300 2.8
0.4 0.1 53 0.0
0.4 0.1 87 0.0
0.4 0.1 90 0.3
0.4 0.1 102 0.4
0.4 0.1 149 0.5
0.4 0.1 199 0.6
0.4 0.1 248 0.7
0.4 0.1 301 0.9
0.4 0.2 53 0.0
0.4 0.2 87 0.0
0.4 0.2 90 0.5
0.4 0.2 103 0.5
0.4 0.2 146 0.7
0.4 0.2 199 0.9
0.4 0.2 248 1.1
0.4 0.2 289 1.2
0.4 0.3 53 0.0
0.4 0.3 87 0.0
0.4 0.3 90 0.6
0.4 0.3 103 0.6
0.4 0.3 149 0.9
0.4 0.3 199 1.1
0.4 0.3 252 1.3
0.4 0.3 289 1.5
0.4 0.4 53 0.0
0.4 0.4 77 0.0
0.4 0.4 81 0.4
0.4 0.4 84 0.6
0.4 0.4 90 0.8
0.4 0.4 100 1.0
0.4 0.4 150 1.3
0.4 0.4 202 1.6
0.4 0.4 252 1.8
0.4 0.4 290 2.0
Measurement Method: Four-probe method
"Electrical resistivity of the samples was measured by a conventional DC four-probe method." (No additonal measurement details were noted.)

Cautions: Evaluated Data
Digitized data were obtained from Figures 3 and 7 of the paper.
Magnetic Susceptibility for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
x of Srx (formula units) y of Cay (formula units) Temperature (K) Magnetic Susceptibility (arbitrary)
0.2 0.1 5 -0.0039
0.2 0.1 35 -0.0039
0.2 0.1 55 -0.0039
0.2 0.1 75 -0.0038
0.2 0.1 80 -0.0038
0.2 0.1 83 -0.0038
0.2 0.1 87 -0.0013
0.2 0.1 88 -0.0002
0.2 0.1 88 0.0000
0.2 0.1 100 0.0000
0.4 0.1 4 -0.0042
0.4 0.1 35 -0.0042
0.4 0.1 55 -0.0043
0.4 0.1 75 -0.0042
0.4 0.1 80 -0.0042
0.4 0.1 86 -0.0015
0.4 0.1 87 -0.0001
0.4 0.1 100 0.0000
0.6 0.1 5 -0.0039
0.6 0.1 35.0 -0.0040
0.6 0.1 56 -0.0039
0.6 0.1 75 -0.0039
0.6 0.1 80 -0.0036
0.6 0.1 82 -0.0025
0.6 0.1 85 -0.0006
0.6 0.1 86 -0.0003
0.6 0.1 100 0.0000
0.8 0.1 5 -0.0029
0.8 0.1 35 -0.0029
0.8 0.1 55 -0.0029
0.8 0.1 64 -0.0028
0.8 0.1 76 -0.0027
0.8 0.1 81 -0.0015
0.8 0.1 82 -0.0008
0.8 0.1 83 -0.0003
0.8 0.1 85 -0.0001
0.8 0.1 100 0.0000
0.4 0.0 5 -0.0050
0.4 0.0 19 -0.0050
0.4 0.0 39 -0.0049
0.4 0.0 60 -0.0048
0.4 0.0 72 -0.0046
0.4 0.0 76 -0.0034
0.4 0.0 80 -0.0001
0.4 0.0 82 0.0000
0.4 0.0 100 0.0000
0.4 0.1 5 -0.0042
0.4 0.1 25 -0.0042
0.4 0.1 55 -0.0042
0.4 0.1 75 -0.0041
0.4 0.1 81 -0.0040
0.4 0.1 85 -0.0014
0.4 0.1 87 0.0000
0.4 0.1 100 0.0000
0.4 0.2 5 -0.0027
0.4 0.2 35 -0.0027
0.4 0.2 54 -0.0027
0.4 0.2 75 -0.0026
0.4 0.2 80 -0.0026
0.4 0.2 84 -0.0021
0.4 0.2 85 -0.0009
0.4 0.2 86 0.0000
0.4 0.2 100 0.0000
0.4 0.3 4 -0.0027
0.4 0.3 35 -0.0027
0.4 0.3 55 -0.0027
0.4 0.3 75 -0.0026
0.4 0.3 81 -0.0024
0.4 0.3 84 -0.0021
0.4 0.3 85 -0.0010
0.4 0.3 86 0.0000
0.4 0.3 100 0.0000
Measurement Method: SQUID magnetometer
"The DC magnetic susceptibility was monitored using a SQUID magnetometer (Quantum Design: Model MPMS)." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figures 4 and 8 of the paper.
Thermoelectric Power for Yb:124; [Yb(Ca)-Ba(Sr)-Cu-O]
x of Srx (formula units) y of Cay (formula units) Temperature (K) Thermoelectric Power (µV/K)
0.4 0.0 87 5.1
0.4 0.0 96 5.3
0.4 0.0 100 6.0
0.4 0.0 104 6.2
0.4 0.0 116 6.4
0.4 0.0 152 6.1
0.4 0.0 176 5.6
0.4 0.0 212 5.3
0.4 0.0 220 5.6
0.4 0.0 224 5.3
0.4 0.0 232 5.6
0.4 0.0 296 5.3
0.4 0.0 320 5.3
0.4 0.1 65 -0.3
0.4 0.1 77 -0.5
0.4 0.1 89 -0.4
0.4 0.1 93 0.2
0.4 0.1 97 0.8
0.4 0.1 129 0.5
0.4 0.1 157 0.3
0.4 0.1 181 0.1
0.4 0.1 209 0.6
0.4 0.1 237 0.8
0.4 0.1 262 1.2
0.4 0.1 290 1.5
0.4 0.1 318 1.6
Measurement Method: Thermopower measurement
"Thermoelectric power was measured by a DC method using a 10 nV-resolution digital voltmeter at temperatures between 50 K and 310 K." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 10 of the paper.