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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: The Specific Heat Anomaly of Bi2Sr2CaCu2O8+δ at Tc in Dependence on the Oxygen Content
Author(s): W. Schnelle, N. Knauf, J. Bock, E. Preisler, and J. Hudepohl
Publication: Physica C Volume: 209 Issue: Not Available Year: 1993 Page(s): 456-462
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Resistivity (normal state), Magnetic Susceptibility, Specific Heat

Materials and Properties

Bi:2212; [Bi-Sr-Ca-Cu-O]
Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O] Process: Melt Processed
Notes: "All samples... were manufactured by a melt casting process... appropriate amounts of Bi2O3, SrO, CaO and CuO were mixed, transferred to an aluminium oxide crucible, heated to 1030 °C (for 0.5 h) until the mixture was completely molten and then poured into a copper tube. The ingot was then removed from the mould and annealed at 770 °C for 24 h and at 850 °C for 120 h in air. Five similarly shaped samples cut from the same rod,... #2-#6, were additionally annealed at 690-750 °C for 20-150 h in Ar and/or in O2 atmospheres in order to vary the oxygen content..."
Formula: Bi2Sr2CaCu2O8+x
Informal Name: Bi:2212
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
Sample Number () x of O8+x (formula units) Tc (onset) (K) Critical Temperature (K)
1 0.182 86.6 82.5
2 0.220 80.6 76.7
3 0.189 89.1 85.0
4 0.186 88.6 84.8
5 0.178 98.3 91.0
6 0.169 98.7 91.5
Measurement Method: Electrical resistivity
"Resistivity (was measured). The geometry factor of the measurements was determined with an error of...20%." No additional measurement details were noted.

Cautions: Evaluated Data
Resistivity (normal state) for Bi:2212; [Bi-Sr-Ca-Cu-O]
Sample Number () Temperature (K) Resistivity (normal state) (mΩ·cm)
1 83 0.0
1 88 0.5
1 101 0.6
1 151 1.0
1 202 1.3
1 292 1.9
2 77 0.0
2 84 0.7
2 101 0.9
2 150 1.4
2 203 1.9
2 266 2.5
3 85 0.0
3 90 0.5
3 99 0.6
3 151 0.9
3 200 1.2
3 294 1.8
4 85 0.0
4 90 0.4
4 101 0.5
4 151 0.8
4 201 1.0
4 294 1.5
5 92 0.0
5 101 0.4
5 151 0.7
5 201 0.9
5 266 1.1
6 92 0.0
6 96 0.3
6 151 0.6
6 201 0.8
6 291 1.1
6 293 1.1
Measurement Method: Electrical resistivity
"Resistivity (was measured). The geometry factor of the measurements was determined with an error of...20%." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Magnetic Susceptibility for Bi:2212; [Bi-Sr-Ca-Cu-O]
Sample Number () Temperature (K) Magnetic Susceptibility (arbitrary)
1 40 -0.99
1 55 -0.98
1 68 -0.94
1 75 -0.74
1 78 -0.40
1 81 -0.05
1 83 0
1 90 0
2 40 -0.99
2 55 -0.96
2 67 -0.84
2 74 -0.34
2 80 0
2 90 0
3 40 -0.99
3 53 -0.98
3 64 -0.96
3 73 -0.90
3 78 -0.70
3 82 -0.38
3 84 -0.04
3 86 0
3 90 0
4 40 -0.99
4 53 -0.98
4 67 -0.96
4 75 -0.73
4 78 -0.45
4 82 -0.22
4 84 -0.02
4 85 0
4 90 0
5 40 -0.99
5 55 -0.98
5 72 -0.95
5 84 -0.84
5 88 -0.59
5 90 -0.19
5 90 -0.05
5 93 0
5 100 0
6 40 -0.99
6 55 -0.98
6 71 -0.97
6 83 -0.88
6 88 -0.65
6 90 -0.30
6 91 -0.07
6 93 0
6 100 0
Measurement Method: Ac susceptibility
"AC-susceptibilities (were measured) in external AC magnetic fields of (0.8 A/m = 0.01 Oe) (the earth field was shielded)." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Specific Heat for Bi:2212; [Bi-Sr-Ca-Cu-O]
Sample Number () Temperature (K) Specific Heat (J kg-1 K-1)
1 60 104
1 68 123
1 75 138
1 82 153
1 93 173
1 102 190
1 111 207
1 120 221
2 61 105
2 66 117
2 73 135
2 84 156
2 96 180
2 107 199
2 120 220
3 60 104
3 67 121
3 75 138
3 80 149
3 86 161
3 97 181
3 110 204
3 120 220
4 59 103
4 66 119
4 74 136
4 83 155
4 90 169
4 106 197
4 120 220
5 60 104
5 70 126
5 79 146
5 87 164
5 93 176
5 101 190
5 112 209
5 120 220
6 60 104
6 65 116
6 73 133
6 81 150
6 93 177
6 102 191
6 111 206
6 120 221
Measurement Method: Specific heat method
The authors cite W. Schnelle et al., Physica C, Vol. 168, 465 (1990), and summarize the procedure as follows. "The specific heat was measured between 25 K and 300 K by a continuous method... The resolution of the measurement at the typical Tc of our... samples is better than 5x10-4 of the absolute value, which is only accurate to ±3% due to the poor thermal conductivity of the pellets and to the sometimes insufficient thermal contact between the pellet and the heater."

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