Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Crystal Growth
Notes: The authors cite J.-M. Imer et al., Phys. Rev. Lett, Vol. 62, 336 (1989), and summarize the procedure as follows. "The crystals were cleaved into thin ab-plane sheets roughly 1 mm on a side and 5-10 µm thick in the c-direction."
Formula: Bi2Sr2CaCu2O8
Informal Name: Bi:2212
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
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Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Tc(onset) (K) |
Critical Temperature (K) |
| 85 |
80 |
Measurement Method: Ac susceptibility
"These data were obtained using a modification of the standard Montgomery method. The contact geometry... consists of four parallel silver paint strips, with each strip placed along an edge of the two opposite ab-plane faces of the crystal, and all four strips perpendicular to the c axis."
Cautions: Evaluated Data
Thermal Conductivity for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Thermal Conductivity (W m-1 K-1) |
| 39 |
0.50 |
| 55 |
0.57 |
| 73 |
0.65 |
| 114 |
0.70 |
| 182 |
0.77 |
| 249 |
0.81 |
| 306 |
0.86 |
Measurement Method: Steady-state comparative technique
"... a specially constructed "thermal clamp cell" was used... The cell consists of a calibrated Constantan thermal source rod attached to the ab-plane face of a small... crystal. A spring-loaded copper thermal sink rod was attached to the opposite sample face. The relatively weak pressure supplied by the sink rod spring was effective in preventing "delamination" of the crystal along the c-axis. Silver paint was used to ensure good thermal contact between the sample and the source and sink rods. The actual measurement was performed using a steady-state comparative technique, where the temperature gradient developed across the sample was measured directly with a miniature differential thermocouple, attached to the sample faces with a very small amount of electrically insulating stycast epoxy... Error due radiation and heat leads through the wires was estimated to be only a few percent."
Cautions: Evaluated Data
"(The values are for) the temperature dependence of the c-axis thermal conductivity." Digitized data were obtained from Figure 1a of the paper.
