Material Specification for Bi:221; [Bi-Sr-Cu-O]
Process: Melt Processed
Notes: "Samples were grown using 99.999% pure Bi2O3 and CuO and 99.995% pure SrCO3. Starting materials were combined in a non-stochiometric manner according to Bi2+xSr2-xCu1.5Oexcess, with the extra copper intended as a self-flux. The Bi/Sr ratio was varied from 1.00 to 1.17. Both growth and annealing furnaces were modified to provide an oxygen ambient whenever the growth temperature exceeded 400 °C. ... The ingredients were carefully mixed, ground, and remixed for approximately 30 min in an agate mortar, then heated in an alumina crucible (Coors CH 20) in a flowing oxygen environment... The temperature and its gradient were controlled using two programmable controllers (Omega Engineerig CN 2010). In order to facilitate surface growth, a temperature gradient of roughly 5 °C/cm, cooler at the top than the bottom, was maintained along the crucible. Samples selected for measurement contained no visible grain boundaries under 60 x magnification and were typically of dimensions 2 mm x 2 mm x 0.02 mm."
Formula: Bi2Sr2CuO6
Informal Name: Bi:221
Chemical Family: Bi-Sr-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Resistivity (normal state) for Bi:221; [Bi-Sr-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 1 |
0.0031 |
| 2 |
0.0035 |
| 3 |
0.0039 |
| 9 |
0.0039 |
| 20 |
0.0040 |
| 36 |
0.0042 |
| 49 |
0.0045 |
| 70 |
0.0048 |
| 89 |
0.0051 |
| 122 |
0.0056 |
Measurement Method: Electrical measurements
"Resistivity and Hall measurements were performed in helium-flow cryostats operating over a temperature range from 300 K to 2 K and controlled with a Lakeshore DRC-91C temperature controller. A Cryo Industries model RC152 cryostat was used for most of the resistivity measurements. A Janis SuperVariTemp cryostat with a 9 T superconducting magnet was used for Hall and some resistivity measurements. In both systems temperatures were measured with carbon-glass sensors in close thermal contact with the sample holder. A Keithley 220 current source and a Keithley 182 nonovoltmeter were used for the electrical measurements. Electrical contacts of less than 2 Ω resistance were established by baking DuPont 6383 silver epoxy onto the sample for 20 min at 600 °C in an oxygen environment, followed by curing an epoxy link from the contact pad to a copper wire for 45 min at 200 °C. The copper wires were secured with GE 7031 varnish to thermally conducting posts imbedded in the brass sample holder... a five pin miniature gold connector was located near the sample holder in an isothermal brass container exposed to the same gas flow as the sample holder. ... Thermoelectric voltages were canceled by reversing the current 10 times per second, typically for 10 s, and averaging the signal appropriately. ... Hall measurements consisted of at least three to five field-reversed pairs at each temperature and were usualy reproducibe to within 1 % or 2 %."
Cautions: Evaluated Data
Resistivity in the ab-plane was determined. Values were obtained at zero field. Digitized data were obtained from Figure 7 of the paper.
Hall Coefficient for Bi:221; [Bi-Sr-Cu-O]
| Temperature (K) |
Hall Coefficient (mm3 /C) |
| 2 |
2.34 |
| 6 |
2.28 |
| 15 |
2.28 |
| 26 |
2.31 |
| 52 |
2.34 |
| 75 |
2.34 |
| 95 |
2.28 |
| 118 |
2.28 |
| 135 |
2.21 |
| 167 |
2.18 |
Measurement Method: Electrical measurements
"Resistivity and Hall measurements were performed in helium-flow cryostats operating over a temperature range from 300 K to 2 K and controlled with a Lakeshore DRC-91C temperature controller. A Cryo Industries model RC152 cryostat was used for most of the resistivity measurements. A Janis SuperVariTemp cryostat with a 9 T superconducting magnet was used for Hall and some resistivity measurements. In both systems temperatures were measured with carbon-glass sensors in close thermal contact with the sample holder. A Keithley 220 current source and a Keithley 182 nonovoltmeter were used for the electrical measurements. Electrical contacts of less than 2 Ω resistance were established by baking DuPont 6383 silver epoxy onto the sample for 20 min at 600 °C in an oxygen environment, followed by curing an epoxy link from the contact pad to a copper wire for 45 min at 200 °C. The copper wires were secured with GE 7031 varnish to thermally conducting posts imbedded in the brass sample holder... a five pin miniature gold connector was located near the sample holder in an isothermal brass container exposed to the same gas flow as the sample holder. ... Thermoelectric voltages were canceled by reversing the current 10 times per second, typically for 10 s, and averaging the signal appropriately. ... Hall measurements consisted of at least three to five field-reversed pairs at each temperature and were usualy reproducibe to within 1 % or 2 %."
Cautions: Evaluated Data
The Hall coefficient in the ab-plane was determined in a magnetic field of 9 T. Digitized data were obtained from Figure 8 of the paper.
