Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "The samples... studied here for three different oxygen concentrations... all originate from the same high quality single crystal with mass 10 mg and approximate dimensions 2 x 1 x 0.5 µm3. This crystal was grown by heating a stoichiometric mixture of the oxide powders to 980 °C and then lowering the temperature to 800 °C at a rate of 1 °C/h. ...(A sample) with approximate dimensions ...100 x 100 x 30 µm3 and 2 µg mass (was) removed from the large 10 mg single crystal (crystal #1)....To increase its oxygen content, (the) large crystal was annealed for 12 h in flowing oxygen at 600 °C and the increase of mass determined by a thermograviometric balance. ... A small 2 µg
sample was then removed from this large 10 mg oxygenated crystal for use in the pressure experiment (crystal #2...) Finally, to reduce the oxygen content, the large oxygenated crystal was annealed for 2 h in high vacuum and thus deoxygenated... A... 3 µg sample... was selected... (crystal #3...)"
Formula: Bi2Sr2CaCu2Ox
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:
Production Form:
Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Crystal Number () |
x of Ox (formula units) |
Pressure (GPa) |
Critical Temperature (K) |
| 1 |
8.18 |
0.0 |
88 |
| 1 |
8.18 |
1.5 |
90 |
| 1 |
8.18 |
2.6 |
84 |
| 1 |
8.18 |
4.0 |
76 |
| 1 |
8.18 |
4.9 |
73 |
| 1 |
8.18 |
5.8 |
69 |
| 1 |
8.18 |
6.9 |
67 |
| 2 |
8.22 |
0.0 |
80 |
| 2 |
8.22 |
1.7 |
82 |
| 2 |
8.22 |
3.6 |
84 |
| 2 |
8.22 |
4.8 |
83 |
| 2 |
8.22 |
5.6 |
76 |
| 2 |
8.22 |
7.2 |
53 |
| 3 |
8.05 |
0.0 |
51 |
| 3 |
8.05 |
1.6 |
51 |
| 3 |
8.05 |
2.6 |
44 |
| 3 |
8.05 |
3.2 |
37 |
| 3 |
8.05 |
3.4 |
36 |
| 3 |
8.05 |
4.1 |
36 |
| 3 |
8.05 |
4.9 |
35 |
| 3 |
8.05 |
6.2 |
32 |
Measurement Method: T
c measurement
The authors indicate that critical temperatures were determined using: a SQUID magnetometer in a field of 1.2 µT (12 mG) for crystal #1; a SQUID magnetometer in a field of 100 µT (1 G) for crystal #2; and AC susceptibility for crystal #3 using the coil system of the pressure cell. "In the present experiment high hydrostatic pressures are generated in a diamond-anvil cell utilizing 1/6-carat type I diamonds with 0.5 mm culet diameter and gaskets made of Ta
90W
10 alloy which are 300 µm thick, preindented to 130 µm, and provided with a 250 µm dia. bore. High density helium is used as pressure medium... The superconducting transition is detected inductively using a miniature coil system consisting of primary (field) and secondary (pick-up) coils of 5 mm and 3.5 mm I.D., respectively."
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
