Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Sintering
Notes: The authors cite C.Y. Chu, Superconductor Science and Technology, Vol. 5, 306 (1992), and summarize the procedure as follows. The 2212 powder was synthesized from a mixture of Bi2O3, SrCO3, CaCO3 and CuO. The actual composition was Bi2Sr1.7CaCu2Ox, which yields 2212 of good phase purity. The 2212 powder was processed into bars by sinter forging in air at about 845 °C under compression rates of 0.005-0.01 mm min-1. Ag foil separated the 2212 from the Al2O3 compression rams. The final stress on each bar was about 6 MPa... The specimens were 87-92% dense... Following forging, some of the specimens were sintered in air for 100 h at about 860 °C. ... Specimens were cut from the bars with a slow-speed diamond-blade saw."
Formula: Bi2Sr2CaCu2Ox
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:
Flexural Strength for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Maximum Strength (MPa) |
Flexural Strength (MPa) |
| 296 |
100 |
84 ± 14 |
Measurement Method: Strength tests
"Four-point bending tests were conducted in one orientation only. For compression tests, the predominant grain orientation was parallel, at 45°, or perpendicular to the compression axis. For the four-point bending tests, the tensile surfaces were polished to a 1 µm finish and bevelled to limit edge cracking. Average specimen cross sections were 3 mm on a side. The inner and outer load spans were 9.6 mm and 19.2 mm respectively. For the compression tests, average specimens were 3-6 mm in height and 3 mm along a side. Ag foil was placed on each face being loaded and, to minimize frictional effects, oil was applied between the Ag and the compression rams. Testing was conducted at room temperature at a rate of 2.54 mm min
-1. Four to seven specimens were tested in each configuration."
Cautions: Evaluated Data
