Material Specification for Bi:2223; [Bi(Pb)-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Superconducting powder... was prepared by a solid-state reaction. Appropriate amounts of Bi2O3, PbO, SrCO3, CaCO3, and CuO of high purity (99.9%) were wet-mixed in ethanol and calcined at about 800 °C. The sample was ground, pressed, and heated at 850 °C, cooled to room temperature in a furnace, and finally ground. This process (from pressing to grinding) was repeated several times to ensure a complete solid-state reaction. The total firing time was about 50 h. All firing was done in air. The superconducting powder was uniaxially cold-pressed at (19.6 MPa = 200 kgf/cm2). Then the compact body was hot-pressed at 800 °C at pressures from (4.9 MPa = 50 kgf/cm2) to (19.6 MPa) in air for 2 h... The hot-pressed blocks were cut into specimens in two different manners... and were machined into rectangular bars of 3 mm X 4 mm X 20 mm with a diamond abrasive wheel."
Formula: Bi1.84Pb0.34Sr2.03Ca1.9Cu3.06Ox
Informal Name: Bi:2223
Chemical Family: Bi(Pb)-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Density (mass) for Bi:2223; [Bi(Pb)-Sr-Ca-Cu-O]
| Density (g cm-3) |
| 5.7 ± 0.1 |
Measurement Method: Archimedes method
"The bulk density of each specimen was measured by the Archimedes method after the surface of the specimen was coated with paraffin."
Cautions: Evaluated Data
Flexural Strength for Bi:2223; [Bi(Pb)-Sr-Ca-Cu-O]
| Temperature (K) |
Flexural Strength (MPa) |
| 80 |
113 ± 5 |
| 100 |
119 ± 4 |
| 120 |
116 ± 4 |
| 180 |
113 ± 5 |
| 240 |
109 ± 4 |
| 292 |
105 ± 3 |
Measurement Method: Three-point bend
"The three-point bending test was carried out in air at a crosshead speed of 0.5 mm/min and a lower span of 16 mm. A load was applied to the plane with a specimen width of 3 mm... There were 5-8 specimens for one condition."
Cautions: Evaluated Data
"When the fractured surface was parallel to the hot-pressing direction, the flexural strength when the crack propagated perpendicularly to the hot-pressing direction was higher than that when the crack propagated parallel to the hot-pressing direction. That is, anisotropy in mechanical strength was observed, which seemed to be due to the grain-oriented microstructure." Digitized data were obtained from Figure 5 of the paper.
