Material Specification for CaLa:123; [Ca-La(Ba)-Cu-O]
Process: Solid State Reaction
Notes: "Samples were prepared by thoroughly mixing and grinding La2O3, BaCO3, CaCO3, and CuO powder in the stoichiometric ratio and firing at 950 °C in air for 24 hours. The samples were reground and refired at this same temperature to improve the homogeneity. The final annealing was in oxygen flow at 400 °C for 2 hours. ... X-ray powder diffraction showed the presence of only small amounts of CaCuO2 as an impurity phase. The oxygen content was determined by a gravimetric procedure by heating the samples in hydrogen at 950 °C..."
Formula: CaLaBaCu3O6.85
Informal Name: CaLa:123
Chemical Family: Ca-La(Ba)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Resistivity (normal state) for CaLa:123; [Ca-La(Ba)-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 45 |
0.0 |
| 74 |
0.0 |
| 76 |
1.4 |
| 82 |
2.7 |
| 123 |
3.1 |
| 164 |
3.5 |
| 203 |
3.9 |
| 245 |
4.2 |
| 286 |
4.5 |
Measurement Method: Four-probe method
"Resistance measurements were carried out in a closed-cycle refrigerator in the temperature range between 12 K and 300 K. A standard DC, four-probe technique was used. Data were corrected for thermovoltages in wiring and contacts. To determine the resistivity, rectangular bars were cut out of the ceramic pellets with a diamond saw."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Magnetic Susceptibility for CaLa:123; [Ca-La(Ba)-Cu-O]
| Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 4 |
-2.5 |
| 17 |
-2.5 |
| 29 |
-2.4 |
| 42 |
-2.3 |
| 49 |
-2.0 |
| 60 |
-1.2 |
| 64 |
-0.5 |
| 70 |
0.0 |
| 79 |
0.0 |
Measurement Method: Ac susceptibility
"AC-susceptibility measurements were performed in a
4He-cryostat using a mutual inductance technique. A driving field frequency of 87 Hz and amplitudes of (34 A/m = 0.43 Oe) and (87.5 A/m = 1.1 Oe) were used."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
