Material Specification for Y:124; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "2.12 g of Y(CH3COO)3•4H2O (Mitsuwa Pure Chemicals, Osaka, Japan), 3.20 g of Ba(CH3COO)2 (Wake Pure Chemicals, Osaka, Japan), and 4.56 g of Cu(CH3COO)2 (Wako Pure Chemicals) were dissolved in 200 mL distilled water and then the solution was stirred for 1 h at room temperature. After addition of 1.620 g of tartaric acid dissolved in 10 mL distilled water, the aqueous solution was stirred for 2 h. The molar ratio of C4H6O6/Cu was fixed at 0.43/1. The resultant transparent aqueous solution with blue color was kept in a furnace at 80 °C for three days to be gelled. The dried gel was pulverized in an agate mortar....the gel powder was heated at 780 °C for... 30 h in O2 and then pressed into a pellet. The pellet was sintered at 780 °C for various hours in flowing oxygen. Sintering in air was also performed."
Formula: YBa2Cu4O8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Y:124; [Y-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.846 |
3.871 |
27.22 |
Measurement Method: X-ray diffraction
"Crystalline phases... were identified by the powder x-ray diffraction method with a Rigaku Denki Company model RAD-IIA diffractometer using CuKα radiation."
Cautions: Evaluated Data
Critical Temperature for Y:124; [Y-Ba-Cu-O]
| Tc(onset) (K) |
Critical Temperature (K) |
| 85 |
75 |
Measurement Method: Electrical resistance
"Temperature dependence of the DC electrical resistance" was determined.
Cautions: Unevaluated Data
No measurement details were noted.
Resistivity (normal state) for Y:124; [Y-Ba-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 75 |
0.0 |
| 78 |
0.3 |
| 81 |
1.1 |
| 85 |
2.0 |
| 88 |
2.2 |
| 103 |
2.5 |
| 113 |
2.6 |
| 121 |
2.7 |
Measurement Method: Electrical resistance
"Temperature dependence of the DC electrical resistance" was determined.
Cautions: Unevaluated Data
No measurement details were noted.
Digitized data were obtained from Figure 5b of the paper.
