Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: The authors cite P. Biswas et al., Mater. Lett., Vol. 8, 233-237 (1989), and summarize the procedure as follows. "A solution mixture of the nitrates of yttrium, barium, and copper was atomized, dried in a silica gel diffusion dryer, and then decomposed in a three-zone temperature-controlled furnace. The diffusion dryer ensured that the particles were nearly totally dried... As atomization was the technique used, a rather broad size spectrum of particles was produced, with the mean size of the distribution being dependent on the solution concentration in the atomizer... To obtain particles in narrower size ranges, the particles were further classified by size. Different techniques such as sieves and particle trap impactors can be used."
Formula: YBa2Cu3O7-x
Informal Name: Y:123
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:
Critical Flux Density Hc2 for Y:123; [Y-Ba-Cu-O]
| Particle Size (µm) |
Temperature (K) |
Crit.Mag.Flux Density Hc2 (T) |
| 0.55 |
80.1 |
0.93 |
| 0.55 |
80.2 |
0.87 |
| 0.55 |
80.5 |
0.66 |
| 0.55 |
81.0 |
0.48 |
| 0.55 |
81.3 |
0.49 |
| 0.55 |
81.5 |
0.29 |
| 0.55 |
82.0 |
0.26 |
| 0.55 |
82.5 |
0.00 |
| 1.25 |
78.0 |
1.13 |
| 1.25 |
78.5 |
1.06 |
| 1.25 |
79.0 |
0.68 |
| 1.25 |
79.8 |
0.60 |
| 1.25 |
81.0 |
0.31 |
| 1.25 |
82.0 |
0.00 |
Measurement Method: Vibrating sample magnetometer
"Magnetization measurements were performed on the size-classified powders. A vibrating sample magnetometer (model 4500, EG & G Princeton Applied Research, Trenton, NJ) was used to measure the magnetic moment, M, of a 60- to 90-mg sample as a function of the applied field, H. Typically an encapsulated sample in a Kel-F (3M, St. Paul, MN) holder was suspended at the end of a long vibrating rod centered between the poles of a magnet and constrained to vibrate along the vertical axis. A signal proportional to the magnetization of the superconducting specimen was sensed by the pickup coils, digitized, and stored in a computer... Operatively, we define H
as the value of the applied field, H, at which the slope of the M-H curve changes its sign (from negative to positive)... H
... is the field strength at which the induced moment, M, becomes zero... The coherence length is related to H
..."
Cautions: Evaluated Data
Digitized data were obtained from Figure 6 of the paper.
Coherence Length for Y:123; [Y-Ba-Cu-O]
| Particle Size (µm) |
Temperature (K) |
Coherence Length (σ) |
| 0.275 |
13 |
42.5 |
| 0.55 |
13 |
35.8 |
| 1.25 |
13 |
38.2 |
Measurement Method: Vibrating sample magnetometer
"Magnetization measurements were performed on the size-classified powders. A vibrating sample magnetometer (model 4500, EG & G Princeton Applied Research, Trenton, NJ) was used to measure the magnetic moment, M, of a 60- to 90-mg sample as a function of the applied field, H. Typically an encapsulated sample in a Kel-F (3M, St. Paul, MN) holder was suspended at the end of a long vibrating rod centered between the poles of a magnet and constrained to vibrate along the vertical axis. A signal proportional to the magnetization of the superconducting specimen was sensed by the pickup coils, digitized, and stored in a computer... Operatively, we define H
as the value of the applied field, H, at which the slope of the M-H curve changes its sign (from negative to positive)... H
... is the field strength at which the induced moment, M, becomes zero... The coherence length is related to H
..."
Cautions: Evaluated Data
Critical Flux Density Hc1 for Y:123; [Y-Ba-Cu-O]
| Particle Size (µm) |
Temperature (K) |
Crit.Mag.Flux Density Hc1 (mT) |
| 0.275 |
13 |
204 |
| 0.55 |
13 |
185 |
| 1.25 |
13 |
160 |
Measurement Method: Vibrating sample magnetometer
"Magnetization measurements were performed on the size-classified powders. A vibrating sample magnetometer (model 4500, EG & G Princeton Applied Research, Trenton, NJ) was used to measure the magnetic moment, M, of a 60- to 90-mg sample as a function of the applied field, H. Typically an encapsulated sample in a Kel-F (3M, St. Paul, MN) holder was suspended at the end of a long vibrating rod centered between the poles of a magnet and constrained to vibrate along the vertical axis. A signal proportional to the magnetization of the superconducting specimen was sensed by the pickup coils, digitized, and stored in a computer... Operatively, we define H
as the value of the applied field, H, at which the slope of the M-H curve changes its sign (from negative to positive)... H
... is the field strength at which the induced moment, M, becomes zero... The coherence length is related to H
..."
Cautions: Evaluated Data
