Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: The authors cite S. Reich et al., J. Appl. Phys., Vol. 68, 668 (1990), and summarize the procedure as follows. "Ceramic pellets of YBCO and YBCO-Ag (23 wt.%) nonrandom composite were made at the Weizmann Institute. The samples have a cylindrical shape, with diameter and length approximately 5 mm, masses around 0.5 g, and were sintered overnight with an oxygen atmosphere at 900 °C for YBCO-Ag and 940 °C for pure YBCO... X-ray diffraction data revealed the expected orthorhombic phase of YBCO in both samples. Silver lines were clearly observed as a separate phase in YBCO-Ag... From the values of the c-axis we estimate the oxygen content (7-δ) = 6.81±0.02 for pure YBCO and 6.84±0.02 for YBCO-Ag, which is approximately the same for both samples within the precision of the method."
Formula: YBa2Cu3O6.81
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name:
Production Date:
Lot Number:
Production Form:
Grain Size Distribution for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Minimum Grain size (µm) |
Maximum Grain size (µm) |
Grain Size (µm) |
| 296 |
1 |
50 |
25 |
Measurement Method: Scanning electron microscope
"... SEM... revealed well compacted YBCO grains in the reference material, with dimensions varying from 1 to 50 µm. It appears that a significant grain growth has occurred on sintering pure YBCO. In YBCO-Ag we have observed a more uniform grain size distribution; the average grain size was smaller, with a maximum value of approximately 10 µm. The increased porosity of the composite sample was readily identified in SEM, in accordance with the measured mass densities." No additional measurement details were noted.
Cautions: Evaluated Data
Density (mass) for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Relative Density (% theoretic) |
Density (g cm-3) |
| 296 |
92 |
5.90 |
Measurement Method: Density measurement
Cautions: Unevaluated Data
No measurement details were noted.
Resistivity (normal state) for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 92.8 |
0.00 |
| 93.1 |
0.04 |
| 93.3 |
0.18 |
| 93.5 |
0.47 |
| 93.8 |
0.66 |
| 94.5 |
0.72 |
| 95.8 |
0.77 |
Measurement Method: Four-probe method
"Electrical resistivity measurements were carried out at UFRGS, in the interval from 300 K to below the transition temperature T
c. A standard AC four terminal technique was used, with (low) current densities, in the range of 0.07 to 0.007 A/cm
2. The temperature was determined with a Pt thermometer, with a resolution of 2-3 mK. The precision of the results is a few parts in 10
5, limited by noise in the pressed CuBe contacts. Absolute values of the resistivity are accurate to within 10%, due to uncertainties in the geometrical factors."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Specific Heat for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 65 |
122 |
| 76 |
156 |
| 84 |
175 |
| 91 |
196 |
| 92 |
190 |
| 100 |
206 |
| 108 |
227 |
| 118 |
247 |
Measurement Method: Adiabatic heat pulse
"The specific heat was measured at UFRJ in the temperature range from 4.2 K to 180 K, using an adiabatic pulse technique. The sample sensor was a grounded carbon resistor, recalibrated at each run. An AC bridge connected to a microcomputer recorded the variation of the resistance of the sample sensor for each individual data point... The addenda heat capacity was measured separately and subtracted; its contribution to the total heat capacity varied around 30%... the estimated absolute accuracy is within ±3% to 5%."
Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.
Material Specification for Y:123; [Y-Ba-Cu-O:Ag]
Process: Solid State Reaction
Notes: The authors cite S. Reich et al., J. Appl. Phys., Vol. 68, 668 (1990), and summarize the procedure as follows. "Ceramic pellets of YBCO and YBCO-Ag (23 wt.%) nonrandom composite were made at the Weizmann Institute. The samples have a cylindrical shape, with diameter and length approximately 5 mm, masses around 0.5 g, and were sintered overnight with an oxygen atmosphere at 900 °C for YBCO-Ag and 940 °C for pure YBCO... X-ray diffraction data revealed the expected orthorhombic phase of YBCO in both samples. Silver lines were clearly observed as a separate phase in YBCO-Ag... From the values of the c-axis we estimate the oxygen content (7-δ) = 6.81±0.02 for pure YBCO and 6.84±0.02 for YBCO-Ag, which is approximately the same for both samples within the precision of the method."
Formula: YBa2Cu3O6.84•23wt%Ag
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O:Ag
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Grain Size Distribution for Y:123; [Y-Ba-Cu-O:Ag]
| Temperature (K) |
Minimum Grain size (µm) |
Maximum Grain size (µm) |
Grain Size (µm) |
| 296 |
1 |
10 |
5 |
Measurement Method: Scanning electron microscope
"... SEM... revealed well compacted YBCO grains in the reference material, with dimensions varying from 1 to 50 µm. It appears that a significant grain growth has occurred on sintering pure YBCO. In YBCO-Ag we have observed a more uniform grain size distribution; the average grain size was smaller, with a maximum value of approximately 10 µm. The increased porosity of the composite sample was readily identified in SEM, in accordance with the measured mass densities." No additional measurement details were noted.
Cautions: Evaluated Data
Density (mass) for Y:123; [Y-Ba-Cu-O:Ag]
| Temperature (K) |
Relative Density (% theoretic) |
Density (g cm-3) |
| 296 |
80 |
5.85 |
Measurement Method: Density measurement
Cautions: Unevaluated Data
No measurement details were noted.
Resistivity (normal state) for Y:123; [Y-Ba-Cu-O:Ag]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 91.8 |
0.00 |
| 92.6 |
0.02 |
| 93.2 |
0.04 |
| 93.6 |
0.06 |
| 94.1 |
0.07 |
| 96.0 |
0.07 |
Measurement Method: Four-probe method
"Electrical resistivity measurements were carried out at UFRGS, in the interval from 300 K to below the transition temperature T
c. A standard AC four terminal technique was used, with (low) current densities, in the range of 0.07 to 0.007 A/cm
2. The temperature was determined with a Pt thermometer, with a resolution of 2-3 mK. The precision of the results is a few parts in 10
5, limited by noise in the pressed CuBe contacts. Absolute values of the resistivity are accurate to within 10%, due to uncertainties in the geometrical factors."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 inset of the paper.
Specific Heat for Y:123; [Y-Ba-Cu-O:Ag]
| Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 61 |
67 |
| 71 |
84 |
| 80 |
94 |
| 94 |
110 |
| 107 |
126 |
| 120 |
138 |
Measurement Method: Adiabatic heat pulse
"The specific heat was measured at UFRJ in the temperature range from 4.2 K to 180 K, using an adiabatic pulse technique. The sample sensor was a grounded carbon resistor, recalibrated at each run. An AC bridge connected to a microcomputer recorded the variation of the resistance of the sample sensor for each individual data point... The addenda heat capacity was measured separately and subtracted; its contribution to the total heat capacity varied around 30%... the estimated absolute accuracy is within ±3% to 5%."
Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.
