Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "... samples were prepared by the standard ceramic method... The powder for the Y sample was prereacted three times for 32 h in air with intermediate regrinding in a ball mill. It was pressed into pellets and sintered in an alumina crucible at 925 °C for 50 h in slowly flowing oxygen. Then the sample was slowly cooled to room temperature... Scanning electron microscopy (SEM)... revealed two kinds of grains: The bigger ones have an average size of 20 µm, while the smaller ones have only 5 µm... The powder for the Dy sample was also prereacted threefold (20 h at 950 °C in air). The pellets were sintered for 20 h at 950 °C in flowing oxygen... SEM of this sample... revealed grains near 25 µm..."
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 Temperature for Y:123; [Y-Ba-Cu-O]
| Tc onset (K) |
Critical Temperature (K) |
| 92.7 |
91.8 |
Measurement Method: Electrical resistance
Cautions: Unevaluated Data
No measurement details were noted. The authors indicated that T
c was evaluated as the zero resistance temperature.
Specific Heat for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 22 |
10 |
| 56 |
98 |
| 94 |
197 |
| 152 |
295 |
| 203 |
360 |
| 251 |
391 |
| 300 |
417 |
Measurement Method: Calorimetry
"With our calorimeter, the specific heat can be measured by two independent methods: the quasiadiabatic continuous method and the classical heat pulse method. For the first method a constant heater power is supplied to the sample while the sample temperature is registered continuously... The relative resolution of the method is about 5 x 10
-4 at a typical heating rate of 10 mK/s. Alternatively, we can also use the quasi-adiabatic heat pulse technique which gives at best a resolution of 2 x 10
-3 when using steps of 100 mK height. Both methods have an absolute accuracy of 1-3%, depending on the mass of the sample. The first method is able to measure the specific heat quickly and accurately over the temperature range from 20-300 K, while the second method allows a closer inspection around phase transitions. All calorimetric measurements are performed in high vacuum."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Thermal Expansion for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Thermal Expansion (10-6 K-1) |
| 5 |
0.1 |
| 13 |
0.6 |
| 29 |
0.8 |
| 62 |
3.1 |
| 102 |
5.9 |
| 150 |
8.0 |
| 201 |
9.8 |
| 250 |
11.1 |
Measurement Method: Capacitive dilatometer
The authors cite R. Pott et al., J. Phys. E, Vol. 16, 444 (1983), and summarize the procedure as follows. "Linear thermal expansion measurements were performed in an improved version of a capacitive dilatometer... Around 100 K, the linear thermal expansion coefficient can be measured with a relative accuracy of 2-3 x 10
-8 and with an absolute accuracy of 2%... The samples were mounted in the dilatometer with the measurement axis perpendicular to the pressing direction of the original powder."
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.
Material Specification for Dy:123; [Dy-Ba-Cu-O]
Process: Solid State Reaction
Notes: "... samples were prepared by the standard ceramic method... The powder for the Y sample was prereacted three times for 32 h in air with intermediate regrinding in a ball mill. It was pressed into pellets and sintered in an alumina crucible at 925 °C for 50 h in slowly flowing oxygen. Then the sample was slowly cooled to room temperature... Scanning electron microscopy (SEM)... revealed two kinds of grains: The bigger ones have an average size of 20 µm, while the smaller ones have only 5 µm... The powder for the Dy sample was also prereacted threefold (20 h at 950 °C in air). The pellets were sintered for 20 h at 950 °C in flowing oxygen... SEM of this sample... revealed grains near 25 µm..."
Formula: DyBa2Cu3O7-x
Informal Name: Dy:123
Chemical Family: Dy-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Critical Temperature for Dy:123; [Dy-Ba-Cu-O]
| Tc onset (K) |
Critical Temperature (K) |
| 92.4 |
91.8 |
Measurement Method: Electrical resistance
Cautions: Unevaluated Data
Specific Heat for Dy:123; [Dy-Ba-Cu-O]
| Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 26 |
20 |
| 59 |
106 |
| 103 |
202 |
| 152 |
272 |
| 202 |
328 |
| 250 |
358 |
| 300 |
378 |
Measurement Method: Calorimetry
"With our calorimeter, the specific heat can be measured by two independent methods: the quasiadiabatic continuous method and the classical heat pulse method. For the first method a constant heater power is supplied to the sample while the sample temperature is registered continuously... The relative resolution of the method is about 5 x 10
-4 at a typical heating rate of 10 mK/s. Alternatively, we can also use the quasi-adiabatic heat pulse technique which gives at best a resolution of 2 x 10
-3 when using steps of 100 mK height. Both methods have an absolute accuracy of 1-3%, depending on the mass of the sample. The first method is able to measure the specific heat quickly and accurately over the temperature range from 20-300 K, while the second method allows a closer inspection around phase transitions. All calorimetric measurements are performed in high vacuum."
Cautions: Evaluated Data
Thermal Expansion for Dy:123; [Dy-Ba-Cu-O]
| Temperature (K) |
Thermal Expansion (10-6 K-1) |
| 15 |
0.1 |
| 49 |
2.0 |
| 100 |
4.7 |
| 151 |
7.1 |
| 203 |
8.8 |
| 248 |
10.0 |
| 250 |
10.0 |
Measurement Method: Capacitive dilatometer
The authors cite R. Pott et al., J. Phys. E, Vol. 16, 444 (1983), and summarize the procedure as follows. "Linear thermal expansion measurements were performed in an improved version of a capacitive dilatometer... Around 100 K, the linear thermal expansion coefficient can be measured with a relative accuracy of 2-3 x 10
-8 and with an absolute accuracy of 2%... The samples were mounted in the dilatometer with the measurement axis perpendicular to the pressing direction of the original powder."
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.
