Material Specification for Y:123; [Y-Ba-Cu-O:Ag]
Process: Solid State Reaction
Notes: "The Y123 powder was prepared by the solid-state reaction of the constitutent oxides Y2O3, CuO and BaO. Powdered Y2O3, CuO and BaCO3 were mixed in appropriate proportions and ball milled in ethyl alcohol for 24 h using zirconia balls as the grinding medium. The slurry was dried with a rotary evaporator. The powder mixtures were then calcined at 950 °C for 12 h, and annealed at 480 °C for 8 h in a flowing oxygen atmosphere. The calcined lumps were ball milled in ethyl alcohol for 24 h. The slurry was allowed to settle for 10 min and the suspension was collected and then dried. The dried lumps were crushed and passed through a plastic sieve with aperture size 0.074 mm. The average particle size of the resulting Y123 powder was 0.92 µm. The Y123/Ag composites were prepared by ball milling various amounts of Ag2O with the Y123 powder for 24 h. The resulting composition contained 5-20 vol% Ag after sintering. The powder mixtures were dried and sieved. Specimens, 1 cm diameter and 0.3-0.4 cm high, were prepared by uniaxially pressing at 200 MPa in a steel mould. The samples were sintered in a flowing oxygen atmosphere in the temperature range 900-950 °C and then annealed at 480 °C. The samples were heated slowly to 350 °C at a heating rate of 0.5 °C/min. The specimens were held at that temperature for 3 h. The heating rate between 350 °C and the sintering temperature was 5 °C/min. The cooling rate between the sintering temprature and 480 °C was 3 °C/min. After annealing at 480 °C for 8 h, the samples were cooled to room temperature at 2 °C/min."
Formula: YBa2Cu3O7-x•yAg
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:
Hardness for Y:123; [Y-Ba-Cu-O:Ag]
| Sintering Temperature (°C) |
Sintering Time (min) |
Relative Density (%) |
Volume Fraction of Ag (%) |
Hardness (GPa) |
| 900 |
360 |
65.1 |
0 |
1.13 |
| 900 |
360 |
70.6 |
5 |
1.51 |
| 900 |
360 |
65.6 |
10 |
1.45 |
| 900 |
360 |
70.2 |
15 |
1.79 |
| 900 |
360 |
64.3 |
20 |
1.55 |
| 920 |
360 |
74.2 |
0 |
2.51 |
| 920 |
360 |
81.6 |
5 |
1.76 |
| 920 |
360 |
83.7 |
10 |
1.81 |
| 920 |
360 |
84.5 |
15 |
2.15 |
| 920 |
360 |
86.2 |
20 |
2.34 |
| 930 |
360 |
79.9 |
0 |
3.31 |
| 930 |
360 |
84.5 |
5 |
3.55 |
| 930 |
360 |
86.0 |
10 |
2.87 |
| 930 |
360 |
86.6 |
15 |
2.67 |
| 930 |
360 |
89.1 |
20 |
2.57 |
| 940 |
360 |
86.7 |
0 |
4.35 |
| 940 |
360 |
90.8 |
5 |
4.02 |
| 940 |
360 |
89.9 |
10 |
3.11 |
| 940 |
360 |
90.2 |
15 |
2.92 |
| 950 |
360 |
88.2 |
0 |
4.14 |
| 950 |
360 |
88.4 |
5 |
3.83 |
| 950 |
360 |
88.0 |
10 |
3.06 |
| 930 |
1 |
65.6 |
0 |
1.05 |
| 930 |
1 |
73.5 |
5 |
1.42 |
| 930 |
1 |
70.2 |
10 |
1.21 |
| 930 |
1 |
69.6 |
15 |
1.03 |
| 930 |
1 |
62.6 |
20 |
0.65 |
| 930 |
10 |
67.1 |
0 |
1.54 |
| 930 |
10 |
75.1 |
5 |
1.60 |
| 930 |
10 |
71.1 |
10 |
1.48 |
| 930 |
10 |
71.5 |
15 |
1.16 |
| 930 |
10 |
63.2 |
20 |
0.96 |
| 930 |
100 |
74.3 |
0 |
2.43 |
| 930 |
100 |
75.4 |
5 |
2.27 |
| 930 |
100 |
80.0 |
10 |
2.29 |
| 930 |
100 |
81.5 |
15 |
2.21 |
| 930 |
100 |
88.5 |
20 |
2.45 |
| 930 |
1000 |
94.1 |
0 |
4.54 |
| 930 |
1000 |
90.2 |
5 |
3.98 |
| 930 |
1000 |
90.7 |
15 |
2.78 |
| 930 |
1000 |
90.4 |
20 |
2.64 |
| 930 |
5000 |
95.7 |
0 |
4.65 |
| 930 |
5000 |
90.5 |
5 |
3.57 |
| 930 |
5000 |
91.4 |
10 |
3.18 |
| 930 |
5000 |
94.0 |
15 |
3.17 |
| 930 |
5000 |
93.5 |
20 |
2.85 |
Measurement Method: Vickers indentation
"Indentation was performed with a Vickers microhardness tester (MS-55, Akashi Co., Japan). To determine hardness, a 1 N load wa applied. For fracture toughness, a 10 N load was applied to obtain long, clear cracks. The relationship proposed by Anstis et al., J. Amer. Ceram. Soc., Vol. 55, 109 (1972)
K
Ic = 0.016 (E/H)
0.5 (P/c
1.5)
was used to calculate values of fracture toughness, K
, where E is the elastic modulus, H the hardness, P the load applied and c the average radial crack length."
Cautions: Evaluated Data
Fracture Toughness for Y:123; [Y-Ba-Cu-O:Ag]
| Sintering Temperature (°C) |
Sintering Time (min) |
Relative Density (%) |
Volume Fraction of Ag (%) |
Fracture Toughness (MPa·m1/2) |
| 920 |
360 |
86.2 |
20 |
2.4 |
| 930 |
360 |
86.6 |
15 |
2.2 |
| 930 |
360 |
89.1 |
20 |
2.7 |
| 940 |
360 |
86.7 |
0 |
1.1 |
| 940 |
360 |
90.8 |
5 |
1.5 |
| 940 |
360 |
89.9 |
10 |
2.1 |
| 940 |
360 |
90.2 |
15 |
2.4 |
| 950 |
360 |
88.2 |
0 |
1.1 |
| 950 |
360 |
88.4 |
5 |
1.4 |
| 950 |
360 |
88.0 |
10 |
1.8 |
| 930 |
100 |
88.5 |
20 |
2.6 |
| 930 |
1000 |
94.1 |
0 |
1.1 |
| 930 |
1000 |
90.2 |
5 |
1.5 |
| 930 |
1000 |
90.7 |
15 |
2.4 |
| 930 |
1000 |
90.4 |
20 |
2.8 |
| 930 |
5000 |
95.7 |
0 |
1.2 |
| 930 |
5000 |
90.5 |
5 |
1.4 |
| 930 |
5000 |
91.4 |
10 |
1.9 |
| 930 |
5000 |
94.0 |
15 |
2.0 |
| 930 |
5000 |
93.5 |
20 |
2.3 |
Measurement Method: Vickers indentation
"Indentation was performed with a Vickers microhardness tester (MS-55, Akashi Co., Japan). To determine hardness, a 1 N load wa applied. For fracture toughness, a 10 N load was applied to obtain long, clear cracks. The relationship proposed by Anstis et al., J. Amer. Ceram. Soc., Vol. 55, 109 (1972)
K
Ic = 0.016 (E/H)
0.5 (P/c
1.5)
was used to calculate values of fracture toughness, K
Ic, where E is the elastic modulus, H the hardness, P the load applied and c the average radial crack length."
Cautions: Evaluated Data
The values of the elastic modulus used to calculate fracture toughness values were not noted.
