Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "YBa2Cu3Ox was prepared by mixing BaCO3, Y2O3 and CuO in stoichiometric proportions and firing at 900 °C for 10 h. The material was then ground in ethanol in a vibro energy mill to a surface area of approximately 3 m2 g-1. The slurry was dried in a rotary evaporator and the resulting powder was thoroughly mixed with polymer and non-aqueous solvent until a plastic dough resulted. This plastic mixture was then extruded in a ram extruder to form a tube 40 mm in internal diameter with a wall thickness of 2 mm. The tube formed the cavity resonator with end caps made by pressing flat sheets of the plastic mixture. The articles were then sintered in a silica tube furnace in flowing oxygen to a temperature of 920 °C and cooled at a rate of 1 °C min-1. Annealing was carried out at 400-500 °C before final cooling at 1°C min-1 to 50-60 °C."
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:
Surface Resistance for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Surface Resistance (mΩ) |
| 23 |
15 |
| 29 |
16 |
| 47 |
24 |
| 64 |
32 |
| 81 |
88 |
| 87 |
118 |
| 89 |
265 |
| 93 |
319 |
| 89 |
377 |
| 96 |
525 |
| 105 |
568 |
| 125 |
611 |
| 145 |
661 |
Measurement Method: Cylindrical cavity resonator
"... the cavities used in the experiments described in this paper differ from many other cylindrical cavities in that one cavity is totally made out of superconducting YBCO and also in that measurements are made on both cavities by using a single input probe and looking at the reflected signal. For the cavity used the TE
011 mode was chosen as the lowest frequency mode of interest because this mode produces no current orthogonal to the end plates of the cylinder, and this removes the need for electrical contacts. The size of the cavity was chosen so that the TE
011 mode oscillated at =13 GHz. This gave the dimensions (diameter) = 15 mm and (length) = 34 mm. To couple electromagnetic energy to the cavity a hole was drilled in the cylindrical wall of the cavity and a small loop antenna inserted into the cavity through the hole. At exactly the same frequency of the TE
011 mode another mode, the TM
111, appears. It is important that the effects of this mode are removed by using a mode filter. In this case the mode filter consisted of a thin insulator between the end plates and the cylinder. This suppressed the TM mode substantially while not affecting the TE
011 mode."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
