Determination of Transition Temperature of Superconductor Powder
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
The transition temperature of superconducting ceramic powders can be determined prior to sintering by measuring the movement of a magnet displaced through the Meissner effect in a magnetic balance. In Fig. 1, a sample of superconducting ceramic powder is placed in sample holder assembly 2 with thermocouple 3 attached and the holder assembly placed in cooling chamber 4. The holder assembly is insulated by paper sheets 5 at its bottom. Magnet 6 is suspended from rod 7 attached to balance beam 8 on pivot 9 and indicates displacement at (Image Omitted) scale 10. Rod 7 also carries core 11 of linear variable differential transformer 12 with output leads 13 and may carry weight 14 to compen sate for removal of a hanging pan. Magnet 6 is preferably only magnetically coupled to rod 7.