What Are Superconducting Ceramics

Furthermore the superconducting properties t c and j c b dependencies were studied in the ybco samples and the results are shown in fig.

What are superconducting ceramics.

Tc is usually measured in degrees kelvin k 0 k being absolute zero the. Its structure consists of three cubes with yttrium or barium at the centre copper at the corners and oxygen at the middle of each edge with the exception of the middle cube which has oxygen vacancies at the outer edges. The superconductor we will be experimenting with is an yttrium y barium ba and copper cu composition. Ybco is a superconducting ceramic.

They are then called low temperature superconductors. Magnesium diboride mgb2 is known to be an important high temperature superconductor material. The temperature at which resistance ceases is referred to as the transition temperature or critical temperature tc. Conductive ceramics conductive ceramics superconductors.

Superconducting ceramics having relatively high critical temperatures are composed of rare earth metals alkaline earth metals and copper. On the other hand metallic superconductors usually work below 200 c. Superconductivity is the complete disappearance of electric resistance in materials that are cooled to extremely low temperatures. The majority of high temperature superconductors are ceramic materials.

Ceramic superconductors can be prepared using an oxalate precursor 3 4 which can be transformed to the superconducting oxide by sintering and annealing. Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. The positions of specimens marked 1a 1c 3a 3c used for the study of t c and j c b dependence in all samples are shown in fig. This transformation takes place through the carbonate which is very stable and decomposes at temperatures above 900 c.

Any material exhibiting these properties is a superconductor unlike an ordinary metallic conductor whose resistance decreases gradually as its temperature is lowered even down to near absolute zero a superconductor has a. That is it loses all resistance to electric current at extremely low temperatures. Ceramic superconductors the ceramic materials used to make superconductors are a class of materials called perovskites. They have few defects and a limited polycrystalline interfacial area.