If the magnet is sufficiently small and strong, the repulsion will be enough to counterbalance the pull of gravity and the magnet will levitate above the surface of the superconductor. Even though until recently the highest known critical temperature was only 23 K, observed in the intermetallic compound Nb3Ge, superconductors found a number of applications. These instruments require liquid helium as the refrigerant, which is scarce and expensive. The heating-cooling synthesis sequence is shown graphically in figure 2. Unit cell of YBa2Cu3O7.
Many chemicals are toxic.
Avoid creating or breathing dust when grinding. Avoid eye and skin contact. Wash hands thoroughly after handling. These three materials must now be thoroughly mixed to obtain good results. In a hood place the powdered materials in a mortar.