Justi's superconductivity experiment. Experimental equipment used in superconductivity research by the electrochemist Eduard Justi. The experiment was carried out in Berlin, Germany, in 1941. Justi worked with niobium nitride (NbN) and obtained a superconductivity temperature of 16 Kelvin (-257 degrees Celsius). This temperature was the highest superconductivity temperature attained at that time. Superconductivity is a phenomenon where the structure of a material allows unimpeded flow of electrons, usually only at low temperatures. Some forms of superconductivity can be explained by Bose-Einstein condensates, predicted by Bose and Einstein in the 1920s.