Superconductivity of Layered Perovskite Synthesized by Soft Chemistry
Reduced niobates, MLixCa2Nb3O10 (M = Rb, K and Na) and KNaxCa2Nb3O10 were synthesized by intercalation reaction with n-butyllithium or sodium azide. Ruddlesden-Popper type structure of sodium intercalation compound, KNaCa2Nb3O10, differ from that of the parent compound and lithium intercalation compound, KLiCa2Nb3O10. The magnetic susceptibility measurements showed that the sodium intercalation compound became superconductor with transition temperatures below 3.5 K. New lithium intercalation compound Na0.1Li0.8Ca2.45Nb3O10, for an ion exchange compound, Na0.1Ca2.45Nb3O10, with KCa2Nb3O10 type structure show the diamagnetic signals below 5 K.
K. Katayama, K. Kato, T. Takenaka, M. Takata and K. Shinozaki
T. Teranishi et al., "Superconductivity of Layered Perovskite Synthesized by Soft Chemistry", Key Engineering Materials, Vol. 350, pp. 163-166, 2007