Preparation of New High-Tc Superconducting Multinary Oxynitrides by Ammonolysis through Citrate Route

岩盐型结构的氮化铌被认为是Tc=17K的超导体。在氮化铌氧化物或氨解氮化物中均质混合的无定形氧化物或三元氧化物均可获得新的超导体如下：(1)岩盐类型(Nb_ < 0.95 > Mg_ < 0.05 >) (N_ < 0.92 > O_ < 0.08 >), (Nb_ < 0.89 > Al_ < 0.11 >) (N_ < 0.84 > O_ < 0.16 >), (Nb_ < 0.87 > Si_ < 0.09 >□_ < 0.04 >)(N_ < 0.87 > O_ < 0.13 >), (2) LiTa_3N_4类型(Li_ < 0.88 >□_ < 0.12 >)Nb_3 (N_ < 0.87 > O_ < 0.13 >) _4,(3)岩石板状晶体盐类型(Nb_ < 0.5 > Ti_ < 0.5 >) N

Niobium nitride in rock salt type structure had been known as a superconductor with Tc=17K. New superconductors were obtained in niobium oxynitrides or nitride in ammonolyses either of homogeneously mixed amorphous oxides or ternary oxide as follows ; (1)rock salt type (Nb_<0.95>Mg_<0.05>)(N_<0.92>O_<0.08>), (Nb_<0.89>Al_<0.11>)(N_<0.84>O_<0.16>),(Nb_<0.87>Si_<0.09>□_<0.04>)(N_<0.87>O_<0.13>),(2)LiTa_3N_4 type (Li_<0.88>□_<0.12>)Nb_3(N_<0.87>O_<0.13>)_4,(3)platy crystals of rock salt type (Nb_<0.5>Ti_<0.5>)N