M(Pr,Ag)替代的La212型化合物的相变和晶体结构(英文)

Phase Relation and Crystal Structure of M-substituted La212 Type Compounds(M =Pr,Ag)

用固态反应法制备了M (Pr,Ag)替代的La2 12型化合物 ,发现La2 -xSrxCa0 .5Pr0 .5Cu2 O6,La1.6Pr0 .4Ca1-xPrxCu2 O6和La2 -xPrxCa0 .5Sr0 .5Cu2 O6单相范围的x值分别是 0 .4～ 1.1,0～ 0 .5和 0～ 1.5 .一些新的La2 12型化合物La2 -xAgxCaCu2 O6和La2 Ca1-xAgxCu2 O6也被制备出来了 ,它们的结构经鉴定属于具有I4/mmm空间群的La2

TheM substitutedLa2 12typecompounds (M =Pr ,Ag)arepreparedbysolidstate reactionmethod .Itisfoundthatx valuesofsinglephaseboundariesofLa2 -xSrxCa0 .5Pr0 .5 Cu2 O6,La1.6Pr0 .4 Ca1-xPrxCu2 O6andLa2 -xPrxCa0 .5Sr0 .5Cu2 O6are 0 .4～ 1.1,0～ 0 .5and 0～ 1.5respectively .NewmembersofLa2 12typecompounds ,La2 -xAgxCaCu2 O6andLa2 Ca1-x AgxCu2 O6arealsoprepared .TheirstructuresareverifiedtobelongtothestructuretypeofLa2 12 cuprateoxidesuperconductorswithspacegroupI4/mmmbyRietveldstructurerefinement .