A structural determination was carried out on powdered samples of Li2NbF6 and Na2NbF6, the first two compounds of a new series of hexafluoroniobates IV: M2NbF6 with M = alkali metal, NH+4. Li2NbF5 is isostructural with trigonal Li2ZrF6. Na2NbF6 is tetragonal (trirutile type) and isostructural with Na2SnF6 which was claimed to be monoclinic. The reinvestigation of the structure shows that Na2SnF6 is
对Li 2 NbF 6和Na 2 NbF 6的粉末样品进行了结构测定,这是一系列新的六
氟铌酸盐IV的前两个化合物:M 2 NbF 6,其中M =碱
金属NH + 4。Li 2 NbF 5与三角形Li 2 ZrF 6是同构的。Na 2 NbF 6是四方的(三方型),与声称是单斜晶的Na 2 SnF 6等结构。对结构的重新研究表明,Na2 SnF 6实际上是四方的,具有三重性电池。研究了Li 2 NbF 6和Na 2 NbF 6在4.2 K和室温之间的磁性。两种化合物在此温度范围内均表现出顺磁行为。参考Figgis模型讨论了实验的摩尔磁化率和有效磁矩。