Fe(1) and in trans position for Fe(2). With such a configuration, the main magnetic coupling probably occurs within the chains of octahedra via Fe-F-Fe superexchange interactions only, like in AFeF5 and A2FeF5 compounds in which the Néel temperature is close to 10 K. However, the high magnetic transition temperature of NH4FePO4F (45(1) K) shows that the influence of super-superexchange coupling is rather
迄今未知的NH 4的FePO 4 F已经被低温
水热合成分离。它是斜方晶系和偏心(空间群
PNA 2 1(第33号);一个= 12.993(3)埃,b = 6.468(1)埃,c ^ = 10.640(3)埃,V = 894.2(6)3,Z = 8)。该化合物属于KTiOPO 4(KTP)结构类型,具有严格的OF顺序,KTP中的Ti-O短键被Fe-F键取代。两个
铁站点,明确由穆斯堡尔谱,对应证实与2 F两个不同地方的情况-在顺Fe(1)的反位和Fe(2)的反位。采用这种配置,主磁耦合可能仅通过Fe-F-Fe超交换相互作用在八面体的链内发生,就像AFeF 5和Néel温度接近10 K的A 2 FeF 5化合物一样。 NH 4 FePO 4 F(45(1)K)的高磁化转变温度表明,在该化合物中,超超交换耦合的影响非常重要。