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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 6
BKCSDE 27(6)
June 20, 2006

Title	Reinvestigation of Dion-Jacobson Phases CsCa₂Nb₂MO₉ (M = Fe and Al)
Author	Young-Sik Hong
Keywords	Oxide, Layered compound, Perovskite, Dion-Jacobson phase
Abstract	Dion-Jacobson phases CsCa₂Nb₂FeO₉ and CsCa₂Nb₂AlO₉ were reinvestigated by the Rietveld analysis of powder X-ray diffraction (XRD) method, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). These nominal compounds, previously known as the oxygen-deficient layered perovskites with the sequences of NbO₆-MO₄-NbO₆ in tripled slab, in fact, were mixed phases of n = 3 Dion-Jacobson phases and impurities such as Ca₂NbFeO₆ and Ca₃Al₂O₆. The difference of morphology and chemical in-homogeneity between Dion-Jacobson phases and impurities could be clearly identified by scanning electron microscopy with energy-dispersive X-ray spectroscopy. The chemical composition of CsCa₂Nb₂FeO₉ was calculated into Cs_0.59Ca_2.64Nb_2.92Fe_0.81 in small agglomerate crystals and Cs_0.95Ca_1.97Nb_3.08Fe_0.15 in long plate-like crystals.
Page	853 - 0
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