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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 Cs0.59Ca2.64Nb2.92Fe0.81 in small agglomerate crystals and Cs0.95Ca1.97Nb3.08Fe0.15 in long plate-like crystals.
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