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Ismunandar Ismu
Department of Chemistry, FMIPA, Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132
Engineering

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Structure Refinement of Five Layers Aurivillius Compound: Ba4Bi2Nb2Ti3O18 Ismunandar Ismu; Edi Mikrianto
Journal of Engineering and Technological Sciences Vol. 36 No. 1 (2004)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2004.36.1.4

Abstract

The room temperature structures of the five layers Aurivillius phase Ba4Bi2Nb2Ti3O18 has been refined from X-ray powder diffraction data using the Rietveld method. The structures consist of [Bi2O2]2+ layers interleaved with perovskite-like [Ba4Nb2Ti3O16]2- blocks. The oxides was found to be orthorhombic (SG B2cb); a = 5.5017(8), b = 5.5031(8), c = 50.363(3) Ã…, Rp = 25.53 Rwp = 35.54 Rexp = 29.30 RBragg = 9.92. The structural features of the compound is found similar to that of other layered Aurivillius compounds. Using the available structural data the ferroelectric properties could be explained and strategies to find good ferroelectric materials could be inferred.
Co-Authors Edi Mikrianto