Three-layer Aurivillius phases containing magnetic transition metal cations: Bi{sub 2-} {sub x} Sr{sub 2+} {sub x} (Nb,Ta){sub 2+} {sub x}M {sub 1-} {sub x} O{sub 12}, M=Ru{sup 4+}, Ir{sup 4+}, Mn{sup 4+}, x{approx}0.5

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.10.031· OSTI ID:21015659

Sharma, Neeraj ^[1]; Wrighter, Grant E ^[1]; Chen, Parry Y ^[1]; Kennedy, Brendan J ^[1]; Lee, Peter L ^[2]

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1. School of Chemistry, University of Sydney, Sydney, NSW 2006 (Australia)
2. X-ray Operations and Research Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)

We report the synthesis of Aurivillius-type phases incorporating magnetic M {sup 4+} cations (M=Mn, Ru, Ir), based on the substitution of M {sup 4+} for Ti{sup 4+} in Bi{sub 2}Sr{sub 2}(Nb,Ta){sub 2}TiO{sub 12}. Key to incorporating these magnetic transition metal cations appears to be the partial substitution of Sr{sup 2+} for Bi{sup 3+} in the {alpha}-PbO-type layer of the Aurivillius phase, leading to a concomitant decrease in the M {sup 4+} content; i.e., the composition of the prepared compounds was Bi{sub 2-} {sub x} Sr{sub 2+} {sub x} (Nb,Ta){sub 2+} {sub x}M {sub 1-} {sub x} O{sub 12}, x{approx}0.5. These compounds only exist over a narrow range of x, between an apparent minimum (x{approx}0.4) Sr{sup 2+} content in the {alpha}-PbO-type [Bi{sub 2}O{sub 2}] layer required for Aurivillius phases to form with magnetic M {sup 4+} cations, and an apparent maximum (x{approx}0.6) Sr{sup 2+} substitution in this [Bi{sub 2}O{sub 2}] layer. Rietveld-refinement of synchrotron X-ray powder diffraction data making use of anomalous dispersion at the Nb and Ru K edges show that the overwhelming majority of the incorporated M cations occupy the central of the three MO{sub 6} octahedral layers in the perovskite-type block. Magnetic susceptibility measurements are presented and discussed in the context of the potential for multiferroic (magnetoelectric) properties in these materials. - Graphical abstract: Structure of Bi{sub 1.5}Sr{sub 2.5}Nb{sub 2.5}Ru{sub 0.5}O{sub 12}.

• OSTI ID: 21015659
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BISMUTH COMPOUNDS
BISMUTH IONS
CATIONS
IRIDIUM COMPOUNDS
IRIDIUM IONS
LAYERS
MAGNETIC SUSCEPTIBILITY
MANGANESE COMPOUNDS
MANGANESE IONS
NIOBIUM COMPOUNDS
OXIDES
PEROVSKITE
RUTHENIUM COMPOUNDS
RUTHENIUM IONS
STRONTIUM COMPOUNDS
STRONTIUM IONS
SYNCHROTRON RADIATION
SYNTHESIS
TANTALUM COMPOUNDS
TITANIUM IONS
X-RAY DIFFRACTION