New substitutions and novel derivatives of the Aurivillius phases, Bi{sub 5}TiNbWO{sub 15} and Bi{sub 4}Ti{sub 3}O{sub 12}

Journal Article · Thu May 03 00:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.08.009· OSTI ID:21000641

Tripathy, Mamata ^[1]; Mani, Rohini ^[1]; Gopalakrishnan, J ^[1]

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1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India)

We investigated isomorphous substitution of several metal atoms in the Aurivillius structures, Bi{sub 5}TiNbWO{sub 15} and Bi{sub 4}Ti{sub 3}O{sub 12}, in an effort to understand structure-property correlations. Our investigations have led to the synthesis of new derivatives, Bi{sub 4}LnTiMWO{sub 15} (Ln = La, Pr; M = Nb, Ta), as well as Bi{sub 4}PbNb{sub 2}WO{sub 15} and Bi{sub 3}LaPbNb{sub 2}WO{sub 15}, that largely retain the Aurivillius (n = 1) + (n = 2) intergrowth structure of the parent oxide Bi{sub 5}TiNbWO{sub 15}, but characteristically tend toward a centrosymmetric/tetragonal structure for the Ln-substituted derivatives. On the other hand, coupled substitution, 2Ti{sup IV} {sup {yields}} M{sup V} + Fe{sup III} in Bi{sub 4}Ti{sub 3}O{sub 12}, yields new Aurivillius phases, Bi{sub 4}Ti{sub 3-2x}Nb {sub x}Fe {sub x}O{sub 12} (x = 0.25, 0.50) and Bi{sub 4}Ti{sub 3-2x}Ta {sub x}Fe {sub x}O{sub 12} (x = 0.25) that retain the orthorhombic noncentrosymmetric structure of the parent Bi{sub 4}Ti{sub 3}O{sub 12}. Two new members of this family, Bi{sub 2}Sr{sub 2}Nb{sub 2}RuO{sub 12} and Bi{sub 2}SrNaNb{sub 2}RuO{sub 12} that are analogous to Bi{sub 2}Sr{sub 2}Nb{sub 2}TiO{sub 12}, possessing tetragonal (I4/mmm) Aurivillius structure have also been synthesized.

• OSTI ID: 21000641
• Journal Information: Materials Research Bulletin, Vol. 42, Issue 5; Other Information: DOI: 10.1016/j.materresbull.2006.08.009; PII: S0025-5408(06)00329-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL PREPARATION
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OPTICAL PROPERTIES
ORTHORHOMBIC LATTICES
OXIDES
TETRAGONAL LATTICES
X-RAY DIFFRACTION