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Transformation of Dion-Jacobson phase to Aurivillius phase: synthesis of $(PbBiO_2)MNb_2O_7$ (M = La, Bi)

Sivakumar, T and Gopalakrishnan, J (2005) Transformation of Dion-Jacobson phase to Aurivillius phase: synthesis of $(PbBiO_2)MNb_2O_7$ (M = La, Bi). In: Materials Research Bulletin, 40 (1). pp. 39-45.

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Abstract

We describe transformations of the Dion–Jacobson (D–J) phases, $KLaNb_2O_7$ and $RbBiNb_2O_7$, to the Aurivillius (A) phases, $(PbBiO_2)LaNb_2O_7$ (1) and $(PbBiO_2)BiNb_2O_7$ (2), in a metathesis reaction with $PbBiO_2Cl$. Oxide 1 adopts centrosymmetric tetragonal structure $(a = 3.905(1) \AA , c = 25.66(1) \AA )$, whereas oxide 2 crystallizes in a noncentrosymmetric orthorhombic $(A2_1am)$ $(a = 5.489(1) \AA , b = 5.496(2) \AA , c = 25.53(1) \AA )$ structure. Oxide 2 shows a distinct SHG response towards 1064 nm laser radiation. The role of $La^{3+}$ versus $Bi^{3+}$ in the perovskite slabs for the occurrence of noncentrosymmetric structure/ferroic property in these materials is pointed out.

Item Type: Journal Article
Additional Information: The Copyright belongs to Elsevier.
Keywords: A. Oxides;A. Layered compounds;B. Chemical synthesis;C. X-ray diffraction
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 28 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ernet.in/id/eprint/5849

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