Sivakumar, T. ; Gopalakrishnan, J. (2005) Transformation of Dion-Jacobson phase to aurivillius phase: synthesis of (PbBiO2)MNb2O7 (M = La, Bi) Materials Research Bulletin, 40 (1). pp. 39-45. ISSN 0025-5408
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00255...
Related URL: http://dx.doi.org/10.1016/j.materresbull.2004.09.015
Abstract
We describe transformations of the Dion-Jacobson (D-J) phases, KLaNb2O7 and RbBiNb2O7, to the Aurivillius (A) phases, (PbBiO2)LaNb2O7 (1) and (PbBiO2)BiNb2O7 (2), in a metathesis reaction with PbBiO2Cl. Oxide 1 adopts centrosymmetric tetragonal structure (a = 3.905(1) Å, c = 25.66(1) Å), whereas oxide 2 crystallizes in a noncentrosymmetric orthorhombic (A21am) (a = 5.489(1) Å, b = 5.496(2) Å, c = 25.53(1) Å) structure. Oxide 2 shows a distinct SHG response towards 1064 nm laser radiation. The role of La3+ versus Bi3+ in the perovskite slabs for the occurrence of noncentrosymmetric structure/ferroic property in these materials is pointed out.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | A. Oxides; A. Layered Compounds; B. Chemical Synthesis; C. X-ray Diffraction |
| ID Code: | 12327 |
| Deposited On: | 10 Nov 2010 05:40 |
| Last Modified: | 02 Jun 2011 10:37 |
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