Transformation of Dion-Jacobson phase to Aurivillius phase: synthesis of (PbBiO{sub 2})MNb{sub 2}O{sub 7} (M = La, Bi)
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India)
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India) and Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064 (India)
We describe transformations of the Dion-Jacobson (D-J) phases, KLaNb{sub 2}O{sub 7} and RbBiNb{sub 2}O{sub 7}, to the Aurivillius (A) phases (PbBiO{sub 2})LaNb{sub 2}O{sub 7} (1) and (PbBiO{sub 2})BiNb{sub 2}O{sub 7} (2), in a metathesis reaction with PbBiO{sub 2}Cl. Oxide 1 adopts centrosymmetric tetragonal structure (a = 3.905(1) A, c = 25.66(1) A), whereas oxide 2 crystallizes in a noncentrosymmetric orthorhombic (A2{sub 1}am) (a = 5.489(1) A, b = 5.496(2) A, c = 25.53(1) A) structure. Oxide 2 shows a distinct SHG response towards 1064 nm laser radiation. The role of La{sup 3+} versus Bi{sup 3+} in the perovskite slabs for the occurrence of noncentrosymmetric structure/ferroic property in these materials is pointed out.
- OSTI ID:
- 20883089
- Journal Information:
- Materials Research Bulletin, Vol. 40, Issue 1; Other Information: DOI: 10.1016/j.materresbull.2004.09.015; PII: S0025-5408(04)00300-9; Copyright (c) 2004 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
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