Mandala, Tapas Kumar ; Augustine, Saji ; Gopalakrishnan, J. ; Boullay, Ph. (2005) Bi4LnNb3O15 (Ln = La, Pr, Nd) and Bi4LaTa3O15: new intergrowth Aurivillius related phases Materials Research Bulletin, 40 (6). pp. 920-927. ISSN 0025-5408
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.materresbull.2005.03.005
Abstract
We describe the synthesis and characterization of new intergrowth Aurivillius related phases, Bi4LnNb3O15 (Ln = La, Pr, Nd) and Bi4LaTa3O15. Both powder X-ray diffraction and electron microscopy investigations show that the compounds adopt orthorhombic structures with the cell parameters a ~ 5.5 Å, b ~ 5.5 Å and c ~ 20.9 Å, suggesting an ordered intergrowth structure that consists of n = 1 [Bi2NbO6]- and n = 2 Bi2LnNb2O9]+ Aurivillius fragments which are stacked alternately along the c-axis. The oxides do not show a second harmonic generation (SHG) response toward 1064 nm laser radiation; they do not show a ferroelectric-paraelectric transition either between 30 and 900 ° C in dielectric measurements, indicating a centrosymmetric structure. Optical absorption studies show that the intergrowth phases possess considerably smaller band gaps than the parent Nb2O5 and Ta2O5.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | A. Oxides; A. Layered Compounds; C. X-ray Diffraction; C. Electron Diffraction; C. Electron Microscopy; D. Optical Properties |
| ID Code: | 84288 |
| Deposited On: | 24 Feb 2012 15:35 |
| Last Modified: | 24 Feb 2012 15:35 |
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