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26 April 2024

» arxiv » cond-mat/0302520

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Random-Site Cation Ordering and Dielectric Properties of PbMg1/3Nb2/3o3-PbSc1/2Nb1/2o3
I. P. Raevski ; S. A. Prosandeev ; S. M. Emelyanov ; F. I. Savenko ; I. N. Zakharchenko ; O. A. Bunina ; A. S. Bogatin ; S. I. Raevskaya ; E. S. Gagarina ; E. V. Sahkar ; L. Jastrabik ;
Date:	25 Feb 2003
Subject:	Materials Science \| cond-mat.mtrl-sci
Abstract:	(1-x)PbMg1/3Nb2/3O3-(x)PbSc1/2Nb1/2O3 (PMN-PSN) solid solution crystals have been grown by the flux method in the whole concentration range. X-ray supercell reflections due to B-cation ordering were observed for as-grown crystals from the 0.1 < x < 0.65 compositional range. Though the ordered domains are rather large (~50 nm) the relaxor-like dielectric behavior is observed for compositions with x < 0.6. The diffusion of the dielectric permittivity maximum in as-grown crystals is the lowest at x = 0.6 and increases towards the end members of solid solution. Such behavior is explained within a Bragg-Williams approach by employing the random layer model. At x ~ 0.6 the excitation energy determined from the Vogel-Fulcher relation exhibits a jump which we regard to changing the kind of the polar regions from PbMg1/3Nb2/3O3 to PbSc1/2Nb1/2O3 related type.
Source:	arXiv, cond-mat/0302520
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