Comparative Study of Cation Ordering Effects in Single Crystals of 1:1 and 1:2 Complex Perovskites Solid Solutions

Solid solution crystals of ternary 1:1 (PbSc 1/2 Ta 1/2 O 3 -PbSc 1/2 Nb 1/2 O 3 ) and 1:2 (PbMg 1/3 Nb 2/3 O 3 -PbSc 1/2 Nb 1/2 O 3 ) perovskites were grown from the flux. X-ray supercell reflections due to B-cation ordering were observed for as-grown crystals. The same regularities of cation order...

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Bibliographic Details
Published in:Ferroelectrics 2004-01, Vol.298 (1), p.267-274
Main Authors: Raevski, I. P., Prosandeev, S. A., Emelyanov, S. M., Smotrakov, V. G., Eremkin, V. V., Zakharchenko, I. N., Raevskaya, S. I., Gagarina, E. S., Savenko, F. I., Sahkar, E. V.
Format: Article
Language:English
Subjects:
Cation ordering
ferroelectrics
perovskites
phase transitions
relaxors
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Summary:Solid solution crystals of ternary 1:1 (PbSc 1/2 Ta 1/2 O 3 -PbSc 1/2 Nb 1/2 O 3 ) and 1:2 (PbMg 1/3 Nb 2/3 O 3 -PbSc 1/2 Nb 1/2 O 3 ) perovskites were grown from the flux. X-ray supercell reflections due to B-cation ordering were observed for as-grown crystals. The same regularities of cation ordering during the crystal growth were found to be valid for both systems: the disordered structure is formed first even when the crystallization temperature is much lower than the temperature T t of the compositional order-disorder phase transition and the disordered state is non-equilibrium. The ordering then starts via a diffusion-type mechanism, its rate depending greatly on the relation of crystallization temperature and T t .
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190490423660