| Autor: |
Raevski, I.P., Prosandeev, S.A., Emeleyanov, S.M., Smotrakov, V.G., Eremkin, V.V., Zakharchenko, I.N., Raevskaya, S.I., Gagarina, E.S., Savenko, F.I., Sahkar, E.V. |
| Předmět: |
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| Zdroj: |
Ferroelectrics; 2004, Vol. 298 Issue 1, p267-274, 8p |
| Abstrakt: |
Solid solution crystals of ternary 1:1 (PbSc½Ta½O3-PbSc½Nb½O3) and 1:2 (PbMg⅓Nb2/3O3-PbSc½Nb½O3) 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 Tt 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 Tt. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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