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

I. P. Raevski Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

S. A. Prosandeev Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

S. M. Emelyanov Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

V. G. Smotrakov Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

V. V. Eremkin Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

I. N. Zakharchenko Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

S. I. Raevskaya Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

E. S. Gagarina Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

F. I. Savenko Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

E. V. Sahkar Rostov State University, Stachki Ave. 194, Rostov-on-Don 344090, Russia

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Abstract

Solid solution crystals of ternary 1:1 (PbSc_1/2Ta_1/2O₃-PbSc_1/2Nb_1/2O₃) and 1:2 (PbMg_1/3Nb_2/3O₃-PbSc_1/2Nb_1/2O₃) 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.

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

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

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