The trend towards miniaturization of the devices resulted in a renaissance in the studies of materials exhibiting simultaneously ferroelectric and ferromagnetic properties. Among them BiFeO₃remains still interestingas a single-phase multiferroic at room temperature (T_C=1100 K [1], T_N=420 K [2]). Bismuth ferrite is known to form solid solutions with ferroelectric perovskites [3, 4] in which one can expect an enhancement of the magneto-electric coupling due to the increase in the long-range electric order. The properties of (BiFeO₃)_1-x(BaTiO₃)_xsolution obtained by solid state reaction were studied by Kumar et al. [5] and Buscaglia et al. [6]. We used much simpler procedure to obtain of (BiFeO₃)_0.7(BaTiO₃)_0.3solid solution: a direct synthesis from respective oxides at room temperature via mechanically triggered chemical reaction.

High purity Aldrich bismuth oxides in stoichiometric ratios (Bi₂O₃+ Fe₂O₃)_0.7(BaO + TiO₂)_0.3were mechanically activated in SPEX 8000 Mixer Mill in the air atmosphere at room temperature during various milling time t_m. The batch contained 6 g of the oxides and the weight ratio of the stainless steel balls to the oxides was 2:1.

The mechanical synthesis of the powder after different times t_mwas controlled by X-ray diffraction using a Stoe Diffraction System with Cu-K_1radiation. Linear position sensitive detector was used to measure the diffracted radiation in the 2angle from 3 to 103 degrees of arc and standard DHN-PDS reduction procedure was applied to analyze the powder diffraction pattern. The mean grain size of the powder was assessed with Scherrer method from the half-width of the (h1 k1 l1) and (h2 k2 l2) profiles with Williamson-Hall analysis. We assumed a monodispersive grain size distribution an the Lorentzian profile of the reflections.

The powder after 75 h of mechanical synthesis was found to be a single-phase (BiFeO₃)_0.7(BaTiO₃)_0.3with rhombohedral symmetry and lattice parameters: a = 0.5608(5) nm, c = 1.3853(3) nm. The assessed mean grain size of the powder amounts to ~12 nm and the grains exhibit a core-shell type structure.

[1] J.R.Teague, R. Gerson, W.J. James, Solid State Commun. 8, 1073 (1992)

[2] I. Sosnowska, M. Lowenhaupt, W.I.F. David, M.R. Ibberson, Physica B 180, 117 (1992)

[3] R.T. Smith.G.D. Achenbach, R. Gerson, W.J. James, J. Appl. Phys. 39, 70 (1968)

[4] T. Fuji, S. Jinzenji, Y. Y. Asahara, T. Shinjo, J. Appl. Phys. 64, 5434(1988).

[5] M. Kumar, A. Srinivas, S.V. Suryanarayana, J. Appl. Phys. 87, 855 (2000).

[6] MT. Buscaglia, L. Mitoseriu, V. Buscaglia, B. Pallecchi, M. Viviani, P. Nanni, A.S. Siri, J. Europ. Ceram. Soc. 26, 3027 (2006).

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1. CHARACTERIZATION OF ARIPIPRAZOLE SOLVATE WITH ETHANOL AND POLYMORPHIC FORMS PRODUCED DURING ITS HEATING