Bi 1Àx La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 solid solution obtained by mechanochemical synthesis was characterized by X-ray diffraction (XRD), atomic force microscopy and Fourier transform near-infrared Raman spectroscopy. The single-phase solid solution with La content between x D 0 and 0.5 was prepared. The solid solution exhibits a tetragonal symmetry P4mm for 0 x 0.2. It was found that Raman spectra undergo a significant change for the solid solution with La content between x D 0.16 and 0.20. It may indicate the existence of a morphotropic boundary in this range of the La content. Detailed XRD study on (Bi 0.5 La 0.5 FeO 3 ) 0.5 (PbTiO 3 ) 0.5 pointed to a rhombohedral symmetry R3c.
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