Structural and Multiferroic Properties of 1-x(Bi_0.85La_0.15)FeO₃–xPbTiO₃ Solid Solutions

Abstract

A series of solid solutions of 1-x(Bi_0.85La_0.15)FeO3–xPbTiO3 for x = 0.35, 0.4, 0.415, 0.43, 0.45, 0.47)(BLFPT) are prepared by the mixed oxide method. The X-ray diffraction analysis shows that BLF-PT has a single perovskite phase with mixed tetragonal and rhombohedral phases in x = 0.415. The dielectric constant and Curie temperature of BLF-PT for x = 0.415 is 836 at 10² Hz and 419 °C, respectively. The remnant polarization and magnetization of x = 0.415 reach 39 μC/cm² and 0.03 emu/g, showing a coexistence of ferroelectricity and ferromagnetism in the vicinity of the morphotropic phase boundary. The structure refinement is used to explain the correlation between structural and multiferroic properties of BLFPT solid solutions, which may be due to the existence of the monoclinic and orthorhombic phases lies on both sides of morphotropic phase boundary.

Keywords:

• Multiferroic
• Dielectric
• structural refinement

Acknowledgments

Our work was supported by the Shanghai education development foundation under grant no. 08SG41, National Nature Science Foundation of China under grant no. 50872080.