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The structural, magnetic, and ferroelectric properties of polycrystalline Bi0.8-xPrxBa0.2FeO3 (0.0 ≤ x ≤ 0.1) ceramics are studied systematically. The symmetry of the unit cell with Ba and Pr substitution in BiFeO3 in the substitution range remains the cubic with the space group of Pm3m. The additive of Pr in (BiBa)FeO3 reduces the unit cell volume together with varying the lattice parameters without changing the unit cell symmetry. The distortion of FeO6 octahedron resulting from the additive of Pr may induce the collapse of the spatial spin structure, which may enhance the spontaneous magnetization significantly. The remnant magnetization (Mr) increases monotonically with increasing the content of Pr, which probably originates from the ferromagnetic arrangement of Pr-ions and Fe-ions in the unit cell. The conductivity increases in a wide temperature regime result in an obvious leakage observed with increasing the Pr concentration.
Date of Publication: Nov. 2012