Abstract
The solid solution of (1-x)BiFeO 3-xDyFeO 3 was prepared by solid state reactions in the form of ceramics. The effects of chemical modification by means of aliovalent ionic substitution of Ti 4+ for Fe 3+ on the structure and dielectric properties were investigated. A morphotropic phase boundary bridging the perovskite rhombohedral phase and the orthoferrite orthorhombic phase was identified at x around 0.1. The chemical modification was found to stabilize the perovsite phase. The dielectric performance of the solid solution was improved by the substitution of Ti 4+ for Fe 3+, which decreased the electric conductivity by reducing oxygen vacancies, as evidenced by the decrease in loss tangent values. Magnetic hysteresis and large saturated magnetization (0.5 μB/f.u.) were realized in 0.92BiFeO 3-0.08DyFeO 3 with 2% substitution of Ti 4+ for Fe 3+, which is believed to arise from the disruption of the spiral spin modulation after structural modification, and the interaction between the spins of the Dy 3+ and Fe 3+ at low temperatures which decouples the antiferromagnetic order between the Fe 3+ ions.
| Original language | English |
|---|---|
| Pages (from-to) | 377-381 |
| Number of pages | 5 |
| Journal | European Physical Journal B |
| Volume | 71 |
| Issue number | 3 |
| DOIs | |
| State | Published - Oct 2009 |