WEAK FERROMAGNETISM IN THE RHOMBOHEDRAL/ORTHORHOMBIC PHASE BOUNDARY OF Ti DOPED Bi0.86Dy0.14FeO3 CERAMICS

Abstract

The ceramic compositions of Bi_0.86Dy_0.14Fe_1-xTi_xO₃ (x = 0.02-0.1) were synthesized by solid-state reaction method to study the structural phase formation and the characteristic of weak ferromagnetism. X-ray diffractions and Rietveld analysis revealed the mixed structural phase of the R3c rhombohedral and Pnma orthorhombic structures in the entire composition range. The Pnma phase percentage was found to increase significantly at a higher dopant concentration. This tendency was further confirmed by Raman spectroscopic studies, where the phonon modes of the R3c symmetry were extinguished by an increase in Ti concentration. Scanning electron micrographs revealed two distinct grain sizes reflecting the coexistence of biphasic composition. The weak ferromagnetism was emerged, however, the Ti doping resulted in degraded magnetic properties despite the fact that Ti-substitution made a complete destruction of the cycloidal spin structure in the Pnma phase.