Structural and magnetic properties of isovalently substituted multiferroic BiFeO3: Insights from Raman spectroscopy

Interlayer strain effects on the structural behavior of BiFeO3/LaFeO3 superlattices

“…Indeed, the phonons at 180 cm -1 being more intense than the one at 150 cm -1 (opposite is observed on the BFO film). These Raman spectra closely resemble the Raman spectra obtained near the MPB for Bi1-xLaxFeO3 solid solution (0.2≤x≤0.5) by Bielecki et al 16 . For these 15 compositions, the authors suggest the existence of a PbZrO3 antiferroelectric-like state.…”

“…It is important to mention that the STO buffer layer is fully relaxed (aMgO= 4.213 Å>> aSTO= 3.905 Å). /(LaFeO3)x superlattices 9 , in rare-earth substituted BiFeO3 2,3,12 and in the Bi1-xLaxFeO3 solid solution 15,16 . From the comparison of the FFT we can correlate antiferroelectric…”

Phase Diagram of BiFeO3/LaFeO3 Superlattices: Antiferroelectric‐Like State Stability Arising from Strain Effects and Symmetry Mismatch at Heterointerfaces

“…[33] Bielecki et al use this last phonon to track the evolution of the tilt angle versus composition and the R3c versus Pnma phase stability. [20] This last phonon mode visible in the crossed polarization geometry ( Figure 5 bands. [20,34] Strong damping and large bands also explain the impossibility to separate the different excitations and to identify the exact number of bands and phonon symmetries.…”

“…[20] The authors argue that a PbZrO 3 AFE-like state is present for the x=0.2-0.5 Bi 1-x La x FeO 3 composition. Note that the mode at 170cm -1 in bulk BFO overlap with the polar Bi ordering while the mode at 220cm -1 overlaps with the octahedral tilt degree of freedom.…”

Mn substitution-modified polar phase in the Bi1−xNdxFeO3 multiferroics

“…In contrast to the lanthanide-modified systems, the BiFe 1 x Mn x O 3 compounds keep the initial polar structure unaltered and do not exhibit weak ferromagnetic behavior in the entire concentration range of the solid solutions realization (i.e., at x 0.3 for the ambient-pressure synthesis). 21,22 Effect of combined Ln/Mn substitution (Ln ¼ La, 23 Pr, 24 Nd, 25 and Sm [26][27][28] ) on the crystal structure and magnetization behavior of the BiFeO 3 perovskite has also been recently studied; however, these investigations, being mainly focused on aspects related to doping-induced structural transformations in the (Bi, Ln)Fe 1 x Mn x O 3 series (depending on chemical composition, manganese substitution can stabilize both commensurate and incommensurate nonpolar structures [23][24][25][26][27][28] 3 . The reagents were taken in stoichiometric cation ratio, mixed and pressed into pellets.…”