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Ferroelectric and magnetic properties of Nd-doped Bi4 - xFeTi3O12 nanoparticles prepared through the egg-white method.

Batoo KM, Labis JP, Sharma R, Singh M - Nanoscale Res Lett (2012)

Bottom Line: Room temperature polarization-electric field (P-E) curves show that the samples are not saturated with maximum remanence polarization, Pr = 0.110 μC/cm2, and a relatively low coercive field, Ec = of 7.918 kV/cm, at an applied field of 1 kV/cm was observed for 5% Nd doping.The room temperature M-H hysteresis curve shows that the samples exhibit intrinsic antiferromagnetism with a weak ferromagnetism.These properties entitle the grown nanoparticles of BNFT as one of the few multiferroic materials that exhibit decent magnetization and electric polarization.

View Article: PubMed Central - HTML - PubMed

Affiliation: King Abdullah Institute for Nanotechnology, King Saud University, P,O, Box 2460, Riyadh, 1151, Saudi Arabia. khalid.mujasam@gmail.com.

ABSTRACT
Multiferroic behavior of Bi4 - xNdxFeTi3O12 (0.0 ≤ × ≤ 0.25, × = 0.05) ceramic nanoparticles prepared through the egg-white method was investigated. The dielectric properties of the samples show normal behavior and are explained in the light of space charge polarization. Room temperature polarization-electric field (P-E) curves show that the samples are not saturated with maximum remanence polarization, Pr = 0.110 μC/cm2, and a relatively low coercive field, Ec = of 7.918 kV/cm, at an applied field of 1 kV/cm was observed for 5% Nd doping. The room temperature M-H hysteresis curve shows that the samples exhibit intrinsic antiferromagnetism with a weak ferromagnetism. These properties entitle the grown nanoparticles of BNFT as one of the few multiferroic materials that exhibit decent magnetization and electric polarization.

No MeSH data available.


FE-TEM micrograph and lattice planes. (a) FE-TEM micrograph. Lower inset, grain size distribution; upper inset, selective area electron diffraction pattern. (b) Lattice planes. Inset, lattice plane spacing for the composition x = 0.05.
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Figure 4: FE-TEM micrograph and lattice planes. (a) FE-TEM micrograph. Lower inset, grain size distribution; upper inset, selective area electron diffraction pattern. (b) Lattice planes. Inset, lattice plane spacing for the composition x = 0.05.

Mentions: The powder samples of BNTF were characterized for structural and phase analysis through X-ray diffraction shown in Figure 1. The XRD patterns for annealed samples reveal the characteristic well-crystallized pattern with a few signatures of secondary phase corresponding to pure Bi4Ti3O12 compound and alpha-Fe2O3. Figure 2 shows the EDX pattern of the pure sample confirming the chemical formation of the polycrystalline BNTF nanoparticles. Figure 3a,b shows the FE-SEM microstructure of the fracture surfaces of pristine and 5% doped Nd sample. Interestingly, with Nd doping, the densification is promoted in the grown nanoparticles. Figure 4a shows the FE-TEM micrograph with inset showing the average grain size plot and selective area electron diffraction pattern for the composition x = 0.0. The micrograph shows irregular-shaped highly agglomerated nanoparticles with an average grain size of 50 nm for the composition x = 0.05. The average crystallite sizes calculated through FE-TEM show a broad size distribution from 50 to 72 nm as shown in Figure 5. A high crystalline order is observed in the grown nanoparticles. Figure 4b shows lattice pattern for the composition x = 0.05 with inset showing the d spacing value of 0.240 Å. The d value obtained collaborated well with the value obtained from X-ray diffraction pattern.


Ferroelectric and magnetic properties of Nd-doped Bi4 - xFeTi3O12 nanoparticles prepared through the egg-white method.

Batoo KM, Labis JP, Sharma R, Singh M - Nanoscale Res Lett (2012)

FE-TEM micrograph and lattice planes. (a) FE-TEM micrograph. Lower inset, grain size distribution; upper inset, selective area electron diffraction pattern. (b) Lattice planes. Inset, lattice plane spacing for the composition x = 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475093&req=5

Figure 4: FE-TEM micrograph and lattice planes. (a) FE-TEM micrograph. Lower inset, grain size distribution; upper inset, selective area electron diffraction pattern. (b) Lattice planes. Inset, lattice plane spacing for the composition x = 0.05.
Mentions: The powder samples of BNTF were characterized for structural and phase analysis through X-ray diffraction shown in Figure 1. The XRD patterns for annealed samples reveal the characteristic well-crystallized pattern with a few signatures of secondary phase corresponding to pure Bi4Ti3O12 compound and alpha-Fe2O3. Figure 2 shows the EDX pattern of the pure sample confirming the chemical formation of the polycrystalline BNTF nanoparticles. Figure 3a,b shows the FE-SEM microstructure of the fracture surfaces of pristine and 5% doped Nd sample. Interestingly, with Nd doping, the densification is promoted in the grown nanoparticles. Figure 4a shows the FE-TEM micrograph with inset showing the average grain size plot and selective area electron diffraction pattern for the composition x = 0.0. The micrograph shows irregular-shaped highly agglomerated nanoparticles with an average grain size of 50 nm for the composition x = 0.05. The average crystallite sizes calculated through FE-TEM show a broad size distribution from 50 to 72 nm as shown in Figure 5. A high crystalline order is observed in the grown nanoparticles. Figure 4b shows lattice pattern for the composition x = 0.05 with inset showing the d spacing value of 0.240 Å. The d value obtained collaborated well with the value obtained from X-ray diffraction pattern.

Bottom Line: Room temperature polarization-electric field (P-E) curves show that the samples are not saturated with maximum remanence polarization, Pr = 0.110 μC/cm2, and a relatively low coercive field, Ec = of 7.918 kV/cm, at an applied field of 1 kV/cm was observed for 5% Nd doping.The room temperature M-H hysteresis curve shows that the samples exhibit intrinsic antiferromagnetism with a weak ferromagnetism.These properties entitle the grown nanoparticles of BNFT as one of the few multiferroic materials that exhibit decent magnetization and electric polarization.

View Article: PubMed Central - HTML - PubMed

Affiliation: King Abdullah Institute for Nanotechnology, King Saud University, P,O, Box 2460, Riyadh, 1151, Saudi Arabia. khalid.mujasam@gmail.com.

ABSTRACT
Multiferroic behavior of Bi4 - xNdxFeTi3O12 (0.0 ≤ × ≤ 0.25, × = 0.05) ceramic nanoparticles prepared through the egg-white method was investigated. The dielectric properties of the samples show normal behavior and are explained in the light of space charge polarization. Room temperature polarization-electric field (P-E) curves show that the samples are not saturated with maximum remanence polarization, Pr = 0.110 μC/cm2, and a relatively low coercive field, Ec = of 7.918 kV/cm, at an applied field of 1 kV/cm was observed for 5% Nd doping. The room temperature M-H hysteresis curve shows that the samples exhibit intrinsic antiferromagnetism with a weak ferromagnetism. These properties entitle the grown nanoparticles of BNFT as one of the few multiferroic materials that exhibit decent magnetization and electric polarization.

No MeSH data available.