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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.


Polarization-electric field loop for Bi4 −xNdxTi3FeO12nanoparticles.
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Figure 9: Polarization-electric field loop for Bi4 −xNdxTi3FeO12nanoparticles.

Mentions: The ferroelectric hysteresis loop measurement is always hampered by the high leakage current. Because of low resistivity of the samples, it is difficult to apply high electric fields to the bulk samples. The ferroelectric polarization hysteresis loops at room temperature for Nd-doped Bi4 − xFeTi3O12 samples measured under an applied field (E) of about 10 kV/cm are presented in Figure 9. The loops are not really saturated and represent a partial reversal of the polarization almost elliptical-shaped [22,23]. The Pr and Ec values of the BNTF nanoparticles as a function of Nd composition are shown in Figure 10. The remanence polarization, Pr increases first and then decreases with an increasing vaue of x. The highest value of Pr = 0.110 μC/cm2 and a relatively low coercive field (Ec) of 7.918 kV/cm were observed for 5% Nd concentration. Similar behavior in Ec is also observed where it increases first and then follows a decreasing trend with increasing Nd content [24,25]. The remnant polarization of the samples is not too high. It is well known that most magnetic materials usually have high electrical conductivity. Thus, few multiferrioc materials could exhibit the ferroelectric response properly. It is very critical for magnetic materials with high insulating resistivity to posses both ferroelectric and ferromagnetic properties simultaneously. Otherwise, an applied electric field would cause an increase in current for conducting samples rather than inducing electrical polarization.


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)

Polarization-electric field loop for Bi4 −xNdxTi3FeO12nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 9: Polarization-electric field loop for Bi4 −xNdxTi3FeO12nanoparticles.
Mentions: The ferroelectric hysteresis loop measurement is always hampered by the high leakage current. Because of low resistivity of the samples, it is difficult to apply high electric fields to the bulk samples. The ferroelectric polarization hysteresis loops at room temperature for Nd-doped Bi4 − xFeTi3O12 samples measured under an applied field (E) of about 10 kV/cm are presented in Figure 9. The loops are not really saturated and represent a partial reversal of the polarization almost elliptical-shaped [22,23]. The Pr and Ec values of the BNTF nanoparticles as a function of Nd composition are shown in Figure 10. The remanence polarization, Pr increases first and then decreases with an increasing vaue of x. The highest value of Pr = 0.110 μC/cm2 and a relatively low coercive field (Ec) of 7.918 kV/cm were observed for 5% Nd concentration. Similar behavior in Ec is also observed where it increases first and then follows a decreasing trend with increasing Nd content [24,25]. The remnant polarization of the samples is not too high. It is well known that most magnetic materials usually have high electrical conductivity. Thus, few multiferrioc materials could exhibit the ferroelectric response properly. It is very critical for magnetic materials with high insulating resistivity to posses both ferroelectric and ferromagnetic properties simultaneously. Otherwise, an applied electric field would cause an increase in current for conducting samples rather than inducing electrical polarization.

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.