Limits...
Effects of NiO nanoparticles on the magnetic properties and diffuse phase transition of BZT/NiO composites.

Jarupoom P, Eitssayeam S, Pengpat K, Tunkasiri T, Cann DP, Rujijanagul G - Nanoscale Res Lett (2012)

Bottom Line: A new composite system, Ba(Zr0.07Ti0.93)O3 (BZT93) ceramic/NiO nanoparticles, was fabricated to investigate the effect of NiO nanoparticles on the properties of these composites.M-H hysteresis loops showed an improvement in the magnetic behavior for higher NiO content samples plus modified ferroelectric properties.Examination of the dielectric spectra showed that the NiO additive promoted a diffuse phase transition, and the two phase transition temperatures, as observed for BZT93, merged into a single phase transition temperature for the composite samples.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand. rujijanagul@yahoo.com.

ABSTRACT
A new composite system, Ba(Zr0.07Ti0.93)O3 (BZT93) ceramic/NiO nanoparticles, was fabricated to investigate the effect of NiO nanoparticles on the properties of these composites. M-H hysteresis loops showed an improvement in the magnetic behavior for higher NiO content samples plus modified ferroelectric properties. However, the 1 vol.% samples showed the optimum ferroelectric and ferromagnetic properties. Examination of the dielectric spectra showed that the NiO additive promoted a diffuse phase transition, and the two phase transition temperatures, as observed for BZT93, merged into a single phase transition temperature for the composite samples.

No MeSH data available.


Magnetization (M) vs. applied magnetic field (H) of the pure BZT93 ceramic and composites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3278373&req=5

Figure 2: Magnetization (M) vs. applied magnetic field (H) of the pure BZT93 ceramic and composites.

Mentions: Figure 2 shows the M-H magnetic hysteresis loops of the samples measured at room temperature. The 1 vol.% sample exhibited a weak magnetic behavior. However, an improvement in magnetic properties was clearly observed for the composites containing NiO > 1.0 vol.%. The values of the coercive magnetic field [Hc] and remnant magnetization [Mr] of the samples are listed in Table 1. Figure 3 shows the P-E ferroelectric hysteresis loops (at room temperature) with different NiO contents. The shape of the hysteresis loop for the pure BZT93 ceramics indicates a normal ferroelectric behavior. For samples with higher NiO concentrations, however, the hysteresis loop became more slanted. Furthermore, a lossy capacitor hysteresis loop was clearly observed for the 3 vol.% sample. This may be due to the NiO additive producing a higher electrical conductivity or higher leakage characteristic in the samples. The ferroelectric properties such as remanent polarization [Pr] and coercive field [Ec] are shown in Table 1. Based on the results, the 1 vol.% samples showed the optimum properties combining between the ferroelectric and ferromagnetic properties (Mr = 0.02 emu/g, Hc = 4.51 kOe, Pr = 13.1 μC/cm2, and Ec = 9.9 kV/cm) of this composite system. These ferromagnetic and ferroelectric properties were considerably high for single-phase multiferroic materials [11,12] and other multiferroic composites [13,14].


Effects of NiO nanoparticles on the magnetic properties and diffuse phase transition of BZT/NiO composites.

Jarupoom P, Eitssayeam S, Pengpat K, Tunkasiri T, Cann DP, Rujijanagul G - Nanoscale Res Lett (2012)

Magnetization (M) vs. applied magnetic field (H) of the pure BZT93 ceramic and composites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3278373&req=5

Figure 2: Magnetization (M) vs. applied magnetic field (H) of the pure BZT93 ceramic and composites.
Mentions: Figure 2 shows the M-H magnetic hysteresis loops of the samples measured at room temperature. The 1 vol.% sample exhibited a weak magnetic behavior. However, an improvement in magnetic properties was clearly observed for the composites containing NiO > 1.0 vol.%. The values of the coercive magnetic field [Hc] and remnant magnetization [Mr] of the samples are listed in Table 1. Figure 3 shows the P-E ferroelectric hysteresis loops (at room temperature) with different NiO contents. The shape of the hysteresis loop for the pure BZT93 ceramics indicates a normal ferroelectric behavior. For samples with higher NiO concentrations, however, the hysteresis loop became more slanted. Furthermore, a lossy capacitor hysteresis loop was clearly observed for the 3 vol.% sample. This may be due to the NiO additive producing a higher electrical conductivity or higher leakage characteristic in the samples. The ferroelectric properties such as remanent polarization [Pr] and coercive field [Ec] are shown in Table 1. Based on the results, the 1 vol.% samples showed the optimum properties combining between the ferroelectric and ferromagnetic properties (Mr = 0.02 emu/g, Hc = 4.51 kOe, Pr = 13.1 μC/cm2, and Ec = 9.9 kV/cm) of this composite system. These ferromagnetic and ferroelectric properties were considerably high for single-phase multiferroic materials [11,12] and other multiferroic composites [13,14].

Bottom Line: A new composite system, Ba(Zr0.07Ti0.93)O3 (BZT93) ceramic/NiO nanoparticles, was fabricated to investigate the effect of NiO nanoparticles on the properties of these composites.M-H hysteresis loops showed an improvement in the magnetic behavior for higher NiO content samples plus modified ferroelectric properties.Examination of the dielectric spectra showed that the NiO additive promoted a diffuse phase transition, and the two phase transition temperatures, as observed for BZT93, merged into a single phase transition temperature for the composite samples.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand. rujijanagul@yahoo.com.

ABSTRACT
A new composite system, Ba(Zr0.07Ti0.93)O3 (BZT93) ceramic/NiO nanoparticles, was fabricated to investigate the effect of NiO nanoparticles on the properties of these composites. M-H hysteresis loops showed an improvement in the magnetic behavior for higher NiO content samples plus modified ferroelectric properties. However, the 1 vol.% samples showed the optimum ferroelectric and ferromagnetic properties. Examination of the dielectric spectra showed that the NiO additive promoted a diffuse phase transition, and the two phase transition temperatures, as observed for BZT93, merged into a single phase transition temperature for the composite samples.

No MeSH data available.