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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.


Relative permittivity and loss tangent as a function of temperature. (a) Pure BZT93 ceramic, (b) BZT93 + 1.0 vol.% NiO, (c) BZT93 + 2.0 vol.% NiO, and (d) BZT93 + 3.0 vol.% NiO.
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Figure 4: Relative permittivity and loss tangent as a function of temperature. (a) Pure BZT93 ceramic, (b) BZT93 + 1.0 vol.% NiO, (c) BZT93 + 2.0 vol.% NiO, and (d) BZT93 + 3.0 vol.% NiO.

Mentions: Figure 4 shows plots of the relative permittivity and loss tangent as a function of temperature at various NiO concentrations. Two phase transition peaks in the permittivity curve were observed for the pure BZT93. The relative permittivity and loss tangent curves for the pure BZT93 ceramic are similar to those reported in a previous work [8,15]. Furthermore, all samples showed a weak frequency dispersion of the relative permittivity. However, an obvious change in the relative permittivity curve was observed when NiO was added to the samples. The transition temperature [Tm] at maximum relative permittivity [εr, max] decreased from 105°C for the pure BZT93 ceramics to 60°C for the 1.0 vol.% sample, then gradually decreased to 57°C for the 3.0 vol.% sample. Moreover, the maximum relative permittivity decreased from 12,000 for the pure BZT93 ceramics to 3,200 for the 3.0 vol.% samples. In addition, the two phase transition temperatures merged into a single diffuse phase transition at higher NiO contents (Figure 4d). To check the effect of NiO on the degree of the diffuse phase transition, diffuseness parameter [δγ] was determined using the following expression:


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)

Relative permittivity and loss tangent as a function of temperature. (a) Pure BZT93 ceramic, (b) BZT93 + 1.0 vol.% NiO, (c) BZT93 + 2.0 vol.% NiO, and (d) BZT93 + 3.0 vol.% NiO.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Relative permittivity and loss tangent as a function of temperature. (a) Pure BZT93 ceramic, (b) BZT93 + 1.0 vol.% NiO, (c) BZT93 + 2.0 vol.% NiO, and (d) BZT93 + 3.0 vol.% NiO.
Mentions: Figure 4 shows plots of the relative permittivity and loss tangent as a function of temperature at various NiO concentrations. Two phase transition peaks in the permittivity curve were observed for the pure BZT93. The relative permittivity and loss tangent curves for the pure BZT93 ceramic are similar to those reported in a previous work [8,15]. Furthermore, all samples showed a weak frequency dispersion of the relative permittivity. However, an obvious change in the relative permittivity curve was observed when NiO was added to the samples. The transition temperature [Tm] at maximum relative permittivity [εr, max] decreased from 105°C for the pure BZT93 ceramics to 60°C for the 1.0 vol.% sample, then gradually decreased to 57°C for the 3.0 vol.% sample. Moreover, the maximum relative permittivity decreased from 12,000 for the pure BZT93 ceramics to 3,200 for the 3.0 vol.% samples. In addition, the two phase transition temperatures merged into a single diffuse phase transition at higher NiO contents (Figure 4d). To check the effect of NiO on the degree of the diffuse phase transition, diffuseness parameter [δγ] was determined using the following expression:

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.