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Multi-susceptibile single-phased ceramics with both considerable magnetic and dielectric properties by selectively doping.

Liu C, Zhang Y, Jia J, Sui Q, Ma N, Du P - Sci Rep (2015)

Bottom Line: In terms of charge balance, Fe(3+)/Fe(2+) pair dipoles are produced through the substitution of Fe(3+) by high-valenced ions.The electron hopping between Fe(3+) and Fe(2+) ions results in colossal permittivity.This study provides a convenient method to attain practicable materials with both outstanding magnetic and dielectric properties, which may be of interest to integration and multi-functionality of electronic devices.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China.

ABSTRACT
Multiferroic ceramics with extraordinary susceptibilities coexisting are vitally important for the multi-functionality and integration of electronic devices. However, multiferroic composites, as the most potential candidates, will introduce inevitable interface deficiencies and thus dielectric loss from dissimilar phases. In this study, single-phased ferrite ceramics with considerable magnetic and dielectric performances appearing simultaneously were fabricated by doping target ions in higher valence than that of Fe(3+), such as Ti(4+), Nb(5+) and Zr(4+), into BaFe12O19. In terms of charge balance, Fe(3+)/Fe(2+) pair dipoles are produced through the substitution of Fe(3+) by high-valenced ions. The electron hopping between Fe(3+) and Fe(2+) ions results in colossal permittivity. Whilst the single-phased ceramics doped by target ions exhibit low dielectric loss naturally due to the diminishment of interfacial polarization and still maintain typical magnetic properties. This study provides a convenient method to attain practicable materials with both outstanding magnetic and dielectric properties, which may be of interest to integration and multi-functionality of electronic devices.

No MeSH data available.


(a) Permeability and (b) Magnetic loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.
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f6: (a) Permeability and (b) Magnetic loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.

Mentions: Fig. 6(a) and 6(b) shows the permeability and magnetic loss tangent of the BaFe12-xTixO19 (x = 0, 0.4, 0.6 and 0.8) ceramics as a function of frequency respectively. It is seen that permeability of all the samples is almost independent of frequency, except for a little bit decrease in BaFe11.2Ti0.8O19 above 70 MHz. Meanwhile, the frequency independent permeability increases rapidly from about 1.5 to 5.1 with x varying from 0 to 0.8. The magnetic loss tangent of the ferrites depends on frequency and Ti4+ content. It decreases from ~0.35 to ~0.07 at low frequency of 1 MHz and increases from ~0.1 to ~0.4 around 100 MHz respectively with increasing content of Ti4+ ions from x = 0 to x = 0.8. While it is as low as ~0.1 at moderate frequency.


Multi-susceptibile single-phased ceramics with both considerable magnetic and dielectric properties by selectively doping.

Liu C, Zhang Y, Jia J, Sui Q, Ma N, Du P - Sci Rep (2015)

(a) Permeability and (b) Magnetic loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4383142&req=5

f6: (a) Permeability and (b) Magnetic loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.
Mentions: Fig. 6(a) and 6(b) shows the permeability and magnetic loss tangent of the BaFe12-xTixO19 (x = 0, 0.4, 0.6 and 0.8) ceramics as a function of frequency respectively. It is seen that permeability of all the samples is almost independent of frequency, except for a little bit decrease in BaFe11.2Ti0.8O19 above 70 MHz. Meanwhile, the frequency independent permeability increases rapidly from about 1.5 to 5.1 with x varying from 0 to 0.8. The magnetic loss tangent of the ferrites depends on frequency and Ti4+ content. It decreases from ~0.35 to ~0.07 at low frequency of 1 MHz and increases from ~0.1 to ~0.4 around 100 MHz respectively with increasing content of Ti4+ ions from x = 0 to x = 0.8. While it is as low as ~0.1 at moderate frequency.

Bottom Line: In terms of charge balance, Fe(3+)/Fe(2+) pair dipoles are produced through the substitution of Fe(3+) by high-valenced ions.The electron hopping between Fe(3+) and Fe(2+) ions results in colossal permittivity.This study provides a convenient method to attain practicable materials with both outstanding magnetic and dielectric properties, which may be of interest to integration and multi-functionality of electronic devices.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China.

ABSTRACT
Multiferroic ceramics with extraordinary susceptibilities coexisting are vitally important for the multi-functionality and integration of electronic devices. However, multiferroic composites, as the most potential candidates, will introduce inevitable interface deficiencies and thus dielectric loss from dissimilar phases. In this study, single-phased ferrite ceramics with considerable magnetic and dielectric performances appearing simultaneously were fabricated by doping target ions in higher valence than that of Fe(3+), such as Ti(4+), Nb(5+) and Zr(4+), into BaFe12O19. In terms of charge balance, Fe(3+)/Fe(2+) pair dipoles are produced through the substitution of Fe(3+) by high-valenced ions. The electron hopping between Fe(3+) and Fe(2+) ions results in colossal permittivity. Whilst the single-phased ceramics doped by target ions exhibit low dielectric loss naturally due to the diminishment of interfacial polarization and still maintain typical magnetic properties. This study provides a convenient method to attain practicable materials with both outstanding magnetic and dielectric properties, which may be of interest to integration and multi-functionality of electronic devices.

No MeSH data available.