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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) Permittivity and (b) Dielectric 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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f7: (a) Permittivity and (b) Dielectric loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.

Mentions: Fig. 7(a) and 7(b) shows the permittivity and dielectric loss tangent of the BaFe12-xTixO19 (x = 0, 0.4, 0.6 and 0.8) ceramics as a function of frequency respectively. The permittivity of the ceramics increases significantly at low frequency range with doping Ti4+. Unlike the permittivity of barium ferrite without doping which is almost independent of frequency, the permittivity of the Ti4+ ions doped barium ferrites decreases rapidly with increasing frequency and the decreasing speed becomes slow as the content of Ti4+ is high from x = 0.4 ~ 0.6 to x = 0.8. A steplike shoulder appears typically in permittivity at moderate frequency with Ti content of x ≥ 0.6. Colossal permittivity which is about 100 k below 100 KHz and 20 k above 1 MHz appears in BaFe11.2Ti0.8O19 ceramic. The dielectric loss tangent of BaFe12-xTixO19 ceramics decreases dramatically initially and then keeps stable with increasing frequency and it reduces accordingly with rising Ti4+ ions in the ferrites.


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) Permittivity and (b) Dielectric 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

f7: (a) Permittivity and (b) Dielectric loss tangent of BaFe12-xTixO19 ceramics (x = 0, 0.4, 0.6 and 0.8) sintered at 1200°C for 3 h.
Mentions: Fig. 7(a) and 7(b) shows the permittivity and dielectric loss tangent of the BaFe12-xTixO19 (x = 0, 0.4, 0.6 and 0.8) ceramics as a function of frequency respectively. The permittivity of the ceramics increases significantly at low frequency range with doping Ti4+. Unlike the permittivity of barium ferrite without doping which is almost independent of frequency, the permittivity of the Ti4+ ions doped barium ferrites decreases rapidly with increasing frequency and the decreasing speed becomes slow as the content of Ti4+ is high from x = 0.4 ~ 0.6 to x = 0.8. A steplike shoulder appears typically in permittivity at moderate frequency with Ti content of x ≥ 0.6. Colossal permittivity which is about 100 k below 100 KHz and 20 k above 1 MHz appears in BaFe11.2Ti0.8O19 ceramic. The dielectric loss tangent of BaFe12-xTixO19 ceramics decreases dramatically initially and then keeps stable with increasing frequency and it reduces accordingly with rising Ti4+ ions in the ferrites.

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.