Dielectric Properties of BaTiO<sub>3</sub>-Modified BiFeO<sub>3</sub>Ceramics

Chandarak, S.; Ngamjarurojana, Athipong; Srilomsak, Sutham; Laoratanakul, Pitak; Rujirawat, Saroj; Yimnirun, Rattikorn

doi:10.1080/00150193.2010.492724

Cited by 27 publications

(6 citation statements)

References 18 publications

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“…Actually, this relaxation behavior can also be found in other BaTiO 3 -BiMeO 3 systems. [20][21][22][23][24][25][26]29,33,36,38,40,[46][47][48] The emergence of the relaxor behaviour in this study may be explained by the increased cation disorder due to the Ti-site and Ba-site substitutions by Yb 3+ and Bi 3+ . Due to the size and charge difference, the substitutions disrupt the long-range dipolar interaction and form the local distortion of the polar region.…”

Section: Resultsmentioning

confidence: 62%

BaTiO₃–BiYbO₃perovskite materials for energy storage applications

et al. 2015

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Novel perovskite-type of (1-x)BaTiO 3 -xBiYbO 3 solid solutions with x = 0.00 ~ 0.20 were synthesized by conventional solid-state reaction methods. A systematic structural change from the ferroelectric tetragonal to pseudo-cubic phase was observed at about x = 0.050 ~ 0.051 at room temperature. Dielectric measurements revealed a gradual change from normal ferroelectric behavior to highly diffusive and dispersive relaxor-like characteristics, where the phase transition temperature shifted to higher temperature with increasing frequency. With the increase of BiYbO 3 content, the nonlinearity of the (1-x)BaTiO 3 -xBiYbO 3 ceramic was weakened obviously. The bulk ceramics were characterized by high polarization maxima and low remnant polarization, exhibiting slim P-E hysteresis loops. The results demonstrated that the (1-x)BaTiO 3 -xBiYbO 3 ceramics were promising lead-free relaxor materials for energy storage application.Recently, lead-free relaxor ferroelectrics have received dramatic attention because of toxicity of lead. Researchers find that Bi 3+ ion is a promising alternative to Pb 2+ ion due to their similar lone pair electronic 6s 2 configuration. 17 The Bi 2 O 3 -doped BaTiO 3 materials are characterized to exhibit both ferroelectric and relaxor properties depending on the composition.

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Section: Resultsmentioning

confidence: 62%

BaTiO₃–BiYbO₃perovskite materials for energy storage applications

et al. 2015

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“…valence state. This dominant factor clearly controls the observed dielectric characteristics of the sample, rather than the highly insulating behaviour of the BT constituent [25].…”

Section: Frequency Dependence Of the Dielectric Constant Of 95bfo-5btmentioning

confidence: 91%

Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

Raut

Salame

Kolte

et al. 2015

J Mater Sci: Mater Electron

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A detailed study of electrical behavior of 95BiFeO 3 -5BaTiO 3 (95BFO-5BT) ceramics through comprehensive analysis of temperature and frequency dependent dielectric behavior, ac impedance and magnetodielectric (MD) properties is reported here. Addition of insulating BaTiO 3 into BiFeO 3 have exhibited enhanced dielectric and ferromagnetic responses. The remnant polarization (P r ) was found to be 6 lC/cm 2 , while the dielectric constant was found to be very high (e 0 r C 10 2 , for T C 140°C). Along with strong conductivity contribution to e 0 r , spectroscopic plots of e 0 r revealed the MaxwellWagner type relaxation in the sample, which ultimately could have led to an apparent high e 0 r in 95BFO-5BT ceramics. Origin of such a high e 0 r in BFO-BT was further investigated using impedance spectroscopy. MD studies revealed the magneto-electric coupling in the ceramics. The MD studies along with anomaly in dielectric data near antiferromagnetic ordering temperature (T N = 170°C) of BFO suggests the magnetic bearing on the electrical properties of 95BFO-5BT ceramics.

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“…With Table 4 Refined structural parameters of (1 -x)(0. incorporation of PT content, the value of dielectric constant is increased for the composites, and also the reduction in dielectric loss has been observed. The increase of dielectric constant and decrease of average dielectric loss with addition of PT content is believed to be caused by improved densification (given in Tables 1, 2) in the ceramic composites with addition of PT [31,32]. Fig.…”

Section: Dielectric Measurementsmentioning

confidence: 93%

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

2014

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Three-phase magnetoelectric composites (1 -x) (0.7BiFeO 3 -0.3CoFe 2 O 4 )-xPbTiO 3 (or equivalently written as (1 -x)(0.7BFO-0.3CFO)-xPT) with x variations 0, 0.30, 0.35, 0.40, 0.45, and 1.0 were synthesized using hybrid processing route. The effects of PT addition on structural, multiferroic, and optical properties have been subsequently investigated. A detailed Rietveld refinement analysis of X-ray diffraction patterns has been performed, which confirms the presence of structural phases of individual constituents in the composites. Field emission scanning electron microscopy images are taken for microstructural analysis and grain size determination. Transmission electron microscopy analysis of 0.3CFO-0.7BFO reveals the average particle size to be lying in the window of 10-15 nm. The temperature-dependent dielectric constant at various frequencies (1, 10, 50, 100, and 500 kHz) has been studied, and the dielectric study reveals the increase of dielectric constant and decrease of average dielectric loss of composites with incorporation of PT content. Room temperature ferromagnetic behavior of composites is confirmed through the observation of magnetization versus magnetic field (M-H) hysteresis loops. The variation of magnetization with temperature indicates the presence of spin glass behavior in composites. Magnetoelectric coupling is evidenced in the composites through the observation of dependence of the dielectric constant on magnetic field, and magnetodielectric response of 2.05 % is observed for 45 mol% addition of PT content. The fractional change of magnetic field-induced dielectric constant can also be expressed as De r * cM 2 , and the value of c is found to be *1.08 9 10 -2 (emu/g) -2 for composite with x = 0.40. Fourier transformed infrared spectroscopy of samples is carried out to analyze various bonds formation in the composites.

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Dielectric Properties of BaTiO₃-Modified BiFeO₃Ceramics

Cited by 27 publications

References 18 publications

BaTiO₃–BiYbO₃perovskite materials for energy storage applications

BaTiO₃–BiYbO₃perovskite materials for energy storage applications

Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

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Dielectric Properties of BaTiO3-Modified BiFeO3Ceramics

Cited by 27 publications

References 18 publications

BaTiO3–BiYbO3perovskite materials for energy storage applications

BaTiO3–BiYbO3perovskite materials for energy storage applications

Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

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Dielectric Properties of BaTiO₃-Modified BiFeO₃Ceramics

BaTiO₃–BiYbO₃perovskite materials for energy storage applications

BaTiO₃–BiYbO₃perovskite materials for energy storage applications