Structural, dielectric, ferromagnetic, ferroelectric and ac conductivity studies of the BaTiO3–CoFe1.8Zn0.2O4 multiferroic particulate composites

Sharma, Richa; Pahuja, Poonam; Tandon, R. P.

doi:10.1016/j.ceramint.2014.01.115

Cited by 94 publications

(31 citation statements)

References 40 publications

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“…The dielectric loss is mainly caused by relaxation polarization and leakage conductance. When the frequency of the external electric field increases by a certain value, the relaxation polarization cannot keep up with the change of the external electric field, so the dielectric loss is reduced [21,31]. The curve fluctuation of the sample with the molar ratio of 2:1 is not obvious, which may be due to the less relaxation polarization induced by impurities in the sample.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

Qin

et al. 2019

PAC

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Co 0.5 Zn 0.5 Fe 2 O 4 /Ba 0.8 Sr 0.2 TiO 3 (CZFO/BST) composite ceramics with different molar ratios (1:3, 1:2, 1:1, 2:1 and 3:1) were prepared by combining chemical co-precipitation and sol-gel method. Effects of molar ratio on the microstructure, dielectric and multiferroic properties were investigated. The formation of the individual phases and the composites was confirmed by XRD results and small amount of secondary phase (Ba 2 Fe 2 Ti 4 O 13 ) was observed. The grain sizes of magnetic (CZFO) and ferroelectric phase (BST), measured by SEM, were about 5 µm and 0.5 µm, respectively. The sample with molar ratio (1:2) has the largest dielectric constant, while the sample with molar ratio (3:1) shows the lowest dielectric constant. A distinct loss peak can be observed for all the samples. Both the peak position and peak intensity increase with the frequency, indicating relaxation polarization process generated by space charge or interface polarization. The ceramics with molar ratio (1:1) shows the smallest leakage current (∼ 10 −7 A/cm at 1.5 kV/cm), while the leakage current (∼ 10 −5 A/cm at 1.5 kV/cm) of the sample with molar ratio (3:1) is the largest. The ferroelectric hysteresis loop is not apparent due to the low Curie temperature of the ferroelectric phase, but the sample with molar ratio (2:1) shows the best ferroelectric properties. It was found that with the increase of CZFO content, the values of saturation (M s ) and remnant (M r ) magnetization increase at first and then decrease. The sample with molar ratio (3:1) has the maximum M s value (about 50.34 emu/g), while the sample with molar ratio (1:2) shows the minimal M r value (about 0.46 emu/g). This anomalous magnetic property is induced by the interface interaction between the two phases. (Wei Cai) sult, these materials have fascinated many researchers for their ability to perform different functions simultaneously. They are promising candidates for potential use in many new-type and multi-functional devices, such as spintronic devices, transducer, storage, capacitor etc. [4][5][6]. In recent years, in order to develop materials with new multi-functionality, multiferroics exerts a tremendous fascination of researchers. Although the ME coupling effect has been reported in single phase materials for many years, it is usually very weak at room temperature, limiting their practical applications. In general, this weak ME effect is result of the low Curie temperature (T C ) of the single phase multiferroic materials. The Curie temperatures of most single phase multiferroic materials are far below room temperature, thus the

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Section: Dielectric Propertiesmentioning

confidence: 99%

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

Qin

et al. 2019

PAC

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“…36 The peaks will shift to high-temperature regions as the frequency increases because of the thermally activated relaxation mechanism. 38,39 According to the Arrhenius law, 40 the relaxation time is plotted versus temperature in Fig. 5 inset.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…4), yielding values of 1. 38,41 In addition to the temperature, the frequency is another important factor affecting the dielectric properties of the samples. Figure 5 shows the dielectric loss (tan d) and dielectric constant (e r ) of the ceramics with different Al 2 O 3 contents as functions of frequency at room temperature.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Qin

Zhou

et al. 2021

Journal of Elec Materi

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Magnetoelectric composites have attracted widespread attention during the past few decades due to their strong magnetoelectric coupling effect and potential applications above room temperature. Ni 0.5 Zn 0.5 Fe 2 O 4 /Ba 0.8 Sr 0.2-TiO 3 composites have been prepared by the conventional high-temperature solid-state method and the effects of Al 2 O 3 addition on their microstructure, dielectric, ferroelectric, and magnetic properties studied. x-Ray diffraction (XRD) analysis confirmed the biphase structure of the composites. scanning electron microscopy (SEM) showed that addition of a certain amount of Al 2 O 3 can enhance the density and promote uniform growth of particle size. The sample with 1 wt.% Al 2 O 3 addition exhibited the largest dielectric constant and lowest dielectric loss (< 0.05 at 1 kHz) at high temperature (> 354°C). The sample with 3 wt.% Al 2 O 3 addition presented the best ferroelectric properties, with the highest values of residual polarization (P r = 2.2150 lC/ cm 2 ) and coercive field (E c = 30.6527 kV/cm) among the specimens. The remanent magnetization (M r ) and saturated magnetization (M s ) decreased with increasing Al 2 O 3 content. In short, addition of Al 2 O 3 caused changes in the grain size, density, and defects, and addition of a certain amount of Al 2 O 3 can improve the magnetoelectric properties.

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“…In contrast, the value is close to zero with the Debye relaxation model; therefore, it can be inferred that the mechanism of xCCFO-y(BTO-BA) composite ceramics is the Maxwell-Wagner model from Figure 5b,d,f,h, which has been investigated by other groups as well. [20,[22][23][24][25][26][27][28] The dielectric constant of the specimens decreases first and then increases with the increase of y. This nonlinear change can be elucidated by the function phase (ferromagnetic or ferroelectric phase).…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Microstructure, Magnetodielectric, and Multiferroic Properties of xCo_0.8Cu_0.2Fe₂O_4−y(0.8BaTiO₃–0.2BiAlO₃) Composite Ceramics

Zeng

Xing

et al. 2021

Adv Eng Mater

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Herein, xCo 0.8 Cu 0.2 Fe 2 O 4Ày (0.8BaTiO 3 -0.2BiAlO 3 ) [xCCFO-y(BTO-BA)] (x ¼ 0, y ¼ 1; x ¼ 1, y ¼ 1; x ¼ 1, y ¼ 2; x ¼ 1, y ¼ 4; x ¼ 1, y ¼ 6) magnetoelectric composite ceramics are synthesized by solid-state method. The effects of composition on the microstructure, dielectric, ferroelectric and magnetic properties are systematically investigated. Two-phase structures were confirmed by X-ray diffraction patterns, which correspond to (BTO-BA) and CCFO phases; a little impurity can be found, and this low-concentration secondary phase is indexed as BaFe 12 O 19 . By scanning electron microscopy, it is found that all the samples show a uniform and relatively dense surface, while the grains show two different kinds of shapes and sizes, which are related with ferroelectric-phase BTO-BA and magnetic-phase CCFO. The average grain size of BTO-BA is %0.47 μm, and that of CCFO increases with increasing concentration of BTO-BA, and the size of BTO-BA is suppressed with the addition of CCFO. With decreasing the concentration of CCFO, the composites show more and more obvious magnetodielectric effect. The Curie temperature of BTO-BA ceramics is around 150 C, but this value increases (higher than 150 C) with the addition of CCFO, implying practical application in high-temperature devices. The ferroelectric properties of composite ceramics can be optimized by adding BTO-BA.

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Structural, dielectric, ferromagnetic, ferroelectric and ac conductivity studies of the BaTiO3–CoFe1.8Zn0.2O4 multiferroic particulate composites

Cited by 94 publications

References 40 publications

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Microstructure, Magnetodielectric, and Multiferroic Properties of xCo_0.8Cu_0.2Fe₂O_4−y(0.8BaTiO₃–0.2BiAlO₃) Composite Ceramics

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Structural, dielectric, ferromagnetic, ferroelectric and ac conductivity studies of the BaTiO3–CoFe1.8Zn0.2O4 multiferroic particulate composites

Cited by 94 publications

References 40 publications

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

Microstructure, Magnetodielectric, and Multiferroic Properties of xCo0.8Cu0.2Fe2O4−y(0.8BaTiO3–0.2BiAlO3) Composite Ceramics

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Microstructure, Magnetodielectric, and Multiferroic Properties of xCo_0.8Cu_0.2Fe₂O_4−y(0.8BaTiO₃–0.2BiAlO₃) Composite Ceramics