A comparative study on the structural, dielectric and multiferroic properties of Co0.6Cu0.3Zn0.1Fe2O4/Ba0.9Sr0.1Zr0.1Ti0.9O3 composite ceramics

Gao, Rongli; Zhang, Qingmei; Xu, Zhi; Wang, Zhenhua; Chen, Gang; Deng, Xiaoling; Fu, Chunlin; Cai, Wei

doi:10.1016/j.compositesb.2018.12.010

Cited by 168 publications

(25 citation statements)

References 24 publications

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“…The grain size, grain shape and some undetected impurities can influence magnetic properties to some extent and thus can affect the total magnetic behaviours in these composites. However, the abnormally enhanced magnetization of the sample (molar ratio is 1:3) can be deemed to be the result of strong interface interaction between the two phases [38], and this anomalous magnetic behaviour has also been observed in other magnetoelectric composites [17,19]. This stronger interaction may be due to the high content of BST phase.…”

Section: Magnetic Propertiesmentioning

confidence: 92%

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: Magnetic Propertiesmentioning

confidence: 92%

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

Qin

et al. 2019

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“…The dielectric loss in general includes three parts: the relaxation loss, conduction loss, and resonance loss [29]. Reference [29] gives a detailed description of the dielectric loss mechanism.…”

Section: Relative Permittivity and Dielectric Loss Factormentioning

confidence: 99%

Dielectric and space charge characteristics of nano-modified liquid silicone rubber for high-voltage DC cable accessories

Chen

Zhang

et al. 2020

J Mater Sci: Mater Electron

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In order to solve the problem of space charge accumulation in high-voltage DC cable accessories, nanometer titanium dioxide (TiO 2) doping method is used to improve the space charge performance of liquid silicone rubber (LSR). Conductivity, dielectric spectrum and DC breakdown field strength, space charge distribution, and the trap level distribution of nano-TiO 2 / LSR composite samples were tested in this paper. With the increase of the doping concentration of nanoparticles, the DC conductivity increased, and the DC breakdown field strength decreased. The ε r of the TiO 2 /LSR composite sample increased with the increase in the doping concentration of nano-TiO 2. As the frequency increased, tanδ decreased first in the lowfrequency region and then increased in the high frequency. When the electric field strength increases from 10 to 20 kV/mm, the same polarity charges appear near the upper and lower electrodes of the sample, and the space charge accumulation doubled. After the addition of nano-TiO 2 , under the two electric field strengths, the space charge accumulation of 4 wt%-TiO 2 / LSR composite materials decreased by 24.55 nc and 81.03 nc, respectively. The trap energy level of the 4 wt% nano-TiO 2 composites becomes smaller, and shallow traps are introduced, it was verified that the addition of 4 wt% nano-TiO 2 particles reduced the space charge inside the composite sample and achieved the effect of suppressing space charge.

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“…These data can account for the increase in the dielectric constant at 1 kHz because of the introduction of charge defects related to the multivalent Cr and Fe ions. The observed decrease in conductivity can be understood by considering the hopping mechanism, Fe 2+ ↔ Fe 3+ [39]. The increase in Cr 3+ ions at the B site leads to replacement of Fe 3+ ions at the B site, leading to a decrease in the number of ferrous ions formed.…”

Section: Dielectric Characterizationsmentioning

confidence: 99%

Temperature-dependent magnetic and electrical properties of Cr-doped AlFeO₃ ceramics

Raies

Dulmani

Farhat

et al. 2020

Journal of Asian Ceramic Societies

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The solid-state reaction method was selected to prepare polycrystalline AlFe 1−x Cr x O 3 (x = 0, 0.02, 0.05, 0.07 and 0.1) samples. The Samples were found to be pure phases possessing the orthorhombic space group Pna21. The unit cell volume decreased with increases in the Cr content. The magnetic transition temperature and the saturation magnetization of the ceramics decreased due to dilution of the magnetic interaction with Cr content. The Dielectric responses were systematically investigated by temperature-dependent dielectric/impedance spectroscopy from 160 K to 500 K. It was noticed that incorporation of Cr 3+ in the structure led to an increase in the dielectric constant up to x = 0.05 before decreasing, whereas the dielectric loss decreased. Two different dielectric relaxation processes that occurred in the grain interior of AlFe 1-x Cr x O 3 polycrystals were clarified. One relaxation process was thought to be associated with localized transfer of electrons between Fe 3+ and Fe 2+ , while the other arising at low temperature was assigned to interplay between lattice and polaronic defects such as oxygen vacancies.

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A comparative study on the structural, dielectric and multiferroic properties of Co0.6Cu0.3Zn0.1Fe2O4/Ba0.9Sr0.1Zr0.1Ti0.9O3 composite ceramics

Cited by 168 publications

References 24 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

Dielectric and space charge characteristics of nano-modified liquid silicone rubber for high-voltage DC cable accessories

Temperature-dependent magnetic and electrical properties of Cr-doped AlFeO₃ ceramics

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A comparative study on the structural, dielectric and multiferroic properties of Co0.6Cu0.3Zn0.1Fe2O4/Ba0.9Sr0.1Zr0.1Ti0.9O3 composite ceramics

Cited by 168 publications

References 24 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

Dielectric and space charge characteristics of nano-modified liquid silicone rubber for high-voltage DC cable accessories

Temperature-dependent magnetic and electrical properties of Cr-doped AlFeO3 ceramics

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Temperature-dependent magnetic and electrical properties of Cr-doped AlFeO₃ ceramics