Temperature and composition dependence of dielectric properties in Li–Cu ferrite

Mazen, S. A.; Dawoud, Hussein A.

doi:10.1016/s0254-0584(03)00200-1

Cited by 29 publications

(13 citation statements)

References 21 publications

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“…Decreasing the rate of dielectric constant value with frequency is observed to be very slow at higher frequencies, and the value reached to the lowest stable value at the highest frequency point, which is a very usual behavior for all dielectric materials. To date, many researchers have reported a similar dielectric behavior for multiferroic materials, 62 , 63 and our results are in good agreement with reported works. At low-frequency regions (∼100 Hz), the synthesized single-phase BFO exhibits a high value of dielectric constant (4000), and at higher-frequency regions (∼1 MHz) it exhibits a low dielectric constant value (136), which indicates that pure BFO is an excellent dielectric material at higher frequencies.…”

Section: Results and Discussionsupporting

confidence: 93%

Microwave-Assisted Solvothermal Route for One-Step Synthesis of Pure Phase Bismuth Ferrite Microflowers with Improved Magnetic and Dielectric Properties

et al. 2022

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The prototypical plum-free, one-phase multiferric ferrite BiFeO 3 (BFO) is solid, parallel, with a high ferroelectric Curie temperature and Neel temperature and antiferromagnetic and ferroelectric propagation. This work aims to synthesize pure-phase BFO in the quickest possible way. We followed the microwave-assisted solvothermal (MWAST) method to achieve pure-phase BFO in the shortest duration of 3 min. The experiment involves simple optimizations with KOH concentration and microwave power levels. The surface morphology along with magnetic properties of BFO synthesized via the MWAST method are altered with varying KOH concentrations and microwave (MW) power levels. Our X-ray diffraction findings reveal that the pure-phase BFO is formed at 800 W MW power, and the structural characterizations like transmission electron microscopy, field emission scanning electron microscopy with energy-dispersive X-ray analysis have displayed the formation of uniformly distributed spherical microflowers of pure-phase BFO exhibiting a single-crystalline nature. Besides, the magnetic measurements affirmed a reliable weak ferromagnetic behavior (magnetization ∼1.25 emu/g) in BFO synthesized at 800 W MW power. In addition, good dielectric behavior with low dielectric loss was accompanied by frequency-dependent dielectric studies indicating an excellent frequency response of the material, and also the room-temperature ferroelectric properties were studied using a ferroelectric analyzer. The polarization of pure-phase BFO increases with the applied electric field and exhibits unsaturated polarization–electric field loops due to leakage current. Moreover, the Fourier transform infrared spectrum of the synthesized material has indicated the pure-phase BFO, and the Raman data have elucidated the vibrational modes of BFO. Further, the analysis of X-ray photoelectron spectroscopy data has confirmed the presence of fewer Fe 2+ ions and oxygen vacancies in the pure-phase BFO. Therefore, the collective characterizations and detailed analysis of BFO material have revealed the uniqueness of the MWAST method in producing the pure-phase BFO in 3 min with improved magnetic and dielectric properties, and hence the BFO synthesized via the MWAST method can be a potential candidate for multiferroic applications.

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Section: Results and Discussionsupporting

confidence: 93%

Microwave-Assisted Solvothermal Route for One-Step Synthesis of Pure Phase Bismuth Ferrite Microflowers with Improved Magnetic and Dielectric Properties

et al. 2022

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“…These opposite local displacements cause and determine the dielectric polarization in Cu containing ferrites such that the peaks occurring at some temperatures can be attributed to a collective contribution to the polarization by two types of charge carriers. This was observed by many researchers in the field [21,22]. We can obviously observe those peaks in the sample of x = 0.2 at temperatures ≥355 K. For the sample of x = 0.4 they occur at temperatures ≥385 K. Whereas for the samples of x ≥ 0.6, those peaks can be observed at almost all temperatures, this may be attributed to the increase in Cu ion content for which -as mentioned before in the discussion of conductivity -the effect of a fraction of Cu ions on increasing conductivity -i.e.…”

Section: Resultssupporting

confidence: 57%

AC conductivity and dielectric properties of, Zn1−Cu Cr0.8Fe1.2O4 spinel ferrites

Elkestawy

2010

Journal of Alloys and Compounds

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“…The mechanism of dielectric polarization is similar to that of conduction and it has been concluded that the electron exchange interaction results in a local displacement of electrons in the direction of an electric field which determines the polarization [11]. The variation of dielectric constant with frequency of Al doped iron oxide samples at room temperature is shown in Fig due to the inability of electric dipoles to follow the fast variation of the alternating applied electric field and accordingly the friction between them will increase.…”

Section: Dielectric Propertiesmentioning

confidence: 95%

Studies on morphological and electrical properties of Al incorporated combusted iron oxide

Shinde

Bhosale

Rajpure

2011

Journal of Alloys and Compounds

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Temperature and composition dependence of dielectric properties in Li–Cu ferrite

Cited by 29 publications

References 21 publications

Microwave-Assisted Solvothermal Route for One-Step Synthesis of Pure Phase Bismuth Ferrite Microflowers with Improved Magnetic and Dielectric Properties

Microwave-Assisted Solvothermal Route for One-Step Synthesis of Pure Phase Bismuth Ferrite Microflowers with Improved Magnetic and Dielectric Properties

AC conductivity and dielectric properties of, Zn1−Cu Cr0.8Fe1.2O4 spinel ferrites

Studies on morphological and electrical properties of Al incorporated combusted iron oxide

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