Dielectric properties and relaxation phenomena in the diffuse ferroelectric phase transition in K3Li2Nb5O15 ceramic

Belboukhari, A.; Abkhar, Z.; Gagou, Y.; Belhadi, Jamal; Elmoznine, R.; Mezzane, D.; Marssi, M. El; Luk’yanchuk, I.

doi:10.1140/epjb/e2012-21000-1

Cited by 24 publications

(6 citation statements)

References 35 publications

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“…The value of Z' sharply falls with an increasing frequency at lower frequency region (1-40 kHz). Then, the impedance spectrums amalgamate regardless to temperature at higher frequency division (40-1000 kHz), which was associated to the release of space charge and electrode effect [34]. The presence of decrement in barrier features with increasing temperature may also be associated with the increase of conductivity at higher frequencies [35].…”

Section: Real (Z') and Imaginary (Z'') Component Of Impedance Studymentioning

confidence: 93%

Structural, Electrical and Ferroelectric Properties of Lead-free Bi(Fe0.85dy0.15)o3 Electroceramic Compound

Thansanga

Shukla

Kumar

et al. 2021

Preprint

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This paper mainly reports detailed studies of structural, dielectric, impedance and ferroelectric properties of Bi(Fe0.85Dy0.15)O3 (termed as BFDO15), fabricated via solid state reaction (SSR) method. Analysis of X-ray diffraction (XRD) data confirm the crystal symmetry changes from rhombohedral to orthorhombic symmetry. The scanning electron micrograph collected through field emission scanning electron microscopy (FE-SEM) shows a regular distribution of grains over the sample surface. The elemental composition of the sample was examined by using energy dispersive X-ray micro-analysis (EDXMA) and this confirms the existence of constituent elements of the sample. The electrical measurement was carried out using a computer-controlled phase sensitive multimeter (PSM) in a frequency range of 1 kHz - 1000 kHz and temperature range of 25 ºC – 500 ºC. Study of dielectric properties shows high dielectric permittivity and small value of dielectric loss in the sample. The frequency dependent impedance and electrical modulus analysis reveals the presence of a semiconducting nature and non-Debye type relaxation process. Analysis of ac-conductivity with respect to frequency obeys the universal Jonscher’s power law. The electric polarization study shows enhancement in ferroelectric property of the material. Hence, based on the significant enhancement found in the structural, electrical and ferroelectric properties of BFDO15 material, it could be a promising candidate for modern device applications.

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Section: Real (Z') and Imaginary (Z'') Component Of Impedance Studymentioning

confidence: 93%

Structural, Electrical and Ferroelectric Properties of Lead-free Bi(Fe0.85dy0.15)o3 Electroceramic Compound

Thansanga

Shukla

Kumar

et al. 2021

Preprint

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“…The constant time s of grain and grain boundary relaxation are then obtained using the relationship given in Eq. (15). The effective grain and grain boundary parameters R g , R gb as well as the relaxation times s g and s gb as functions of temperature are shown in Fig.…”

Section: Complex Impedance Analysismentioning

confidence: 99%

“…The polycrystalline ceramic materials heterogeneity is the origin of a large variety of frequency-dependent effects [15]. The bulk material properties can be separated from the grain, the grain boundaries and electrodes contribution using the frequency-dependent impedance spectroscopy.…”

Section: Complex Impedance Analysismentioning

confidence: 99%

Diffuse phase transition and impedance spectroscopy analysis of Ba2.15−x Na0.7+x Nb5−x W x O15 (x = 0.25) ferroelectric ceramic

Neqali

Belboukhari²,

Bensaid³

et al. 2016

Appl. Phys. A

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A new rare earth ferroelectric tetragonal tungsten bronze compound with general formula Ba 2.15-xNa 0.7?x Nb 5-x W x O 15 (x = 0.25) was elaborated as ceramic and investigated using X-ray diffraction and dielectric measurements. The results show a tetragonal phase with the space group P4bm. Special emphasis was done to characterize diffuse phase transition (DPT) that occurs close to 472°C. Using dielectric measurements in a frequency range of (10 Hz-1 MHz) and in a temperature range (25-550°C), we have shown that the real part of the permittivity close to DPT is well described by Santos-Eiras phenomenological model. Space charge polarization, relaxation phenomena and free charges conductivity have been analyzed using dielectric, impedance spectroscopy and Nyquist plots showed non-Debye (polydispersive) type relaxation. In paraelectric phase, the Arrhenius activation energies were determined. Frequency dependence of ac conductivity at different temperatures follows the Jonscher's universal law (Jonscher et al. in J Mater Sci 20:4431, 1985).

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“…This behavior indicates the increase of alternating-current (AC) conductivity and frequency dependence of relaxation time. 23,31 Large values of Z¢ at low frequency are due to the space charge polarization. 23,31 At higher frequencies, the plots of Z¢ show the frequency independent behavior, which is due to the possible release of space charge and a consequent lowering of the energy barrier properties.…”

Section: Complex Impedance Analysismentioning

confidence: 99%

“…23,31 Large values of Z¢ at low frequency are due to the space charge polarization. 23,31 At higher frequencies, the plots of Z¢ show the frequency independent behavior, which is due to the possible release of space charge and a consequent lowering of the energy barrier properties. [32][33][34][35][36] There is a linear decrease in magnitude of Z¢¢ with increase in frequency for y = 0.00 at low temperatures (up to 473 K), which is similar to the plots of M¢¢ and can be explained in a similar way.…”

Section: Complex Impedance Analysismentioning

confidence: 99%

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

Puri

Bahel

Narang

2016

Journal of Elec Materi

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The purpose of the present study is to improve the dielectric properties of lead calcium iron niobate with Zr substitution, and to make it suitable for multilayer capacitor applications in resonant circuits. (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1Ày Zr y O 3 dielectric ceramics where y varies from 0.00 to 0.15 in steps of 0.03, that have been synthesized by the columbite precursor method. Dielectric and electrical properties were measured as a function of frequency (10 kHz to 1 MHz) and temperature. Two frequency dependent anomalies were observed in relative permittivity (e r ) versus temperature (T) plots around 375 K and between 500 K and 575 K. The temperature coefficient of relative permittivity, (s e ) has been improved with the substitution of (Fe 0.5 Nb 0.5 ) 4+ ions by Zr 4+ ions at B-sites. The single semicircle, observed in Nyquist plots at different temperatures, suggests a single relaxation process in the synthesized samples. The activation energies obtained from different dependences are found to be approximately comparable.

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Dielectric properties and relaxation phenomena in the diffuse ferroelectric phase transition in K3Li2Nb5O15 ceramic

Cited by 24 publications

References 35 publications

Structural, Electrical and Ferroelectric Properties of Lead-free Bi(Fe0.85dy0.15)o3 Electroceramic Compound

Structural, Electrical and Ferroelectric Properties of Lead-free Bi(Fe0.85dy0.15)o3 Electroceramic Compound

Diffuse phase transition and impedance spectroscopy analysis of Ba2.15−x Na0.7+x Nb5−x W x O15 (x = 0.25) ferroelectric ceramic

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

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