Structural and dielectric studies for the conduction mechanism analyses of lithium-niobate oxide ferroelectric ceramics

Bachiri, A. El; Hasnaoui, M. El; Louardi, A.; Narjis, A.; Bennani, F.

doi:10.1016/j.physb.2019.07.002

Cited by 17 publications

(6 citation statements)

References 37 publications

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“…Generally, interfacial relaxation is masked by the phenomenon of conductivity and dielectric permittivity may reach high values at low frequencies. 19,20 To address this concern in the study of interfacial polarization, it was agreed to adopt the formalism of the "electrical modulus", originally initiated by McCrum et al 21 Macedo et al, 22 who used it for the inquiry of electrical relaxation phenomena in glass ionic conductors, and El Bachiti et al 23 used it for analyzing the relaxation process in ferroelectric ceramics. It was also used in polymers and biopolymers to study their relaxation conductivity.…”

Section: Introductionmentioning

confidence: 99%

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Belhimria

Samir

Boukheir

et al. 2021

Journal of Composite Materials

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Binary and ternary composites were synthesized using a polyester matrix reinforced by two types of carbon inclusions, namely, carbon nanotubes (CNT) and graphite (Gt) (CNT/Gt/Polyester). Thermal analyses were performed, using thermogravimetry and differential scanning calorimetry, which allowed us to observe significant changes in glass transition temperatures and degradation temperatures of the composites. Dielectric measurements were performed in a frequency range from 100 Hz to 1 MHz and temperature from –33 to 107°C. The dielectric permittivity values of the CNT/Gt/Polyester ternary composites, compared to the Gt/Polyester binary composites, indicate that the addition of CNT particles to the Gt/Polyester binary system significantly improved the dielectric permittivity, due to the enhanced interfacial polarization of the host matrix, while the frequency dependence of the electrical modulus spectra revealed a Maxwell–Wagner–Sillars dielectric relaxation process that was found to follow the Cole–Davidson approach.

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Section: Introductionmentioning

confidence: 99%

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Belhimria

Samir

Boukheir

et al. 2021

Journal of Composite Materials

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“…The calculated activation energy E a,σ on the Arrhenius plots of dc conductivity is 0.86–0.88 eV (Table S4 and Figure S7). The n <1 value indicates the translation motion of charge carriers with sudden hopping. , …”

Section: Resultsmentioning

confidence: 99%

“…The n <1 value indicates the translation motion of charge carriers with sudden hopping. 43,44 In order to explore the electrical transport phenomena in ceramics, frequency dependences of the electrical modulus were analyzed. Starting from 320 °C, the single M″ peak exists on the M″ = f(ν) dependence with a half maximum of 1.14, which indicates that the system is electrically homogeneous (Figure S8).…”

Section: Oxygen Ionic Conductivitymentioning

confidence: 99%

Magnocolumbites Mg_1–xM_xNb₂O_6−δ (x = 0, 0.1, and 0.2; M = Li and Cu) as New Oxygen Ion Conductors: Theoretical Assessment and Experiment

et al. 2022

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MgNb 2 O 6 with a columbite structure was theoretically predicted as a prospective oxygen ion conductor. This compound was successfully synthesized by the Pechini method. The Li-and Cu-doped samples Mg 1−x M x Nb 2 O 6−δ (x = 0.1 and 0.2; M = Li and Cu) were prepared in the same way. The columbite structure (Sp.gr. Pbcn) was formed for the samples with x = 0 and x(Cu) = 0.1 and 0.2, while Li-doping led to the formation of two-phase ceramics with Mg 1−x Li x Nb 2 O 6−δ and LiNbO 3 components. The lithium and copper doping led to a decreasing sintering temperature by 100−200 °C down to ∼1050 °C. For Mg 1−x Li x Nb 2 O 6−δ (x = 0, 0.1, and 0.2), the experiments revealed pure oxygen ion conductivity of σ ∼10 −5 Scm −1 at 800 °C, an activation energy E a,σ of 0.86 eV, and good stability in a wide range of temperature, oxygen partial pressure, and in an atmosphere of carbon dioxide. For the Cu-doped samples, mixed n-type electronic and oxygen ion (T > 400 °C) conductivity was determined up to 2 × 10 −3 Scm −1 at 800 °C with E a,σ = 0.21 eV at x(Cu) = 0.2.

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“…Thermally stimulated conduction and relaxation processes were confirmed by Arrhenius model study. 25 K. He et al reported the light emission characteristics of Yb/Nddoped lithium niobate in response to variations in temperature. 26 They developed Yb 3+ /Nd 3+ co-doped LiNbO 3 ceramics that exhibited thermally enhanced emission for use in a radiometric thermometer.…”

Section: Introductionmentioning

confidence: 99%

“…A. El. Bachiri et al investigated and reported on the structural and dielectric characteristics of lithium‐niobate ceramics 25 . The investigation of electrical conductivity and dielectric relaxation over a large frequency (1 Hz‐10 MHz) and temperature range (300‐1000°C) revealed the Jonscher power law in ac‐conductivity, implying a hopping process.…”

Section: Introductionmentioning

confidence: 99%

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications

Satyarthi,

Singh,

Verma

et al. 2024

Energy Storage

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This research article delves into the synthesis and characterization of Li(1‐x)Sm(x/3)NbO3 ceramic, employing a high‐energy ball milling process. The investigation explores the incorporation of Sm3+ at the Li+1 site across a range of compositions (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05). Structural analysis, using x‐ray diffraction (XRD) and Rietveld structural refinement, establishes that within the investigated composition range, no significant changes in the crystal structure are evident. The x‐ray photoelectron spectroscopy revealed the presence of oxygen vacancies as well as the stable oxidation state of different elements like O2−, Nb5+, Sm3+, and Li1+. At sintering temperature 1050°C, the average grain sizes vary approximately from 1.5 to 3.8 μm for different compositions with regular grain morphology. The UV‐Vis analysis reveals a noteworthy reduction in the band gap to 3.09 eV for the x = 0.01 composition. Photoluminescence studies exhibit distinct green, orange, and red bands, with the highest intensity observed for x = 0.01, showcasing promising optical properties. The dielectric permittivity of Sm‐substituted compositions surpasses the response of pure LiNbO3, demonstrating an increasing trend with temperature in the frequency range 100 Hz‐1 MHz intriguingly, no Curie temperature is observed up to 500°C for any composition. The polarization vs electric field hysteresis loop response highlights better polarization characteristics at the room temperature and maximum polarization is 0.66 μC/cm2 for the composition x = 0.05. The energy storage response of the developed compositions is investigated, which reveals a maximum efficiency of 46.64% for x = 0.04 in Li(1‐x)Sm(x/3)NbO3. The tunable optical properties, enhanced dielectric response, and notable energy efficiency of these high TC ceramics suggest their utility across diverse applications. These findings not only contribute to the understanding of functional ceramic materials but also pave the way for their optimized utilization in advanced technological applications, particularly in energy storage devices under nonambient conditions at high temperatures.

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Structural and dielectric studies for the conduction mechanism analyses of lithium-niobate oxide ferroelectric ceramics

Cited by 17 publications

References 37 publications

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Magnocolumbites Mg_1–xM_xNb₂O_6−δ (x = 0, 0.1, and 0.2; M = Li and Cu) as New Oxygen Ion Conductors: Theoretical Assessment and Experiment

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications

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Structural and dielectric studies for the conduction mechanism analyses of lithium-niobate oxide ferroelectric ceramics

Cited by 17 publications

References 37 publications

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Thermal and dielectric properties of carbon nanotubes/graphite/polyester ternary composites

Magnocolumbites Mg1–xMxNb2O6−δ (x = 0, 0.1, and 0.2; M = Li and Cu) as New Oxygen Ion Conductors: Theoretical Assessment and Experiment

Electrical and optical properties of environmental friendly Li(1‐x)Smx/3NbO3 ceramics for high‐temperature energy storage applications

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Product

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Magnocolumbites Mg_1–xM_xNb₂O_6−δ (x = 0, 0.1, and 0.2; M = Li and Cu) as New Oxygen Ion Conductors: Theoretical Assessment and Experiment

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications