Synergistic effect of dielectric resonance and plasma oscillation on negative permittivity behavior in La1-Sr MnO3 single-phase ceramic

Sun, Kai; Yang, Pengtao; He, Qifa; Fan, Runhua; Wang, Zongxiang; Tian, Jiahong; Yang, Xuechun; Duan, Wenxin; Wu, Xinfeng; Wang, Zhongyang

doi:10.1016/j.ceramint.2021.12.049

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…As indicated above, the dielectric constant of all specimens stays positive up to the resonant frequency ( f r ) and negative above this frequency. 57 , 58 In the case of pure NBT, as the frequency increases, the dielectric constant increases steadily, then, in the vicinity of the anomaly noted A, it increases and reaches a maximum, at this frequency, which corresponds to the so-called resonance frequency ( f r ), and then decreases rapidly for a frequency in the vicinity of the anomaly B, known as antiresonance ( f a ). This particular type of peaking behavior is associated with resonance mechanisms.…”

Section: Resultsmentioning

confidence: 99%

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

et al. 2022

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Lead-free ceramic materials produced from bismuth sodium titanate (Na0.5Bi0.5TiO3, NBT)–bismuth potassium titanate (K0.5Bi0.5TiO3, KBT) have been developed through a solid-state reaction technique. The structural, dielectric, and piezoelectric characteristics of the ceramic materials were analyzed. Based on the XRD investigation, the morphotropic phase boundary (MPB) was determined for the composition (x (%) = 16 and 20). The effects of the KBT phase on the NBT lattice were examined using the charge density distribution. Furthermore, the dielectric properties indicated the presence of a negative dielectric constant (εr′) as a function of frequency between 1 kHz and 2 MHz. Negative permittivity was observed globally in the (1 – x)NBT–xKBT ceramic which reflects the effect of the dielectric resonance. The grain conduction effect is revealed through the complex impedance spectrum in the form of a semicircular arc within the Nyquist plot. In addition, the samples studied revealed a non-Debye relaxation phenomenon. The relaxation time was determined based on the Vogel-Fulcher law for all samples. DC conductivity was carried out on the ceramics material and revealed that the resistance decreases with increasing temperature indicating a negative temperature coefficient of resistance. The AC conductivity as a function of frequency for different temperatures suggests the presence of a thermally activated conduction mechanism. The activation energy has been determined based on the Arrhenius plot of the DC electrical conductivity as well as the relaxation frequency.

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Section: Resultsmentioning

confidence: 99%

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

et al. 2022

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“…To address these limitations, researchers have shifted their focus toward exploring negative permittivity in homogeneous or single-phase materials. Negative permittivity has been reported in various single-phase materials: Sr-doped LaMnO 3 , 6–8 Mn-doped Sr 2 SnO 4 , 9 Nb-doped Sr 2 MnO 4 , 10 Sb-doped SnO 2 , 11 and Sn-doped In 2 O 3 . 12 We have put continuous efforts into exploring single-phase materials to achieve negative permittivity at room temperature in pristine (undoped) compounds.…”

Section: Introductionmentioning

confidence: 99%

Establishing the correlation of negative permittivity and AC conductivity of La_2−xSr_xNiO₄ (x = 0, 0.1, 0.3, 1.0) for microwave shielding applications

Katheriya,

Nirala,

Upadhyay

2024

J. Mater. Chem. C

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“…To overcome the challenge with composites, efforts were made to find out systems with homogeneous composition i.e. mono-phase materials [16][17][18]. Negative permittivity in the radio frequency range has been reported in several undoped and doped metal oxides [19,20] and Perovskite oxides [17,21].…”

Section: Introductionmentioning

confidence: 99%

High temperature study of dielectric and electrical conduction behaviour of La₂NiO₄

Katheriya,

Upadhyay

2023

Phys. Scr.

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Materials showing negative permittivity have attracted considerable attention from researchers on account of their notable applications in electronic and electromagnetic devices. Discovering materials exhibiting negative permittivity is a challenging task. Very few single-phase oxides have been reported as negative permittivity materials. In this work, we have attempted to investigate the dielectric properties of La2NiO4 to explore the possibility of negative permittivity. To achieve the goal, powder, and ceramic of La2NiO4 have been synthesized by the conventional solid-state reaction method. Rietveld refinement of the X-ray diffraction data studies has confirmed the tetragonal structure and space group I4/mmm. The Dielectric properties and AC conductivity have been studied in the frequency range of 20 Hz–2 MHz and over a wide temperature range (30 °C–600 °C). The permittivity of La2NiO4 is found to be negative at all the measured frequencies and temperatures. The Drude model fitted the experimental data very well, suggesting that negative permittivity behavior can be assigned to the plasma oscillation of conducting electrons. The trend of AC conductivity with frequency is similar to the skin effect observed in metals. The variation of DC conductivity with temperature indicated small polaron hopping conduction mechanism. Analysis of reactance (Z′′) suggested inductive electrical character in the tested frequency and temperature range. Room temperature negative permittivity behavior of La2NiO4 makes it a potential candidate for practical electronic and electromagnetic devices that work in the Radio-frequency range. Furthermore, this work will add a new member to the family of Perovskite oxides showing tunable negative permittivity.

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Synergistic effect of dielectric resonance and plasma oscillation on negative permittivity behavior in La1-Sr MnO3 single-phase ceramic

Cited by 10 publications

References 32 publications

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Establishing the correlation of negative permittivity and AC conductivity of La_2−xSr_xNiO₄ (x = 0, 0.1, 0.3, 1.0) for microwave shielding applications

High temperature study of dielectric and electrical conduction behaviour of La₂NiO₄

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Synergistic effect of dielectric resonance and plasma oscillation on negative permittivity behavior in La1-Sr MnO3 single-phase ceramic

Cited by 10 publications

References 32 publications

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Establishing the correlation of negative permittivity and AC conductivity of La2−xSrxNiO4 (x = 0, 0.1, 0.3, 1.0) for microwave shielding applications

High temperature study of dielectric and electrical conduction behaviour of La2NiO4

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Establishing the correlation of negative permittivity and AC conductivity of La_2−xSr_xNiO₄ (x = 0, 0.1, 0.3, 1.0) for microwave shielding applications

High temperature study of dielectric and electrical conduction behaviour of La₂NiO₄