Negative permittivity behavior and magnetic performance of perovskite La1−xSrxMnO3at high-frequency

Yan, Kelan; Fan, Runhua; Shi, Zhicheng; Chen, Min; Qian, Lei; Wei, Yu-Lei; Sun, Kai; Li, Jing

doi:10.1039/c3tc31906g

Cited by 107 publications

(64 citation statements)

References 31 publications

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“…21 Negative permittivity, an interesting feature, has been observed in LSMO with variable Sr content. 22 Similarly, Zang and Cao reported microwave absorption in transition metal doped LSMO compounds. 23 In these studies, the shielding efficiency was high around a narrow frequency band.…”

Section: -13mentioning

confidence: 99%

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range

et al. 2015

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We report a detailed study on the electromagnetic interference (EMI) shielding effectiveness (SE) properties in La 0.7 Sr 0.3 MnO 3 (LSMO) nanomaterials. The samples were prepared by a solution chemistry (sol-gel) route at different sintering temperatures. The single-phase samples with grain sizes of 22 and 34 nm showed DC electrical conductivity variation from 0.65 to 13 S cm À1 at room temperature. The application of a high magnetic field resulted in higher conductivity values. The electrical conductivity variation with temperature could be fitted with a variable range hopping mechanism in a limited temperature range.The variation of frequency dependent electromagnetic parameters measured at room temperature within the X-band region is consistent with the electrical conductivity behavior. The complex permittivity and permeability parameters were determined in line with the Nicolson-Ross-Weir algorithm. The LSMO nanomaterial samples showed EMI shielding effectiveness values of up to 19 dB (96.3% attenuation) over the X-band frequency range, making them suitable for microwave radiation shielding in commercial and defense appliances.

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Section: -13mentioning

confidence: 99%

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range

et al. 2015

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“…With the increase of graphene content, the absolute values of the GR/PVA membranous composites increased, which was attributed to the enhanced electron density of the composites. The negative permittivity spectra conformed to Drude model,56 which can be described as follows:

ε_{r}^{'} (ω) = 1 - \frac{ω_{p}^{2}}{ω^{2} + ω_{τ}^{2}}

ω_{p} = \sqrt{\frac{n e^{2}}{m ε_{0}}}

where ω p and ω τ are the plasma oscillation angular frequency and collision angular frequency, n is the effective electron density, m is the effective mass, e is the electron charge, and ε 0 is the vacuum permittivity. The fitted data are shown in Figure 5b.…”

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 96%

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Sun

Wang

Xin

et al. 2020

Macro Materials & Eng

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In this work, a hydrosoluble matrix is used for the first time to prepare flexible membranous composites, in order to improve their environmental friendliness and simplify the processing. Modified graphene (GR) sheets are distributed in polyvinyl alcohol (PVA) solution to achieve flexible GR/PVA metacomposites. As graphene content increases, an interconnected graphene network is eventually formed among the PVA matrix, and the resulting composites present a conductor‐like behavior. Interestingly, the Drude‐like negative permittivity is obtained in the composites with 20 wt% graphene, which is ascribed to the plasma oscillation. Meanwhile, the absolute values of negative permittivity decrease by several orders of magnitude due to the moderate electron density of graphene. It is demonstrated that the negative permittivity is dependent on the inductive character. This work provides a novel and versatile approach based on water‐soluble matrices to prepare flexible membranous metacomposites, which can be applied in wearable cloaking, thin‐film capacitors, and flexible and stretchable devices.

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“…So the key challenge is to obtain required properties by control morphology and properties. A lot of research have been made on element doping (Sr [5,6], Pr [7], Al [8], etc.) and special morphology preparation, for instance BaFe 12 O 19 fibers [6], tubes [2,9], belts, etc.…”

Section: Introductionmentioning

confidence: 99%

“…A lot of research have been made on element doping (Sr [5,6], Pr [7], Al [8], etc.) and special morphology preparation, for instance BaFe 12 O 19 fibers [6], tubes [2,9], belts, etc. However, the coercivity data for these ferrites was several thousand which will also limit their application in which need high magnetization and low coercive force such as switching and sensing applications, electromagnetic materials, microwave absorbing materials and so on.…”

Section: Introductionmentioning

confidence: 99%

Formation and characterization of magnetic barium ferrite hollow fibers with low coercivity via co-electrospun

Liu

Zhang

Dang

et al. 2016

Journal of Magnetism and Magnetic Materials

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Negative permittivity behavior and magnetic performance of perovskite La_1−xSr_xMnO₃at high-frequency

Cited by 107 publications

References 31 publications

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Formation and characterization of magnetic barium ferrite hollow fibers with low coercivity via co-electrospun

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Negative permittivity behavior and magnetic performance of perovskite La1−xSrxMnO3at high-frequency

Cited by 107 publications

References 31 publications

Nanostructured La0.7Sr0.3MnO3compounds for effective electromagnetic interference shielding in the X-band frequency range

Nanostructured La0.7Sr0.3MnO3compounds for effective electromagnetic interference shielding in the X-band frequency range

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Formation and characterization of magnetic barium ferrite hollow fibers with low coercivity via co-electrospun

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Negative permittivity behavior and magnetic performance of perovskite La_1−xSr_xMnO₃at high-frequency

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range

Nanostructured La_0.7Sr_0.3MnO₃compounds for effective electromagnetic interference shielding in the X-band frequency range