Structural, dielectric, impedance and conductivity studies of Ba(Fe
 0.5
 Nb
 0.5
 )O
 3
 nanomaterial prepared by the mechanochemical method

Kumar, Ritesh; Narayan, A.; Pradhan, Lagen Kr.; Kar, Manoranjan; Singh, Narendra Kumar

doi:10.1080/00150193.2018.1528944

Cited by 2 publications

(5 citation statements)

References 30 publications

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“…The research presented in the literature shows that the BFN ceramic material has high DC electrical conductivity [ 17 , 19 ]. At room temperature, the resistivity values of the ceramic samples take average values, i.e.,: 1.29 × 10 5 Ωm (for BFN 10 MA), 9.35 × 10 5 Ωm (for BFN 20 MA), 2.29 × 10 6 Ωm (for BFN 40 MA), 1.67 × 10 6 Ωm (for BFN 60 MA), 3.26 × 10 6 Ωm (for BFN 75 MA), and 4.89 × 10 4 Ωm (for BFN 100 MA).…”

Section: Resultsmentioning

confidence: 99%

“…Activation energy value usually means the relaxations, which include the movement of cations due to the applied energy as well as the thermal motion of anions. The long-range hopping of oxygen ions between neighboring sites can be a possible cause of this type of relaxation [ 19 ]. Similar activation energy values of the BFN ceramics made by the SPS method were obtained in [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

“…These high dielectric constants are influenced by both extrinsic as well as intrinsic factors [16]. In order to improve the dielectric properties of the BFN materials, different technologies for obtaining ceramics are used [17][18][19][20][21][22][23][24][25], or modifiers are introduced into the base compound [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…The Mechanochemical Activation process is extensively utilized in powder metallurgy, the synthesis of nanocomposites, or pharmacology. In the case of the polycrystalline BFN, nanomaterial has been successfully synthesized via the mechanochemical method in [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…The research presented in the literature shows that the BFN ceramic material has high DC electrical conductivity[17,19].…”

mentioning

confidence: 99%

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Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

et al. 2021

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This paper investigates the impact of the technological process (Mechanochemical Activation (MA) of the powder in combination with the Spark Plasma Sintering (SPS) method) on the final properties of lead-free Ba(Fe1/2Nb1/2)O3 (BFN) ceramic materials. The BFN powders were obtained for different MA duration times (x from 10 to 100 h). The mechanically activated BFN powders were used in the technological process of the BFN ceramics by the SPS method. The measurements of the BFNxMA ceramic samples included the following analysis: Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), DC electrical conductivity, and dielectric properties. X-ray diffractions (XRD) tests showed the appearance of the perovskite phase of BFN powders after 10 h of milling time. The longer milling time (up 20 h) causes the amount of the perovskite phase to gradually increase, and the diffraction peaks are more clearly visible. Short high energy milling times favor a large heterogeneity of the grain shape and size. Increasing the MA milling time to 40 h significantly improves the microstructure of BFN ceramics sintered in the SPS technology. The microstructure becomes fine-grained with clearly visible grain boundaries and higher grain size uniformity. Temperature measurements of the BFN ceramics show a number of interesting dielectric properties, i.e., high values of electric permittivity, relaxation properties with a diffusion phase transition, as well as negative values of dielectric properties occurring at high temperatures. The high electric permittivity values predestines the BFNxMA materials for energy storage applications e.g., high energy density batteries, while the negative values of dielectric properties can be used for shield elements against the electromagnetic radiation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The research presented in the literature shows that the BFN ceramic material has high DC electrical conductivity[17,19].…”

mentioning

confidence: 99%

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Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

et al. 2021

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The Influence of Lanthanum Admixture on Microstructure and Electrophysical Properties of Lead-Free Barium Iron Niobate Ceramics

Bochenek,

Brzezińska,

Niemiec

et al. 2024

Materials

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This article presents the research results of lead-free Ba1−3/2xLax(Fe0.5Nb0.5)O3 (BFNxLa) ceramic materials doped with La (x = 0.00–0.06) obtained via the solid-state reaction method. The tests of the BFNxLa ceramic samples included structural (X-ray), morphological (SEM, EDS, EPMA), DC electrical conductivity, and dielectric measurements. For all BFNxLa ceramic samples, the X-ray tests revealed a perovskite-type cubic structure with the space group Pm3¯m. In the case of the samples with the highest amount of lanthanum, i.e., for x = 0.04 (BFN4La) and x = 0.06 (BFN6La), the X-ray analysis also showed a small amount of pyrochlore LaNbO4 secondary phase. In the microstructure of BFNxLa ceramic samples, the average grain size decreases with increasing La content, affecting their dielectric properties. The BFN ceramics show relaxation properties, diffusion phase transition, and very high permittivity at room temperature (56,750 for 1 kHz). The admixture of lanthanum diminishes the permittivity values but effectively reduces the dielectric loss and electrical conductivity of the BFNxLa ceramic samples. All BFNxLa samples show a Debye-like relaxation behavior at lower frequencies; the frequency dispersion of the dielectric constant becomes weaker with increasing admixtures of lanthanum. Research has shown that using an appropriate amount of lanthanum introduced to BFN can obtain high permittivity values while decreasing dielectric loss and electrical conductivity, which predisposes them to energy storage applications.

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Structural, dielectric, impedance and conductivity studies of Ba(Fe _0.5 Nb _0.5 )O ₃ nanomaterial prepared by the mechanochemical method

Cited by 2 publications

References 30 publications

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

The Influence of Lanthanum Admixture on Microstructure and Electrophysical Properties of Lead-Free Barium Iron Niobate Ceramics

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Structural, dielectric, impedance and conductivity studies of Ba(Fe 0.5 Nb 0.5 )O 3 nanomaterial prepared by the mechanochemical method

Cited by 2 publications

References 30 publications

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

The Influence of Lanthanum Admixture on Microstructure and Electrophysical Properties of Lead-Free Barium Iron Niobate Ceramics

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Structural, dielectric, impedance and conductivity studies of Ba(Fe _0.5 Nb _0.5 )O ₃ nanomaterial prepared by the mechanochemical method