Relevant bibliographies by topics / Composite dielectric constant impedance spectroscopy powder XRD

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Academic literature on the topic 'Composite dielectric constant impedance spectroscopy powder XRD'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Composite dielectric constant impedance spectroscopy powder XRD"

1

Abraham, Kevin, A. K. Thomas, Jini Thomas, and K. V. Saban. "Steady nature of dielectric behaviour in Sm1.5Sr0.5NiO4 – CCTO composites." Modern Electronic Materials 5, no. (4) (2019): 145–50. https://doi.org/10.3897/j.moem.5.46694.

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The composite materials of 0.5 Sm<sub>1.5</sub>Sr<sub>0.5</sub>NiO<sub>4</sub>, 0.5 CCTO and 0.75 Sm<sub>1.5</sub>Sr<sub>0.5</sub>NiO<sub>4,</sub> 0.25 CCTO mixtures were prepared through the conventional solid state reaction in an attempt to obtain good dielectric properties for practical applications. The structural properties were determined by powder X-ray diffraction and single phases were obtained for Sm<sub>1.5</sub>Sr<sub>0.5</sub>NiO<sub>4</sub> and CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> compounds. The dielectric studies analysed over a range of frequencies (100 KHz–10 MHz) and temperatures (30 to 200 °C) revealed a desired dielectric constant values with a low steady nature of dielectric loss factor. Through impedance spectroscopy, the attained dielectric behaviour was due to the highly insulating grain boundaries at lower frequencies and semiconducting grains at higher frequencies.
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2

Bharathi, M., K. N. Anuradha, and M. V. Murugendrappa. "Structural, AC conductivity, dielectric and impedance studies of polypyrrole/praseodymium calcium manganite nanocomposites." Digest Journal of Nanomaterials and Biostructures 18, no. 1 (2023): 343–65. http://dx.doi.org/10.15251/djnb.2023.181.343.

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In-situ polymerization of a series of nanocomposites viz. 10, 20, 30, 40 and 50 wt % of Praseodymium Calcium Manganite Oxide (Pr0.75Ca0.25MnO3) (PCM) nano manganites in polypyrrole (PPy) were prepared by chemical polymerization technique. The crystalline nature of all the nanocomposites was confirmed by powder X-ray diffraction (XRD). The orthorhombic structure with space group Pnma was confirmed by the well-fitted Rietveld refined XRD data. The average particle size was observed to be in the range of 42 to 60 nm. Scanning Electron Microscope (SEM) confirmed the spherical nature of the particles. The TEM confirmed the crystallinity and Fourier Transform Infra-Red Spectroscopy (FTIR) showed that the stretching frequencies shifted towards higher frequencies for the nanocomposites suggesting better conjugation due to chemical interaction between the PPy and PCM particles. AC conductivity versus frequency showed that at higher frequencies the AC increases obeying Jonscher’s power law. The correlated barrier hopping (CBH) model is therefore used to describe the conduction mechanism. For all composites, the dielectric constant and tangent loss revealed a frequency- and temperaturedependent character. The real and imaginary impedance were both frequency and temperature dependent. The impedance data were analyzed by fitting Nyquist plots using ZsimpWin software which confirmed non Debye type of behavior. This study highlights on the interactions between conduction processes, grain boundaries, and grains.
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3

Syed, Asad, Ashoka Siddaramanna, Abdallah M. Elgorban, D. A. Hakeem, and G. Nagaraju. "Hydrogen Peroxide-Assisted Hydrothermal Synthesis of BiFeO3 Microspheres and Their Dielectric Behavior." Magnetochemistry 6, no. 3 (2020): 42. http://dx.doi.org/10.3390/magnetochemistry6030042.

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Despite considerable efforts undertaken in a rapidly developing area of multiferroic research, synthesis of phase pure BiFeO3 is still a matter of intensive research. In this work, we report the shape-controlled synthesis of pure BiFeO3 microspheres via a facile hydrothermal route. The prepared BiFeO3 powder has been characterized using powder X-ray Diffraction (XRD), Differential Thermal analysis (DTA), Scanning Electron microscopy (SEM), and impedance spectroscopy. Powder XRD analysis confirms the formation of pure rhombohedrally distorted perovskite with R3c space group. Scanning electron micrograph revealed that the prepared BiFeO3 microspheres are nearly spherical in shape with uniform size distribution. The BiFeO3 microspheres exhibit a dielectric constant value of ~110 at 1000 KHz, which is higher than the BiFeO3 prepared by conventional solid-state reaction and sol–gel method. Variation of dielectric constant with temperature at different frequencies shows that the BiFeO3 has a dielectric anomaly of ferroelectric to paraelectric type at 1093 K and this phenomenon is well supported by TGA results.
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4

Abraham, Kevin, A. K. Thomas, Jini Thomas, and K. V. Saban. "Steady nature of dielectric behaviour in Sm1.5Sr0.5NiO4 – CCTO composites." Modern Electronic Materials 5, no. 4 (2019): 145–50. http://dx.doi.org/10.3897/j.moem.5.4.46694.

Full text
Abstract:
The composite materials of 0.5 Sm1.5Sr0.5NiO4, 0.5 CCTO and 0.75 Sm1.5Sr0.5NiO4, 0.25 CCTO mixtures were prepared through the conventional solid state reaction in an attempt to obtain good dielectric properties for practical applications. The structural properties were determined by powder X-ray diffraction and single phases were obtained for Sm1.5Sr0.5NiO4 and CaCu3Ti4O12 compounds. The dielectric studies analysed over a range of frequencies (100 KHz–10 MHz) and temperatures (30 to 200 °C) revealed a desired dielectric constant values with a low steady nature of dielectric loss factor. Through impedance spectroscopy, the attained dielectric behaviour was due to the highly insulating grain boundaries at lower frequencies and semiconducting grains at higher frequencies.
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5

Abraham, Kevin, A. K. Thomas, Jini Thomas, and K. V. Saban. "Steady nature of dielectric behaviour in Sm1.5Sr0.5NiO4 – CCTO composites." Modern Electronic Materials 5, no. 4 (2019): 145–50. http://dx.doi.org/10.3897/j.moem.5.46694.

Full text
Abstract:
The composite materials of 0.5 Sm1.5Sr0.5NiO4, 0.5 CCTO and 0.75 Sm1.5Sr0.5NiO4, 0.25 CCTO mixtures were prepared through the conventional solid state reaction in an attempt to obtain good dielectric properties for practical applications. The structural properties were determined by powder X-ray diffraction and single phases were obtained for Sm1.5Sr0.5NiO4 and CaCu3Ti4O12 compounds. The dielectric studies analysed over a range of frequencies (100 KHz–10 MHz) and temperatures (30 to 200 °C) revealed a desired dielectric constant values with a low steady nature of dielectric loss factor. Through impedance spectroscopy, the attained dielectric behaviour was due to the highly insulating grain boundaries at lower frequencies and semiconducting grains at higher frequencies.
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6

Manzoor, M. Z., Z. Batool, Y. Ali, et al. "Sol-gel synthesis of topological insulator bismuth selenide nanoparticles by using different solvents." Digest Journal of Nanomaterials and Biostructures 17, no. 2 (2022): 649–59. http://dx.doi.org/10.15251/djnb.2022.172.649.

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This paper reports about the Sol-Gel synthesis of Bismuth Selenide (Bi2Se3) nanoparticles by using different solvents (DMF, Ethanol and (DMF+Ethanol)) for their potential in topological insulators. Various characterization techniques: X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), photoluminescence (PL), and scanning electron microscope (SEM) were used to characterize the nano-powder. To get valuable information about dielectric behavior, AC impedance and conductivity were studied. The XRD measurements of Bismuth Selenide proved the crystalline form and orthorhombic crystal structure. The grain size (G) of Bismuth Selenide prepared in different solvents e.g., DMF, Ethanol, DMF+ Ethanol were calculated at 68 nm, 78 nm, and 84 nm respectively. FTIR study showed that the wavenumber corresponding to 660-800cm-1 represents the vibrational bands of Bismuth Selenide (Bi2Se3). Photoluminescence analysis revealed that the maximum absorption was at 801 nm and the bandgap was approximately 1.7eV for all the solvents. The surface morphology of the synthesized Bismuth Selenide (Bi2Se3) was studied with the help of a scanning electron microscope (SEM). The dielectric study showed the frequency effect on dielectric constant (έ), dielectric loss (Ɛ"), tangent loss (tanδ), impedance (Z), and AC conductivity.
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7

Lisińska-Czekaj, Agata, Joanna Micior, Małgorzata Adamczyk, and Dionizy Czekaj. "Dielectric Properties of BiNbO4-Based Ceramic-Polymer Composites with 0-3 Connectivity." Key Engineering Materials 602-603 (March 2014): 723–27. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.723.

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In the present study two-phase BiNbO4//PVDF composites with 0-3 connectivity were studied by impedance spectroscopy within the frequency range Δν=100Hz-1MHz at room temperature. Polyvinylidene fluoride (PVDF) acted as a matrix whereas bismuth niobate (BiNbO4) powder acted as a dispersed phase. The volume fraction of the ceramic phase was cV=2, 4, 6, 8, 10, 16 and 20vol%. Analysis of the impedance data registered for composites as well as for BiNbO4 ceramics and PVDF polymer was performed on the base of complex dielectric permittivity mathematical formalism. It was found by impedance spectroscopy that concentration of the dispersed phase had an effect on dielectric properties of ceramic-polymer composite. Experimental data of impedance spectroscopy were fitted to the corresponding equivalent circuit using the complex non-linear least squares method. An equivalent electric circuit consisting of a series combination of two parallel combinations of a resistance R and a constant phase element CPE was found to describe well the dynamic dielectric response of the objects under study. Parameters of the equivalent electric circuit were calculated and it was found that two distinct relaxation processes were present in the composite samples. It was also found that volume fraction of the dispersed phase cV=8vol% corresponded to a local minimum of resistance whereas cV=10vol% of the dispersed phase corresponded to a local minimum of capacitance.
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8

Winie, Tan, Asheila Jamal, Nur Shazlinda Muhammad Hanif, and N. S. M. Shahril. "Hexanoyl Chitosan-Polystyrene Blend Based Composite Polymer Electrolyte with Surface Treated TiO2 Fillers." Key Engineering Materials 594-595 (December 2013): 656–60. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.656.

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Composite polymer electrolytes (CPEs) comprised of hexanoyl chitosan-polystyrene-LiCF3SO3-TiO2 were prepared by solution casting technique. The TiO2 fillers were treated with 4% sulphuric acid (H2SO4) aqueous solution. The effect of treated TiO2 on the structural and electrical behaviour of the prepared electrolyte systems was investigated by X-ray diffraction (XRD) and impedance spectroscopy, respectively. Addition of TiO2 decreases the crystallinity of the electrolytes. Ac conductivity was calculated from σ(ω) = εoεrωtanδ. It is found that at all frequencies, σ(ω) increases with increasing temperature. Dielectric constant decreases with increasing frequency and increases with increasing temperature.
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9

Baivier, Clara, Imen Hammami, Ratiba Benzerga, Manuel P. F. Graça, and Luís C. Costa. "Barium Titanate/Gadolinium Ferrite: A New Material Composite to Store Energy." Nanomaterials 13, no. 13 (2023): 1955. http://dx.doi.org/10.3390/nano13131955.

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This work investigates the dielectric properties of barium titanate/gadolinium ferrite ceramic composites, with different concentrations of each material. Our objective was to increase the storage ability of this material, finding a compromise between high permittivity and low dielectric losses. A two-step sintering procedure was used in the preparation of the composites to attain the desired results. Their morphological, structural and electrical properties were tested using scanning electron microscopy, X-Ray powder diffraction and impedance spectroscopy, respectively. Dielectric characterizations were performed on the frequency band of 100 Hz–1 MHz and for different temperatures (180–380 K). The best compromise between barium titanate and gadolinium ferrite in the composition was calculated in order to obtain a potential material for electrical energy storage. The sample with 25% gadolinium ferrite presented the best results. The dielectric constant reached values of the order of 2000, at 1 kHz and 340 K. It was also important not to have very high losses, and this was confirmed by the calculated loss tangent.
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10

Sultan, M. Tipu, Md Arifur Rahman, Jahid M. M. Islam, et al. "Preparation and Characterization of an Alginate/Clay Nanocomposite for Optoelectronic Application." Advanced Materials Research 123-125 (August 2010): 751–54. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.751.

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Sodium Alginate/bentonite clay composites of different compositions were prepared by solution casting method. The electrical properties (Conductivity, Dielectric constant) of the composites were investigated by standard methods with Impedance Analyzer. The electrical properties were found to improve with the incorporation of bentonite clay. The thermal, physical and mechanical properties of sodium alginate/bentonite clay composite were investigated by Thermo-Mechanical Analyzer (TMA), X-ray Deffraction (XRD), and Universal Testing Machine respectively. . Tensile Strength (TS) and Elongation at break (Eb) of 2% clay containing composite film were found to be 7.6 MPa and 55% respectively. The XRD demonstrates the enhancing crystallinity of sodium alginate/bentonite clay composite with the increasing clay content. TMA results showed a higher thermal stability in the composite. Water absorption properties of the sodium alginate/clay composite were studied and found to decrease with the increase of clay content. . The inter action between sodium alginate and bentonite clay were studied by Fourier transform infrared spectroscopy (FT-IR). All of the results indicate that the developed composite is promising for use in a wide variety of optoelectronic applications.
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