Structural, Bulk Permittivity, and Magnetic Properties of Lead-Free Electronic Material: Ba1Bi1Cu1Fe1Ni1Ti3O12

Sahu, Madhusmita; Hajra, Sugato; Choudhary, R. N. P.

doi:10.1007/s10948-019-4996-5

Cited by 3 publications

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“…Alterations can additionally be observed in dielectric properties and usually they are explained by changes in size, shape and particle or grain boundaries [16][17][18]. Concerning dielectric properties, it is desired to produce a material with high value of dielectric constant (permittivity) and low value of dielectric loss [19][20][21][22]. High-κ dielectric materials are materials with high value of dielectric permittivity.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

et al. 2020

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Double perovskites have been extensively studied in materials chemistry due to their excellent properties and novel features attributed to the coexistence of ferro/ferri/antiferro-magnetic ground state and semiconductor band gap within the same material. Double perovskites with Sr2NiMO6 (M = Te, W) structure type have been synthesized using simple, non-toxic and costless aqueous citrate sol-gel route. The reaction yielded phase-pure nanocrystalline powders of two compounds: Sr2NiWO6 (SNWO) and Sr2NiTeO6 (SNTO). According to the Rietveld refinement of powder X-ray diffraction data at room temperature, Sr2NiWO6 is tetragonal (I4/m) and Sr2NiTeO6 is monoclinic (C12/m1), with average crystallite sizes of 49 and 77 nm, respectively. Structural studies have been additionally performed by Raman spectroscopy revealing optical phonons typical for vibrations of Te6+/W6+O6 octahedra. Both SNTO and SNWO possess high values of dielectric constants (341 and 308, respectively) with low dielectric loss (0.06 for SNWO) at a frequency of 1 kHz. These values decrease exponentially with the increase of frequency to 1000 kHz, with the dielectric constant being around 260 for both compounds and dielectric loss being 0.01 for SNWO and 0.04 for SNTO. The Nyquist plot for both samples confirms the non-Debye type of relaxation behavior and the dominance of shorter-range movement of charge carriers. Magnetic studies of both compounds revealed antiferromagnetic behavior, with Néel temperature (TN) being 57 K for SNWO and 35 K for SNTO.

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Section: Introductionmentioning

confidence: 99%

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

et al. 2020

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Protonation control of spin transport properties in magnetic single-molecule junctions

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Study of Structural, Dielectric, Electrical and Optical Properties of the Sr₃CuTi₄O₁₂ Ceramics

Parida

Jena

Sahu

et al. 2023

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In the present investigation, the synthesis of the strontium copper titanate [Formula: see text] ceramic by the cost-effective solid-state reaction was reported. The structural analysis suggests a single-phase tetragonal crystal symmetry with space group P4/mmm. The average crystallite size and mechanical compressive microlattice strain are found to be 65.8[Formula: see text]nm and 0.000594, respectively. The study of the field emission scanning electron microscope (FESEM) micrograph suggests that grains and grain boundaries are uniformly distributed on the sample surface with less porosity. The study of Raman lines suggests the presence of all constituent elements, which is well supported by EDAX analysis. The UV–Vis spectroscopy analysis shows that the bandgap of SCTO is about 3.2[Formula: see text]eV suitable for photovoltaic and other higher-temperature sensor applications. The decrease of dielectric constant with frequency supports the reduction of space charge polarization. The modulus analysis suggests that the immobile charge carriers at lower and defects and oxygen vacancies at higher temperatures are responsible for the thermally activated conduction process. The calculated activation energies are 4.54[Formula: see text]meV, 4.40[Formula: see text]meV, 3.39[Formula: see text]meV and 3.29[Formula: see text]meV at 1[Formula: see text]kHz, 10[Formula: see text]kHz, 100[Formula: see text]kHz and 1[Formula: see text]MHz; the decrease with the rise of the frequency confirms a thermally activated conduction process. Thermistor constant [Formula: see text], sensitivity factor [Formula: see text] and stability factor of the sample were calculated, which confirms the characteristics of the NTC thermistor. The Nyquist and Cole–Cole semicircular arcs confirm NTCR character and are found to be suitable applications for energy storage devices and thermistors.

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Structural, Bulk Permittivity, and Magnetic Properties of Lead-Free Electronic Material: Ba1Bi1Cu1Fe1Ni1Ti3O12

Cited by 3 publications

References 31 publications

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

Protonation control of spin transport properties in magnetic single-molecule junctions

Study of Structural, Dielectric, Electrical and Optical Properties of the Sr₃CuTi₄O₁₂ Ceramics

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Structural, Bulk Permittivity, and Magnetic Properties of Lead-Free Electronic Material: Ba1Bi1Cu1Fe1Ni1Ti3O12

Cited by 3 publications

References 31 publications

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

Protonation control of spin transport properties in magnetic single-molecule junctions

Study of Structural, Dielectric, Electrical and Optical Properties of the Sr3CuTi4O12 Ceramics

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Study of Structural, Dielectric, Electrical and Optical Properties of the Sr₃CuTi₄O₁₂ Ceramics