Comparative study on structure, dielectric and electrical properties of cobalt- and zinc-substituted Mn3O4 spinels

Acharya, Nayana; Sagar, Raghavendra

doi:10.1007/s00339-020-03659-3

Cited by 13 publications

(1 citation statement)

References 37 publications

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“…77-0471) and ZMO (JCPDS card No. found in existing literature [20,34,35]. Both metal manganates share a tetragonal spinel structure (space group I 41/amd) featuring a John-Teller distortion induced by Mn 3+ ions within their octahedral surroundings.…”

Section: Xrd Analysismentioning

confidence: 80%

Zinc Manganite as an Efficient Battery-grade Material for Supercapattery Devices

Nagaraja,

Rao,

Rao

et al. 2024

Preprint

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In the current context, supercapatteries emerge as highly desirable candidates capable of merging both energy and power density within a single device. Battery-type metal oxide materials, combined with capacitive-based materials, stand out as promising candidates for high-performance supercapatteries. This investigation centers on the synthesis of nanocrystalline ZnMn2O4 (ZMO) and CoMn2O4 (CMO) through a straightforward hydrothermal method, followed by their physico-electrochemical characterization. Electrochemical analysis reveals that ZMO exhibits notably enhanced charge storage capability compared to CMO. This superiority can be attributed to favourable electro-structural properties, and stable redox chemistry of ZMO. The real-time performance of ZnMn2O4 was further assessed by fabricating a hybrid asymmetric supercapattery device (ZnMn2O4||NrGO), which achieves a specific capacity of 232 C g− 1 at a current density of 1 A g− 1. The hybrid asymmetric device underwent rigorous stability testing for 4000 cycles at a current density of 2 A g− 1, showcasing remarkable performance with a 92% retention of its initial capacity. The device demonstrated a power density of 10 kW kg− 1 and an energy density of 22 W h kg− 1, highlighting its considerable promise in the field.

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Section: Xrd Analysismentioning

confidence: 80%

Zinc Manganite as an Efficient Battery-grade Material for Supercapattery Devices

Nagaraja,

Rao,

Rao

et al. 2024

Preprint

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Investigation of the structural and the physical properties of ZnO–NiO–Mn2O3 nanocomposites for photocatalytic applications

et al. 2023

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Mg2+ Doped ZCFAO Spinel Ferrite: Structural, Optical, Dielectric and Magnetic Explorations

Moustafa,

Gad,

Hashem

2024

J Inorg Organomet Polym

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A series of Mg doped ZCFAO (Zn0.3−xMgxCu0.7Al0.3Fe1.7O4 (0.05 ≤ x ≤ 0.25) spinel samples were synthesized by solid state reaction method. XRD, was utilized to investigate the structure phase, microstructural characteristics, The optical properties were analyzed; Biological instruments Sp-150 potentiostate is employed to investigate the dielectric measurements in the frequency range of 10 Hz to 1 MHz at various temperatures from 300 to 650 K. Vibrating sample magnetometer VSM was employed to examine the magnetic characteristics in the applied magnetic field ranging from − 20 to 20 kG. The creation of a single-phase cubic spinel was validated by X-ray analysis. The leverage of replacing Zn by Mg leads to enhancement in the lattice parameters, reducing both of the degree of inversion, crystal distortion and compelled these samples to be normal spinel. It turned out that as the degree of inversion sank, the crystallite size declined. The values of dislocations density was found in the order of 10−5 which reveal improving and completing the crystallization of the ferrite samples. The samples have an optical energy gap in the range 3.1–3.38 eV, according to the inferred optical characteristics. The dielectric constant revealed the normal behavior of spinel ferrite it decreases with increasing frequency and enhanced with increasing temperature. It seems that the microstructure of the compound consists of both high-conductive grains and low-conductive grain boundaries, which has been confirmed by the complex impedance. Additionally, the presence of the Maxwell–Wagner relaxation process is also detected. This information can provide valuable insights into the properties and behavior of the compound. Using Nyquist plot, the sample impedance characteristics were interpreted while taking grain and grain boundary contributions into account. The magnetic properties proved that doping ZCFAO with diamagnetic cations (Mg) increases both of saturation magnetization from 16.416 up to 29.983 emu/g and the magnetocrystalline anisotropic constant from 1319.24 to 1612.804 because the two main factors that influence the magnetic properties are the distribution of cations between the octahedral and tetrahedral sites and the magnetic moment of each of its cations. Novelty of our work replacing Zn by Mg (both of them diamagnetic materials) enhance the magnetic properties. Synthesized materials may reexamine the mechanisms underlying Mg2+ induced cationic exchange in ZCFAO and have prospective uses as soft-magnetic materials.

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Comparative study on structure, dielectric and electrical properties of cobalt- and zinc-substituted Mn3O4 spinels

Cited by 13 publications

References 37 publications

Zinc Manganite as an Efficient Battery-grade Material for Supercapattery Devices

Zinc Manganite as an Efficient Battery-grade Material for Supercapattery Devices

Investigation of the structural and the physical properties of ZnO–NiO–Mn2O3 nanocomposites for photocatalytic applications

Mg2+ Doped ZCFAO Spinel Ferrite: Structural, Optical, Dielectric and Magnetic Explorations

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