Investigation of room temperature ferromagnetic behaviour in dilute magnetic oxides

Aggarwal, Nupur; Vasishth, Ajay; Singh, B. P.; Singh, Balwant

doi:10.1080/10584587.2017.1369317

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…It has been noted that this crystal structure can form a maximum theoretical amount of eight oxygen vacancies per unit cell. This is higher than for the rock salt and zinc blended structure [78,79], where a maximum theoretical amount of four oxygen vacancies per unit cell can be formed.…”

Section: Volatile and Non-volatile Redox Materialsmentioning

confidence: 77%

A Comprehensive Review on Two-Step Thermochemical Water Splitting for Hydrogen Production in a Redox Cycle

et al. 2022

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The interest in and need for carbon-free fuels that do not rely on fossil fuels are constantly growing from both environmental and energetic perspectives. Green hydrogen production is at the core of the transition away from conventional fuels. Along with popularly investigated pathways for hydrogen production, thermochemical water splitting using redox materials is an interesting option for utilizing thermal energy, as this approach makes use of temperature looping over the material to produce hydrogen from water. Herein, two-step thermochemical water splitting processes are discussed and the key aspects are analyzed using the most relevant information present in the literature. Redox materials and their compositions, which have been proven to be efficient for this reaction, are reported. Attention is focused on non-volatile redox oxides, as the quenching step required for volatile redox materials is unnecessary. Reactors that could be used to conduct the reduction and oxidation reaction are discussed. The most promising materials are compared to each other using a multi-criteria analysis, providing a direction for future research. As evident, ferrite supported on yttrium-stabilized zirconia, ceria doped with zirconia or samarium and ferrite doped with nickel as the core and an yttrium (III) oxide shell are promising choices. Isothermal cycling and lowering of the reduction temperature are outlined as future directions towards increasing hydrogen yields and improving the cyclability.

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Section: Volatile and Non-volatile Redox Materialsmentioning

confidence: 77%

A Comprehensive Review on Two-Step Thermochemical Water Splitting for Hydrogen Production in a Redox Cycle

et al. 2022

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“…The common reason responsible for magnetic response in the oxides is due to the existence of oxygen vacancy. For the continuation of steady magnetic behavior, extensive effort and inclusion of dopants must be demanding conditions in these oxides [97]. Due to doping of Mn is doped in ZnO, the shape and extent of the electron spin resonance (ESR) spectra are changed.…”

Section: Doping In Zno and Ferromagnetismmentioning

confidence: 99%

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

et al. 2020

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In recent years, many efforts have been made to develop advanced metal oxide semiconductor nanomaterials with exotic magnetic properties for modern applications w.r.t traditional analogues. Dilute magnetic semiconductor oxides (DMSOs) are promising candidates for superior control over the charge and spin degrees of freedom. DMSOs are transparent, wide band gap materials with induced ferromagnetism in doping, with a minor percentage of magnetic 3d cation to create a long-range antiferromagnetic order. Although significant efforts have been carried out to achieve DMSO with ferromagnetic properties above room temperature, it is a great challenge that still exists. However, TiO2, SnO2, ZnO and In2O3 with wide band gaps of 3.2, 3.6, 3.2 and 2.92 eV, respectively, can host a broad range of dopants to generate various compositions. Interestingly, a reduction in the size of these binary oxides can induce ferromagnetism, even at room temperature, due to the grain boundary, presence of defects and oxygen vacancies. The present review provides a panorama of the structural analysis and magnetic properties of DMSOs based on binary metal oxides nanomaterials with various ferromagnetic or paramagnetic dopants, e.g., Co, V, Fe and Ni, which exhibit enhanced ferromagnetic behaviors at room temperature.

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“…Therefore, cautious investigations are expected to set up the intrinsic and robust magnetism [26][27][28][29]. The present work focuses on repercussions of hydrogenation and then re-heating of Co-doped ZnO and In 2 O 3 specimens.…”

Section: Introductionmentioning

confidence: 99%

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Mukherji

Mathur

Samariya

et al. 2018

Adv Compos Hybrid Mater

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Nanocomposite samples of zinc oxide (ZnO) and indium oxide (In 2 O 3 ) doped with Co (at 1.5% molar concentration) are synthesized through conventional solid-state reaction technique. These samples are taken in a quartz tube and placed in reduction furnace for post-annealing in the presence of hydrogen for~10 h at around 550°C. The X-ray diffraction (XRD) study confirms the formation of hexagonal wurtzite structure for ZnO, Zn H exhibited a perceptible ferromagnetic behavior at 300 K whereas it overturns significantly after long air sintering. An effort has been made to fit the experiential M-H data of hydrogenated samples to the Bound Magnetic Polaron (BMP) model. MATLAB-based simulations have been performed to validate the homogeneity in particle distribution of the samples evinced through SEM micrographs. A multivariate assessment viz. hierarchical cluster analysis is also executed to corroborate and strengthen the experimental findings of magnetic properties.

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Investigation of room temperature ferromagnetic behaviour in dilute magnetic oxides

Cited by 10 publications

References 23 publications

A Comprehensive Review on Two-Step Thermochemical Water Splitting for Hydrogen Production in a Redox Cycle

A Comprehensive Review on Two-Step Thermochemical Water Splitting for Hydrogen Production in a Redox Cycle

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

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