Temperature-dependent ferromagnetic behavior in nanocrystalline ZnO synthesized by pyrophoric technique

Routray, Urmishree; Dash, Raj Kishora; Mohapatra, Jyoshnarani; Das, Josodhir; Srinivasu, V. V.; Mishra, Dilip Kumar

doi:10.1016/j.matlet.2014.08.109

Cited by 19 publications

(5 citation statements)

References 12 publications

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“…1 show the quantitative crystalline phase analysis by the Rietveld method for ZnO nanoparticles. All samples present a single phase belonging to the Wurtzite of ZnO structure, which is in well agreement with the data reported in previous papers [1,2]. Through the Rietveld refinement were determined the crystallite size (D) and the lattice parameters (a and c), Table 1.…”

Section: Resultssupporting

confidence: 89%

“…Zinc oxide is a semiconductor material that has attracted much attention due to its multiple properties and applications in electrooptical devices, gas sensor and diluted magnetic semiconductors [1]. Recently, several studies have investigated the origin of ferromagnetism observed in pure ZnO samples.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, several studies have investigated the origin of ferromagnetism observed in pure ZnO samples. Ferromagnetism (FM) in pure ZnO has been associated with several mechanism, such as oxygen vacancy (Vo), Zn vacancy, crystal defects, grain boundaries and lattice distortion [1][2][3]. Guo et al [2] prepared ZnO nanostructures with different morphologies by hydrothermal method and magnetic behavior was also associated to the presence of Vo.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Castro-Lopes¹,

Sousa²,

Santos³

et al. 2023

Anais Do Simpósio De Engenharia Metalúrgica E De Materiais Sul Fluminense

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In this work, we have studied the effects of temperature on the magnetic phase transitions in ZnO nanoparticles obtained by sol-gel method. The X-ray diffraction (XRD) analysis have shown a single phase, belonging to the hexagonal structure of ZnO. The magnetic measurements at 300 K, exhibit a ferromagnetic contribution in combination with a paramagnetic component for samples obtained at 600 °C, 800 °C and 1000 °C. A magnetic transition was verified for the sample obtained at 1200 °C, now with diamagnetic behavior. The sol-gel method is presented as an alternative to study the evolution of the different magnetic phases as a function of the degree of atomic disorder in ZnO nanoparticles.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Castro-Lopes¹,

Sousa²,

Santos³

et al. 2023

Anais Do Simpósio De Engenharia Metalúrgica E De Materiais Sul Fluminense

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“…12(a) show the zero local magnetic moments due to the high symmetry of the spin up and down partial total density of states. However, in order to explain the origin of roomtemperature ferromagnetism of a non-magnetic system such as ZnO, [29][30][31][32] CuO 33 or CaB 6 , [34][35][36][37] there are many available theoretical and experimental works predicting and explaining them in different manners; this is very similar to us. It is more commonly believed that the origin of ferromagnetism of non-magnetic compounds, in the absence of 3d or 4f electrons associated with magnetic order, is induced by intrinsic defects.…”

Section: Resultsmentioning

confidence: 83%

Effects of induced optical tunable and ferromagnetic behaviors of Ba doped nanocrystalline LaB₆

Bao

Tana

et al. 2016

Phys. Chem. Chem. Phys.

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Multiple nanocrystalline rare-earth hexaborides La1-xBaxB6 have been synthesized via a single step solid-state reaction. The Ba doping effects on crystal structure, grain morphology, magnetic and optical absorption properties were investigated using XRD, FESEM, HRTEM, SQUID magnetometry and optical measurements. The results show that all the Ba-doped hexaborides crystallize in the CsCl-type single phase, indicating the Ba atoms occupied the lattice sites of LaB6. The optical absorption results indicate that the absorption valleys of LaB6 are red-shifted from 622 nm to 780 nm when the Ba doping content increases to x = 0.8. The first-principle calculation results reveal that Ba doping reduces the total kinetic energy of the electrons of LaB6, which lead to the absorption valleys moving toward a higher wavelength. Meanwhile, the band gap of BaB6 obtained from optical absorption is in good agreement with the theoretical calculation results. The magnetic measurements results showed that Ba doping lead to room-temperature ferromagnetism of LaB6 due to the different ionic radii of La(3+) and Ba(2+) causing intrinsic crystal defects, which is directly observed experimentally by HRTEM. This is the first time that we have found the tunable optical and ferromagnetic behavior of Ba doped nanocrystalline LaB6. Thus, nanocrystalline La1-xBaxB6, as multi-functional materials, should open up a new route to extend the optical and magnetic applications of LaB6 nanopowder.

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“…these materials[15][16].The hysteresis 5b. The height and the the hysteresis loop in -Fig5b‖indicate an increase in the magnetic parameters, which is much larger than that of pure (ZnO).…”

mentioning

confidence: 97%

Role of magnetic nanoparticles incorporation for the enhanced efficiency of ZnO based Dye-Sensitized Solar Cells (DSSCs)

Abdallah,

Abdullah,

Jabbar

2023

UTJsci

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In this study, we reported on the effect of the internal magnetic field arising from magnetic particles added to zinc oxide in certain proportions, which led to an improvement in the performance of the dye solar cell, We found that the magnetic effect It is the main factor that improves the ability to transfer electrons generated from the separation process between (electron-hole) pairs, And reduce the process of reunification between electrons and holes, The efficiency of the cell with a pure electrode was (1.38%), while the highest efficiency we got after doping was when doping with a ratio (97%ZnO+3%MnCoFeO4) reached (1.7%), i.e. the percentage increase in efficiency (23%).

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Temperature-dependent ferromagnetic behavior in nanocrystalline ZnO synthesized by pyrophoric technique

Cited by 19 publications

References 12 publications

Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Effects of induced optical tunable and ferromagnetic behaviors of Ba doped nanocrystalline LaB₆

Role of magnetic nanoparticles incorporation for the enhanced efficiency of ZnO based Dye-Sensitized Solar Cells (DSSCs)

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Temperature-dependent ferromagnetic behavior in nanocrystalline ZnO synthesized by pyrophoric technique

Cited by 19 publications

References 12 publications

Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Magnetic transition induced by heat treatment in ZnO obtained by the sol-gel method

Effects of induced optical tunable and ferromagnetic behaviors of Ba doped nanocrystalline LaB6

Role of magnetic nanoparticles incorporation for the enhanced efficiency of ZnO based Dye-Sensitized Solar Cells (DSSCs)

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Product

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Effects of induced optical tunable and ferromagnetic behaviors of Ba doped nanocrystalline LaB₆