Preparation of zinc oxide nanopowders doped with manganese, which have ferromagnetic properties at room temperature.

Vorovsky, V. Yu.

doi:10.15407/fm25.01.061

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…Experimentally this prediction was proved in [3]. The results were obtained [4], which showed the existence of ferromagnetic properties in ZnO:Mn NC samples synthesized by aerosol spray pyrolysis (ASP) at room temperatures. These properties disappeared after annealing the samples in air at T = 800°C and depended on the technological conditions of synthesis.…”

Section: Introductionmentioning

confidence: 82%

Peculiarities of doping of ZnO:Mn nanocrystals during their synthesis by the aerosol pyrolysis method

et al. 2020

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Samples of ZnO:Mn nanocrystals with Mn concentrations of 2 and 4 at.% were synthesized by ultrasonic aerosol pyrolysis. The synthesis was carried out at 550°C using aqueous solutions of zinc and manganese nitrates. The samples obtained were subjected to heat treatment at 550°C and 850°C in air for 1 hour. The study of the samples by XRD and EPR methods shows that during the synthesis the process of doping ZnO nanocrystals with manganese occurs only partially, on the surface, in the near-surface layer. Residues of the Mn impurity are located on the surface of nanocrystals and appear during annealing at 550°С in the form of manganese oxides (Mn2O3). During heat treatment at 850°C, decomposition of Mn2O3 and bulk doping of ZnO:Mn nanocrystals occur.

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Section: Introductionmentioning

confidence: 82%

Peculiarities of doping of ZnO:Mn nanocrystals during their synthesis by the aerosol pyrolysis method

et al. 2020

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“…Nanoparticles are defined as small clusters of material, typically less than 100 nm in diameter. Nanoparticles offer many potentially interesting mechanical and chemical properties that differ from the bulk material [4]. These properties arise because of the high surface area to volume ratio inherent at the nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

AlCoCuFeNi high–entropy alloy nanoparticle melting and solidification: a classical molecular dynamics simulation study

Kushnerov

2019

JPhysElectron

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The processes of melting and solidification of AlCoCuFeNi nanoparticle of about 10 nm is studied by molecular dynamics simulation at three different cooling rates (1∙1011 K/s, 1∙1012 K/s, and 1∙1013 K/s) using the embedded atom model (EAM) potential. The melting and crystallization of the nanoparticle are characterized by studying the temperature dependence of the potential energy. The adaptive common neighbor analysis (CNA) is performed and the radial distribution function (RDF) is calculated to determine the structure and lattice parameters of phases of the AlCoCuFeNi nanoparticle. It is shown that the final structure of the investigated nanoparticle changes from amorphous to crystalline with decreasing of the rate of cooling, and the temperature hysteresis takes place during the melting and crystallization of AlCoCuFeNi HEA nanoparticle.

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“…3, b). The obtained data of the magnetization of Мs significantly exceed those in the samples of ZnO:Mn NC's synthesized by the method of ultrasonic pyrolysis of the aerosol [9]. The decrease in the magnetization of ZnO:Mn samples with increasing Mn concentration is explained by the fact that under such conditions some part of Mn 2+ impurity ions can interact directly with each other due to the reduction of the distance.…”

Section: Resultsmentioning

confidence: 73%

Ferromagnetic properties of ZnO:Mn nanocrystals obtained by the freeze-drying method

Коваленко¹,

Vorovsky²,

Хмеленко³

et al. 2020

JPhysElectron

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In the work, the nanocrystals ZnO and ZnO:Mn with a concentration of Mn 2 and 4 at.% were obtained by the low-temperature freeze-drying method. For this purpose, solutions of zinc acetate Zn(CH3COO)2∙2H2O and manganese one Mn(CH3COO)2∙4H2O were used. By means of XRD, it is established that nanocrystals (NC’s) have a pure phase and wurtzite-type hexagonal lattice, their size is d ~ 65 nm. The EPR spectra of the samples have a broad absorption line. It is due to the presence of a large number of intrinsic and impurity defects in the NC’s. These defects are the result of the destructive action of hydrogen, which is a product of the thermal decomposition of zinc and manganese acetates. It is shown that there is a relationship between the number of crystal lattice defects in the ZnO:Mn NC’s and their ferromagnetic properties at room temperature. Samples of ZnO:Mn with a concentration of Mn 2 and 4 at.%. have a specific magnetization value of Мs equal to 0.089 and 0.045 emu/g, respectively. The results can have great potential in spintronic devices and spin-based electronics.

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Preparation of zinc oxide nanopowders doped with manganese, which have ferromagnetic properties at room temperature.

Cited by 11 publications

References 10 publications

Peculiarities of doping of ZnO:Mn nanocrystals during their synthesis by the aerosol pyrolysis method

Peculiarities of doping of ZnO:Mn nanocrystals during their synthesis by the aerosol pyrolysis method

AlCoCuFeNi high–entropy alloy nanoparticle melting and solidification: a classical molecular dynamics simulation study

Ferromagnetic properties of ZnO:Mn nanocrystals obtained by the freeze-drying method

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