Synthesis and structural, magnetic characterization of nanocrystalline Zn1−xMnxO diluted magnetic semiconductors (DMSs) synthesized by combustion reaction

Torquato, Ramon Alves; Shirsath, Sagar E.; Kiminami, R. H. G. A.; Costa, Ana Cristina Figueiredo de Melo

doi:10.1016/j.ceramint.2013.11.108

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…A simple synthesis route to prepare ferromagnetic DMS ZnO is the combustion reaction [10,11]. This process consists of a rapid and exothermic chemical reaction, useful in the production of many ceramic nanopowders.…”

Section: Introductionmentioning

confidence: 99%

Effect of doping and sintering in structure and magnetic properties of the diluted magnetic semiconductor ZnO:Ni

et al. 2018

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This work aimed to study a sintered Ni-doped ZnO dilute magnetic semiconductor synthesized by means of a combustion reaction and to evaluate the effect of doping and sintering in the band gap and magnetic properties of the material. X-ray diffraction showed the formation of the ZnO semiconductor phase and also the formation of a second-phase characterized as a solid solution of nickel-zinc oxide. The hysteresis curves showed the success in creating ferromagnetism with doping and the effect of sintering in the remanent magnetization and coercive field values, yet both systems were able to maintain its ferromagnetic behavior. The UV-vis analysis indicated the value of the band gap continued as a semiconductor material, although it has been narrowed. Scanning electron microscopy was used in a complementary way to evaluate the morphology and its effects on magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Effect of doping and sintering in structure and magnetic properties of the diluted magnetic semiconductor ZnO:Ni

et al. 2018

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“…The phases can be indexed as a mixture of RS Fm

\bar 3

m (JCPDS# 03‐065‐2901), wurtzite P 63 mc (ZnO, JCPDS#01‐076‐0704), tenorite C2/c (CuO, JCPDS#00‐041‐0254), and spinel Fd

\bar 3

m (Co 3 O 4 , JCPDS#01‐078‐1969) structures, which are commonly observed in starting powders of the RS:ESO synthesized via wet chemical routes 13,15,33 . These initial phases are consistent with the fact that Mg, Co, and Ni form RS oxides (being mutually soluble), whereas CuO and ZnO exhibit different crystal structures, presenting limited solubility in RS oxides 4,34,35 . Small intensity peaks are also detected at 2 θ = 4.95° and 5.70°, corresponding to the (1 1 1) and (2 0 0) Pt planes.…”

Section: Resultsmentioning

confidence: 99%

“…13,15,33 These initial phases are consistent with the fact that Mg, Co, and Ni form RS oxides (being mutually soluble), whereas CuO and ZnO exhibit different crystal structures, presenting limited solubility in RS oxides. 4,34,35 Small intensity peaks are also detected at 2θ = 4.95 • and 5.70 • , corresponding to the (1 1 1) and (2 0 0) Pt planes. These Pt peaks can serve as a reference to monitor the temperature of the sample surface since no other peaks from the constituent phases coincide in those positions.…”

Section: Phase Evolution During Conventional Heatingmentioning

confidence: 93%

Phase evolution during conventional and reactive flash sintering of (Mg,Ni,Co,Cu,Zn)O via in situ X‐ray diffraction

Yoon,

Campos,

Lavagnini

et al. 2023

J Am Ceram Soc.

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Reactive flash sintering (RFS) enables the simultaneous synthesis and sintering of ceramics and has been shown to affect the reaction pathway of different materials. Herein, in situ synchrotron X‐ray diffraction (XRD) is used to investigate the (Mg,Ni,Co,Cu,Zn)O entropy‐stabilized oxide formation during: (i) conventional heating and (ii) RFS under current rate‐controlled mode. The same reaction pathway is verified in both instances: the starting rock‐salt (RS), spinel (Co3O4), tenorite (CuO), and wurtzite (ZnO) phases transform into a single RS phase with a (1 1 1) to (2 0 0) intensity ratio of 0.67, consistent with a random distribution of the cations into the structure. Pt lattice peak shift from the XRD patterns is used as standard to monitor the sample surface temperature, revealing a strong endothermic reaction during the RS single‐phase formation (Pt peaks shift toward higher angles while increasing sample temperature/current density). In RFS, the single‐phase RS structure is formed in just 60 s at a furnace temperature of 600°C and a current rate of 220 mA mm−2/min. Therefore, RFS greatly accelerates the synthesis of (Mg,Ni,Co,Cu,Zn)O, however, it does not play a role in the reaction pathway for this material formation.

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“…The interest in ZnO for the development of these DMSs developed from the theoretical work of Dietl et al, who produced a material with ferromagnetic behavior above room temperature using ZnO doped with 0.05 mol of Mn 2+ with electrons or hole concentrations (3.5 × 10 20 cm –3 ). Dietl et al’s studies inspired numerous subsequent studies of ZnO to obtain DMSs for spintronic applications . ZnO is well known for unique characteristics like high electron mobility, a wide band gap of ∼3.4 eV even at room temperature, and good transparency.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Ferromagnetism in Mn-Doped ZnO Nanoparticles Synthesized by the Sol–Gel Method

et al. 2023

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In the current work, pure ZnO and Mn-doped ZnO nanoparticles were synthesized by the sol–gel autocombustion method. Structural analysis and phase determination were done by X-ray diffraction, and a hexagonal wurtzite structure was exhibited with disparate microstructures for all samples. Mn2+ ions were well composed, as evidenced by the fluctuation of lattice parameters, dislocation density, and lattice strain. Crystallite size decreases from 38.42 to 27.54 nm by increasing the doping concentration. Field emission scanning electron microscopy results shows the combination of evenly distributed spherical-like and hexagon-like structures. Fourier transform infrared spectra revealed that when Mn content increased, the absorption bands red-shifted. The drop in the energy band gap from 3.25 eV for ZnO to 2.99 eV for Zn0.96Mn0.04O was predicted by ultraviolet–visible absorption spectra. This red shift in the energy band gap can be explained by the sp–d exchange interaction between the band electrons of ZnO and localized d electrons of Mn. A study of magnetic properties revealed the change of the diamagnetic attribute for pure ZnO to the room-temperature ferromagnetic attribute of doped samples. In the current study, room-temperature ferromagnetism was achieved for Mn-doped ZnO nanoparticles, which can serve as a desirable option for practical applications in the future.

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Synthesis and structural, magnetic characterization of nanocrystalline Zn1−xMnxO diluted magnetic semiconductors (DMSs) synthesized by combustion reaction

Cited by 22 publications

References 10 publications

Effect of doping and sintering in structure and magnetic properties of the diluted magnetic semiconductor ZnO:Ni

Effect of doping and sintering in structure and magnetic properties of the diluted magnetic semiconductor ZnO:Ni

Phase evolution during conventional and reactive flash sintering of (Mg,Ni,Co,Cu,Zn)O via in situ X‐ray diffraction

Room-Temperature Ferromagnetism in Mn-Doped ZnO Nanoparticles Synthesized by the Sol–Gel Method

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