Synthesis and structural, magnetic characterization of nanocrystalline Zn1-xCoxO diluted magnetic semiconductors (DMS) 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.2017.11.213

Cited by 22 publications

(9 citation statements)

References 14 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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“…With the development of spintronics, diluted magnetic semiconductors (DMSs), as the main research materials, have been extensively explored. DMSs have excellent magnetic, magneto-optic and magnetoelectronic properties, and have important applications in high-density nonvolatile memory, magnetic inductors, optical isolators, semiconductor integrated circuits, semiconductor lasers and spin quantum computers [1]. Zinc oxide is a multifunctional broadband semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Magnetic Properties of Fe Doped Zno Thin Films with Dilute Magnetic Semiconductors

Zhang¹,

Liu²,

Yuanhao³

2019

Int J Nanoparticles Nanotech

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Fe doped ZnO solid solution and its semiconductor thin films were prepared by sol-gel method. After aging and quenching, the films were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The elemental proportion was obtained by energy dispersive spectrometer (EDS) and the magnetic properties were measured by magnetic force microscope (MFM). The results show that iron doping can inhibit the growth of zinc oxide particles, and then increase the roughness of thin films. The results of MFM show that Fe doping can make non-magnetic ZnO semiconductors become dilute magnetic semiconductors. With the increasing amount of Fe doping, the distribution of magnetic domains and magnetic moments becomes more obvious.

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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%

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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Synthesis and structural, magnetic characterization of nanocrystalline Zn1-xCoxO diluted magnetic semiconductors (DMS) synthesized by combustion reaction

Cited by 22 publications

References 14 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

Preparation and Magnetic Properties of Fe Doped Zno Thin Films with Dilute Magnetic Semiconductors

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

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