Room-temperature ferromagnetism in Co-, Cr-, and V-doped ZnO diluted magnetic semiconductor

Ahmed, Sohail

doi:10.1007/s00339-017-1058-3

Cited by 22 publications

(5 citation statements)

References 54 publications

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“…The oxygen positional parameter (u) calculated for Mn0, Mn1, and Mn5 samples are 0.38016, 0.38006, and 0.38004, respectively. It is worth mentioning that in a stoichiometric wurtzite structure, the c/a ratio is 1.633 [40]. All samples showed a significantly smaller c/a ratio and this might indicate the presence of oxygen vacancies V O and extended defects.…”

Section: Resultsmentioning

confidence: 93%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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Zn1−xMnxO (x = 0.00, 0.01, and 0.05, respectively) was synthesized by using solid state reaction method. The structural properties were characterized by using X-ray diffraction and scanning electron microscopy. Optical properties were investigated by UV-visible spectroscopy. X-ray diffraction patterns indicate that all samples have hexagonal wurtzite structure without any impurity phases. The diffraction intensity increases and the peak position shifts to a lower 2θ angle with Mn concentration. The lattice parameters a and c, the volume of unit cell increase with Mn content indicating that Mn 2+ ions go to Zn 2+ ions in ZnO lattice. The grain size increases with Mn doping while the microstrain and dislocation density decrease. UV-vis spectra of the samples show that undoped ZnO sample has an energy band gap Eg of 3.34 eV. The optical study indicates a red shift in the absorbance spectra and a decrease in the band gap Eg with Mn content. This decrease of band gap may be attributed to the influence of dopant ions. The morphology and grain distribution of ZnO samples were analysed by scanning electron microscopy. The particle sizes are higher in doped samples when compared to the undoped sample and the surface roughness increases with Mn content. The grains are closely, densely packed and pores/voids between the grains increase with Mn content.

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Section: Resultsmentioning

confidence: 93%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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“…It belongs to the space group C 6v or P6 3 mc. , Its crystal structure does not show any alteration when doped with transition metals which shows perfect integration of transition metals into the ZnO crystal lattice. However, the lattice parameters and unit cell volume increases on doping with transition metals having ionic radii of a +2 state and greater than 0.60 Å which is the tetrahedral ionic radius of Zn 2+ . , Ji et al have found a slow variation in lattice parameter (decrease in c ) because of a very small difference in the tetragonal ionic radius of Co 2+ (0.58 Å) and Zn 2+ (0.6 Å). The grain size reduces with an increase in doping concentration because of a decrease in nucleation and growth.…”

Section: Structure Of Transition Metal (Tm)-doped Znomentioning

confidence: 99%

Progress on Transition Metal-Doped ZnO Nanoparticles and Its Application

Singh

Kumar

Singh

2019

Ind. Eng. Chem. Res.

177

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ZnO nanoparticles are still a hot area for research even after ample work has been done by researchers across the world. It is a versatile material for doping of different transition metals among other metal oxides. Having a large family of morphological structures, high electron mobility, and n-type carrier defects, it is suitable for a number of applications such as memory devices, spintronics, optoelectronic devices, solar cells, and sensors. Here, we have emphasized a review of the effects of transition metal (TM) doping on the different physical properties of ZnO nanoparticles and their applications. We have gone through some theoretical models which were used by most of the researchers for explaining the variations in physical properties. Explanation of the sensing, photocatalytic, and optoelectronic processes in different classes of devices is briefly described. Lastly, the comparative studies of different devices are also made available for clear understanding.

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“…Subsequently, the effect of single concentration (0.01 mol%) of vanadium dopant was investigated on the morphological study of ZnS/CdS composite nanopowder. Transition metal (TM) at a small concentration does not seem to produce noticeable distortions in the structure [40]. The unit cell parameters slightly change with dopant content which shows effectively built into the host lattice due to this there is no secondary diffraction peaks from other crystalline forms are noticed [41].…”

Section: Introductionmentioning

confidence: 99%

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

Madhavi

2019

SN Appl. Sci.

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The paper deals with the exhaustive study and analysis of VO 2+ ions doped ZnS/CdS composite nanopowder with the help of X-ray peak profile analysis (XPPA). The investigation has been carried out by applying a distinct pattern of Williamson-Hall (W-H) approach viz., uniform deformation model, the uniform stress deformation model and uniform deformation energy density model, and size strain plot (SSP). Fourier transforms infrared spectroscopy (FT-IR), scanning electron microscope and energy dispersive spectra (EDS) and transmission electron microscope (TEM) techniques. The XRD study is high manipulated order and fundamental focus is on phase identification, with some analysis on advanced concepts such as crystallite size and lattice strain have been estimated using the modified form of the W-H methods. XRD pattern confirmed that the structure of the sample belongs to the cubic system. The variation of lattice constant (a) with dopant is assigned to Vegard's law. The root means square strain was identified from the interionic separation and lattice strain assumed on W-H models. FT-IR spectrum exhibited characteristic vibrational modes of Zn and Cd ions along with other bands. EDS analysis gives information about the elemental composition in the present sample. The shape of VO 2+ ions doped ZnS/CdS composite nanopowder was spherical in TEM images. The result showed that there was a good agreement in the particle size obtained from the W-H method and the SSP method with TEM images.

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Room-temperature ferromagnetism in Co-, Cr-, and V-doped ZnO diluted magnetic semiconductor

Cited by 22 publications

References 54 publications

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Progress on Transition Metal-Doped ZnO Nanoparticles and Its Application

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

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