Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Abstract

In this study, the role of Mn-substitution on the structural, morphological, dielectric, and magnetic properties of Al-doped ZnO nanoparticles has been examined, using XRD, FE-SEM, µAutolab/FRA2 impedance spectroscopy, and vibrating sample magnetometer (VSM) techniques. Structural investigations revealed diffraction peaks consistent with JCPDS card No. 036-1451. Morphological evaluations of the synthesized nanoparticles indicated that the shape of the nanoparticles is a slightly hexagonal and generally spherical structure with a size range of approximately 10-70 nm. Dielectric measurements were performed in frequency ranges between 10 −3 Hz and 1 MHz. The results show that the sample's dielectric behavior is affected both by crystallite size and doping material type. In addition, it can be observed that the dielectric parameters exhibit extreme frequency dependence. Mn-substituted Al-doped ZnO is a suitable candidate for high-frequency applications due to its low dielectric loss at high frequencies. The AC conductivity of the Mn-substituted Al-doped ZnO sample increases with each frequency increment, and its value is higher than for the Al-doped ZnO sample, makings it a desirable material for use in device applications. Magnetic calculations, extracted from dielectric impedance spectroscopy measurements, are also investigated. Complex magnetic permeability, together with magnetic loss curves, are also plotted. Finallly, a study of the magnetic properties of the sample, using VSM, showed room-temperature ferromagnetic behavior.

Accelerated Decoloration of Organic Dyes from Wastewater Using Ternary Metal/g-C3N4/ZnO Nanocomposites: An Investigation of Impact of g-C3N4 Concentration and Ni and Mn Doping

“…The g-C3N4 XRD pattern contained two distinct peaks at 13.02° and 27.3°, which correspond to the (100) and (002) facets of the crystals and confirmed its nanosheet morphology (JCPDS # 00-087-1526) [50,51]. The principal peaks ((100), (002), and (101)) in the XRD patterns of the Ni/GZ and Mn/GZ composites showed a minor decrease in intensity, supporting the successful incorporation of Ni/Mn metal ions into ZnO and its heterostructure development with g-C3N4 (Figure 3b) [52,53]. The successful synthesis of Ni/GZ and…”

“…X-ray diffractograms were used to characterize the phase and purity of the synthesized samples, as exhibited in Figure 3a 002) facets of the crystals and confirmed its nanosheet morphology (JCPDS # 00-087-1526) [50,51]. The principal peaks ((100), (002), and (101)) in the XRD patterns of the Ni/GZ and Mn/GZ composites showed a minor decrease in intensity, supporting the successful incorporation of Ni/Mn metal ions into ZnO and its heterostructure development with g-C 3 N 4 (Figure 3b) [52,53]. The successful synthesis of Ni/GZ and Mn/GZ composites is supported by the existence of characteristic g-C 3 N 4 and ZnO diffraction peaks in the XRD patterns [17].…”

Synthesis and Antioxidant Investigation of Ag₂S Nanoparticles Obtained from Silver(I) Complex of <i>N</i>-Methyl<i>-N</i>-Phenyl- Dithiocarbamate

“…The crystallite size of the nanoparticles was estimated by using Debye-Scherrer's equation (Eq. 2) [38]:…”