Effect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties of ZnO nanoparticles

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dc.creatorFranco Júnior, Adolfo
dc.creatorPessoni, Hermínia Veridiana dos Santos
dc.date.accessioned2023-11-09T12:21:00Z
dc.date.available2023-11-09T12:21:00Z
dc.date.issued2017
dc.description.abstractNanostructured Zn Gd O 1−x x δ (0 ≤ ⩽ 0.0 x 2) powders were synthesized by the combustion reaction method (CR) with the purpose to investigate the effect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties at room temperature. The structure and morphology of all samples were characterized by X-ray diffraction (XRD), and transmission electron microscope (TEM). The XRD patterns of all samples exhibited sharp and intensive peaks of hexagonal wurtzite structure of ZnO without any evidence of spurious crystalline phases. The nanoparticles crystalized in roughly spherical morphology with bimodal particle size distribution centered at ∼30, ∼100 and ∼70, ∼160 nm for undoped and Gd – doped ZnO (x=0.02), respectively. Diffuse reflectance spectrum of each sample was obtained by using a UV/VIS/Near spectrometer and the optical band-gap, Eg, values decreased with increasing Gd doping concentration; being ∼3.23, and ∼3.17 eV for x=0 and 0.02, respectively at room temperature. This red shift on the band-gap was discussed in terms of new band levels below the conducting band. Also, the dielectric permittivity data of all samples could be evaluated by the Cole– Cole model. Seems that both oxygen vacancies (VO) or/and interstitial oxygen (O″¨ı) defects present in the Gd – doped ZnO samples play an important rule in the dielectric permittivity at room temperature. Furthermore, all Gd – doped ZnO samples exhibited typical paramagnetic behavior at rom temperature
dc.identifier.citationFRANCO JR, A.; PESSONI, H. V. S. Effect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties of ZnO nanoparticles. Physica B: condensed matter, Amsterdam, v. 506, p. 145-151, 2017. DOI: 10.1016/j.physb.2016.11.011. Disponível em: https://www.sciencedirect.com/science/article/pii/S0921452616305373. Acesso em: 4 set. 2023.
dc.identifier.doi10.1016/j.physb.2016.11.011
dc.identifier.issn0921-4526
dc.identifier.issne- 1873-2135
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0921452616305373
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectZinc oxide
dc.subjectGd-doped ZnO
dc.subjectDMS
dc.subjectRoom temperature ferromagnetism
dc.subjectCombustion reaction method
dc.titleEffect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties of ZnO nanoparticles
dc.typeArtigo

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