Dielectric study on Zn1-xMgxO ceramic materials prepared by the solid-state route (Articolo in rivista)

Type
Label
  • Dielectric study on Zn1-xMgxO ceramic materials prepared by the solid-state route (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00339-014-8587-9 (literal)
Alternative label
  • Othman, Zayani Jaafar; Matoussi, Adel; Rossi, Francesca; Salviati, Giancarlo (2014)
    Dielectric study on Zn1-xMgxO ceramic materials prepared by the solid-state route
    in Applied physics. A, Materials science & processing (Print); Springer, Berlin Heidelberg (Germania)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Othman, Zayani Jaafar; Matoussi, Adel; Rossi, Francesca; Salviati, Giancarlo (literal)
Pagina inizio
  • 1515 (literal)
Pagina fine
  • 1524 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 117 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Sfax; IMEM-CNR (literal)
Titolo
  • Dielectric study on Zn1-xMgxO ceramic materials prepared by the solid-state route (literal)
Abstract
  • The present work investigates the structural and dielectric properties of Zn1-xMgxO composites prepared by the standard sintering method at 1200 degrees C during 24 h and doped with different weight percentages of MgO (x = 0-40 %). For this purpose, the scanning electron microscopy (SEM) was used to study the effect of the magnesium's proportion on the morphology and crystallinity of the obtained samples. The SEM observations have shown rougher surfaces of the samples covered by grains having prismatic shapes and different sizes. The dielectric properties of the ceramics were investigated by spectroscopic impedance at different temperatures and frequencies, thus showing a frequency-dependent dispersion of the permittivity constants and dielectric losses. From these measurements, the relaxation processes were identified and their activation energies extracted. Dielectric responses were correlated with the microstructure and chemical composition of the ZnMgO composites. The mechanisms of ac conductivity are controlled by the polaron hopping and the electron tunneling models. Concerning the tunneling model, two types corresponding to the overlapping large polaron tunneling model for the composites Zn0.9Mg0.1O and Zn0.8Mg0.2O and the small polaron tunneling model for the composites Zn0.64Mg0.36O (in the frequency range 1.7 x 10(4) Hz-1 MHz) and Zn0.6Mg0.4O were observed. Besides, one type of hopping model corresponding to the correlated barrier hopping for the composites ZnO and Zn0.64Mg0.36O (in the frequency range 6 x 10(2)-1.7 x 10(4) Hz) was noted. (literal)
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