IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Dopants Incorporation in ZnO Mechanical Milled Powders Sensed By Positrons
Autor/es:
L. C. DAMONTE; V.DONDERIS; J.OROZCO; M.A.HERNÁNDEZ-FENOLLOSA
Lugar:
Foz de Iguazú, Brasil
Reunión:
Conferencia; XIV International Conference on Hyperfine Interactions (HFI+NQI 2007),; 2007
Institución organizadora:
UNLP-CBPF-
Resumen:
Structural and optical characterization of M-doped ZnO (M: Cd, Mg) powders obtained
by mechanical milling are present. The starting materials were commercially ZnO,
MgO and CdO powders at different concentrations. The samples were prepared by mechanical
milling in a Restch MM 2 horizontal oscillatory ball mill. The milled powders were
analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), positron lifetime
annihilation spectroscopy (PALS) and photoluminescence spectroscopy (PL). The
mixing of the oxides is followed by means of XRD and SEM. As milling proceeds a clear
reduction of grain size and homogenization are observed. The evolution of annihilation
parameters and PL spectra with milling time and cation content were analyzed and related
with the kind of mechanical induced defect involved. Ternary oxides Zn1−xMxO
were efficiency obtained for certain compositions. Different positron traps, as vacancies,
interstitials, vacancy clusters were identified during milling evolution. The results showed
that positrons constitute a well suited probe to characterize the cation substitution in
the ZnO oxide lattice.
were efficiency obtained for certain compositions. Different positron traps, as vacancies,
interstitials, vacancy clusters were identified during milling evolution. The results showed
that positrons constitute a well suited probe to characterize the cation substitution in
the ZnO oxide lattice.
1−xMxO
were efficiency obtained for certain compositions. Different positron traps, as vacancies,
interstitials, vacancy clusters were identified during milling evolution. The results showed
that positrons constitute a well suited probe to characterize the cation substitution in
the ZnO oxide lattice.