Аннотация
This paper reports on the synthesis (chemical co-precipitation reaction)
and characterization (X-ray diffraction, magnetization, and electron
paramagnetic resonance) of nanosized Cd1-xMnxS particles with manganese concentration up to x = 0.73. Though the literature reports that
nanosized (bulk) CdS can incorporate as much as 30% (50%) of manganese
ion within its crystal structure we found manganese segregation at the
nanoparticle surface at doping levels as low as 14%. We found that both
XRD and magnetization data support the presence of the Mn3O4 phase
(observed spin-glass transition around 43 K) at the high manganese
doping levels whereas the EPR data strongly suggest preferential
incorporation of manganese at the nanoparticle's surface, even at low
manganese doping levels. Analyses of the experimental data strongly
suggest the preparation of well-defined core/shell (Cd1-xMnxS/Mn3O4)
structures at higher levels of manganese doping.
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