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The influence of niobia addition on the phase formation and dielectric properties of Pb(Zr 0.45 Ti 0.55 )O 3 powder prepared from polymeric precursor was analyzed. The weight fraction and unit-cell volume of the tetragonal phase decreased, and the mass fraction of the rhombohedral phase increased, with increasing niobia concentration. The rhombohedral...
Electron Paramagnetic Resonance (EPR) spectra have been obtained at room temperature and at X-band in powders of SnO 2 doped with Mn from 0.3 to 10% and submitted to heat treatment from 500 to 900 o C. Mn ions are probably located at particle surfaces as Mn 2+ , evidenced by its single EPR line which narrows by the exchange interaction effect due to particle growth observed...
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