Author/Authors :
M. V. Nikolic´، نويسنده , , N. Obradovic´، نويسنده , , K. M. Paraskevopoulos ، نويسنده , , T. T. Zorba، نويسنده , ,
S. M. Savic´، نويسنده , , M. M. Ristic، نويسنده ,
Abstract :
Zinc-titanate ceramics were obtained by initial
mechanical activation in a high-energy planetary mill for
15 min followed by sintering at temperatures 900–1100 C
for 2 h. Room temperature far infrared reflectivity spectra
for all samples were measured in the range 100–
1200 cm-1. The same ionic oscillators were present in the
measured spectra, but their intensities increased with the
sintering temperature in correlation with the increase in
sample density and microstructure changes. Optical
parameters were determined for seven oscillators belonging
to the spinel structure using the four-parameter model
of coupled oscillators. Born effective charges were calculated
from the transversal/longitudinal splitting
