Far infrared reflectance of sintered Zn2TiO4
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.
The authors would like to express their gratitude to Dr. M. Mitric for X-ray measurements. This work was partially financed by the Ministry for Science of the Republic of Serbia through project 142011G and F 7/2 financed by the Serbian Academy of Sciences and Arts.
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