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Nature friendly and environmentally safe BaZr 0.2 Ti 0.8 O 3  is synthesized by double sintering technique using microwave furnace. X-ray diffraction and SEM revealed cubic structure and spherical agglomerated grains respectively. A large dielectric constant of 12500 at 1 MHz and a phase transition at 31 °C is noticed. Optical characterization using UV-Vis spectrometer affirmed 3.16 eV band gap and a transparent window between infrared and far-infrared region, which can be tapped for optoelectronic applications. Performance of refractive index, extinction coefficient and optical conductivity behavior at optical frequencies are in accordance with dielectric behavior.

Microwave sintered lead-free ferroelectrics with colossal dielectric constant at optical frequency