Synthesis and Analysis of Para/Ferro-Electric Phase Shifter

Additive MnO2 mixing was tried with Barium strontium Titanate of various compositions through solid state reaction route. Calcinations carried out at 1100°C and sintering attempted at 1200°C. Compounds show remarkable dielectric and impedance behavior with flat dielectric constant and loss characteristics for three compositions. Modulus and conductivity analysis reveal change of conductivity from long to short range at certain temperature and low activation energy for high loss samples. Asymmetric natures confirm spreading of relaxation time and non Debye characteristics were demonstrated. Change of conductivity mechanism from correlated barrier hopping to non-overlapping small polar on tunneling was observed for higher additive MnO2 in Ba0.5Sr0.5TiO3.