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11-03-2019 | Issue 8/2019

Journal of Materials Science: Materials in Electronics 8/2019

Giant anomalous dielectric behaviour of BaSnO3 at high temperature

Journal:
Journal of Materials Science: Materials in Electronics > Issue 8/2019
Authors:
Ku Noor Dhaniah Ku Muhsen, Rozana Aina Maulat Osman, Mohd Sobri Idris
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Abstract

BaSnO3 ceramic was synthesized by conventional solid state route at high sintering temperature 1450 °C which leading to oxygen loss in air. X-ray diffraction (XRD) analysis has confirmed the phase purity of BaSnO3 with cubic structure and space group Pm-3m. The unexpected giant anomalous dielectric properties of pure BaSnO3 ceramic was revealed by impedance spectroscopy analysis when the dielectric constant (εr) value rapidly increased by temperature and gives the highest εr peak at 220 °C with 87,290 and 6027 measured at 10 Hz and 1 kHz respectively. Then, it decreases gradually by increasing the temperature above 220 °C. This anomalous giant εr was observed during heating impedance measurement and disappear upon cooling. The anomalous behaviour is expected due to oxygen deficiency.

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