A study of dielectric behavior of manganese doped barium titanate–polyimide composites

Abstract In this work, a series of BaTi 1− x Mn x O 3 –polyimide films were prepared by simple solution casting method. For the preparation of composite films firstly, manganese doped barium titanate, BaTi 1− x Mn x O 3 (where x = 0.00, 0.01, 0.03, 0.05) was synthesized by sol‐gel process. The effect of Mn doping on its structural and dielectric properties was nicely explained. The highest dielectric constant value of 7,104 was obtained for BaTi 0.99 Mn 0.01 O 3 ( BTM n) nanoparticles with low dielectric loss value 2.44. It was observed that Mn‐doping concentration on barium titanate influences its crystal structure. Improved dielectric properties were reported for nanocomposite thin films containing BaTi 0.99 Mn 0.01 O 3 and polyimide ( PI ). A series of five homogeneous nanocomposite films were successfully prepared and were characterized thoroughly. The dielectric properties were studied as a function of frequency and loading percentage of BTM n in PI . The dielectric constant of the BTM n/ PI nanocomposite films increased from 3.23 to 8.63 with the increase in loading percentage of ceramic from 0 to 5 wt%, respectively. The nanocomposite films were flexible with good mechanical properties and the flexibility decreased with increase in loading percentage of BTM n. The films showed high thermal stability in nitrogen atmosphere up to 571°C with 10% weight loss and also exhibited high glass transition temperature up to 337°C.