Temperature Dependence on Dielectric Properties of PMMA with Al₂O₃ Composite Polymer Film

The dielectric permittivity as function temperature in the range of 40 to 120 °C for the polymer film of PMMA and its composite film of PMMA with Al₂O₃ at 10 weight percent is studied at different frequency. The ac conductivity of PMMA film and its composite Al₂O₃ polymer film shows that increases the temperature and frequency the ac conductivity increases anomaly at lower temperatures becomes more obvious with increasing the frequency and in composite film the Al₂O₃ doping content, which probably corresponds to a transition from ferroelectric to anti-ferroelectric phases. The film is characterized by using X-ray diffractometer and it is confirmed that the structure of the composite film is in hexagonal. The appearance of sharp peaks indicates that sample posses’ micro Al₂O₃ crystal structure of Aluminum oxide.