Dielectric properties of electron irradiated PbZrO3 thin films

Bulletin of materials science

Ganesh Sanjeev¹  S B Krupanidhi²  V M Jali³  Jayanta Parui²  Shetty Aparna³ 

[1] Microtron Centre, Mangalore University, Mangalore 574 199, India$$Microtron Centre, Mangalore University, Mangalore 574 199, IndiaMicrotron Centre, Mangalore University, Mangalore 574 199, India$$;Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Materials Research Centre, Indian Institute of Science, Bangalore 560 012, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$;Department of Physics, Gulbarga University, Gulbarga 585 106, India$$Department of Physics, Gulbarga University, Gulbarga 585 106, IndiaDepartment of Physics, Gulbarga University, Gulbarga 585 106, India$$

关键词: PbZrO3;    antiferroelectrics;    irradiation effects.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The present paper deals with the study of the effects of electron (8 MeV) irradiation on the dielectric and ferroelectric properties of PbZrO₃ thin films grown by solâ€�?�gel technique. The films were (0.62 𝜇m thick) subjected to electron irradiation using Microtron accelerator (delivered dose 80, 100, 120 kGy). The films were well crystallized prior to and after electron irradiation. However, local amorphization was observed after irradiation. There is an appreciable change in the dielectric constant after irradiation with different delivered doses. The dielectric loss showed significant frequency dispersion for both unirradiated and electron irradiated films. ð‘�??_c was found to shift towards higher temperature with increasing delivered dose. The effect of radiation induced increase of 𝜀′(ð‘�??) is related to an internal bias field, which is caused by radiation induced charges trapped at grain boundaries. The double butterfly loop is retained even after electron irradiation to the different delivered doses. The broader hysteresis loop seems to be related to radiation induced charges causing an enhanced space charge polarization. Radiation-induced oxygen vacancies do not change the general shape of the AFE hysteresis loop but they increase ð‘�?_s of the hysteresis at the electric field forced AFE to FE phase transition. We attribute the changes in the dielectric properties to the structural defects such as oxygen vacancies and radiation induced charges. The shift in ð‘�??_c, increase in dielectric constant, broader hysteresis loop, and increase in ð‘�?_r can be related to radiation induced charges causing space charge polarization. Double butterfly and hysteresis loops were retained indicative of AFE nature of the films.

【 授权许可】

Unknown