Dielectric properties of metallic alloy FeCoZr-dielectric ceramic PZT nanostructures prepared by ion sputtering in vacuum conditions

2018 5th Global Conference on Polymer and Composite Materials

材料科学;化学

Boiko, O.^1

Electrical Engineering and Computer Science Faculty, Lublin University of Technology, 38A Nadbystrzycka Street, Lublin

20-618, Poland^1

关键词: Dielectric loss factors;    Electrical conduction;    Electrical parameter;    Frequency dependencies;    Hopping conductivity;    Impedance spectroscopy;    Isochronous annealing;    Percolation thresholds;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/369/1/012016/pdf
DOI  :  10.1088/1757-899X/369/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The main objective of the research was investigation of dielectric properties of (FeCoZr)x(PZT)(100-x)granular nanocomposites and determination the influence of isochronous annealing in temperatures of 398 K-573 K on them. The impedance spectroscopy methodology was used. The measurements of electrical parameters, such as: phase shift angle dielectric loss factor tgδ, capacity C and conductivity σ of (FeCoZr)x(PZT)(100-x)nanocomposites have been performed. Frequency dependencies of these parameters were obtained for the ambient temperature range 98 K-373 K for the frequencies ranging from 50 Hz to 105Hz. It was established, that the conductivity σ of the tested materials before the percolation threshold demonstrates non-linear dependence on frequency. Furthermore, it increases when the ambient temperature is increasing, which indicates a dielectric type of the material. The two types of electrical conduction: capacitive (phase shift angle takes negative values) and inductive (takes positive values) have been observed. It was concluded that the hopping conductivity dominated in the nanocomposites. Voltage and current resonances phenomena are observed in the materials. The isochronous annealing intensifies the dielectric properties of (FeCoZr)x(PZT)(100-x)nanocomposites.