Open AccessDc electric conduction mechanisms and high frequency dielectric properties of different magnetoelectric composites
Author(s) -
M. A. Ashmawy,
A. A. Sattar,
Hamed Elsayed,
M. M. Rashad
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1253/1/012016
Subject(s) - materials science , dielectric , composite material , microstructure , curie temperature , electrical resistivity and conductivity , composite number , ferrite (magnet) , dielectric loss , thermal conduction , permittivity , tetragonal crystal system , ferrimagnetism , condensed matter physics , magnetization , phase (matter) , ferromagnetism , chemistry , magnetic field , electrical engineering , physics , optoelectronics , engineering , organic chemistry , quantum mechanics
Various dc conduction mechanisms and high frequency (1MHz up to 3 GHz) dielectric properties have been studied for the particulate and 0-3 core shell composites. X -ray diffraction has been used to identify the structural properties. Tetragonal and cubic structures for PZT and ferrite respectively were appeared either in the pure form or in composites form. The microstructures have been investigated by TEM and particle size distribution was calculated. The microstructure plays a significant role in the electric properties. Dc resistivity vs. temperature measurements were implemented by using ‘two probe’ method. The room temperature resistivity was large in core shell in comparison with composite due to the unique microstructure of the core shell that enhances the interfacial disability of motion of carriers and increasing the carriers hopping path. Moreover, dc electric conduction mechanisms for all investigated samples have been determined. Curie temperatures for ferrimagnetic and ferroelectric phases were the transition points between the conduction mechanisms. Curie temperature of ferrites remarkably increased in the C.S. and composite. Finally, Dielectric and ac resistivity measurements were measured at room temperature. The dielectric constant (ε’) was enlarged in the core shell rather composite while the tangent loss was reduced. These appreciable enhancements could be useful in the high frequency applications.