Y3+ substituting-adjusted mechanical, dielectric, and impedance properties of cobalt copper zinc nanoferrites for high frequency applications

Abstract

Upgrading mechanical-dielectric features of ferrites through rare-earth yttrium (Y3+) doping provides feasibility to evolving high-frequency electronic devices. This paper reports the mechanical and dielectric properties of Co0.5Cu0.25Zn0.25YxFe2–xO4 ferrite nanoparticles labeled as CCZYF#0, CCZYF#1, CCZYF#2, CCZYF#3, CCZYF#4 and CCZYF#5 for x = 0.0, 0.02, 0.04, 0.06, 0.08, and 0.1, respectively. The frequency and temperature dependence of dielectric parameters and conductivity of all CCZYF nanoferrites are well discussed. The nanoferrite CCZYF#5 has the highest dielectric constant (enhancing ratio 170%) and the highest conductivity (enhancing ratio 7125.81%) compared with the undoped sample. Nyquist plots of all CCZYF nanoferrites manifest two arcs; the main reasons for the dielectric process are the grain boundaries and bulk grains. All impedance parameters were determined, which showed the effective role of Y3+ ions on their values. The nanoferrite CCZYF#5 has the highest grain boundaries capacitance (with enhancing ratio of 59.40%) and the highest grains capacitance (with enhancing ratio of 22.53%) with a relaxation time decrement efficiency of 62.51%. An ultrasonic flaw detector was utilized to determine the elastic moduli of all CCZYF nanoferrites. The nanoferrite CCZYF#5 has the highest longitudinal modulus (with enhancing ratio of 20.95%), the highest shear modulus (with enhancing ratio of 48.72%), highest Young's modulus (with enhancing ratio of 88.47%), the highest bulk modulus (with enhancing ratio 13.27%) and the highest micro hardness (with enhancing ratio 77.77%). Hence, Y3+ tuned Co-Cu-Zn nanoferrites possess new opportunities for high-frequency and storage applications.