The Effect of x Mole Ratio on Crystal Structure and Characteristic of Microwave Absorption of ZnLa_xFe_(2-x)O₄System

Abstract

The effect of x mole ratio on crystal structure and characteristic of microwave absorption of ZnLaxFe(2-x)O4 system (x = 0.0; 0.01and 0.02) synthesized by solid state reaction method has been studied. The series of ZnLaxFe(2-x)O4 samples were prepared using ZnO (99.99%) and Fe2O3 (99.99 %) powders (Merck product), while La2O3 (local production) powders in mole ratio. The identification result of the XRD shows that all of samples are single phase in this stage, it has cubic spinel structure with space group F d-3 m. The SEM image of ZnLaxFe(2-x)O4 samples appear that the increase of mole ratio, the particle size of the compound powder rapidly becomes bigger, homogeneous and not uniform powder with spherical in shape and particle size of 200-500 nm. The results of the VNA characterization shows that the increasing of mole ratio (x = 0.0; 0.01 and 0.02) will enhance the ability to absorb microwave from 90.35% upto 97.69%. Thus. the composition of x=0.02 (ZnLa0.02Fe1.98O4) possess to be the best composition for microwave absorbing material.

Enhanced Magnetic and Microwave Absorbing Properties of Nd3+ Ion Doped CoFe2O4 by Solid‐State Reaction Method

“…This reflection loss in the spinel ferrite system naturally arises from the coupling interaction between electrons from Nd 3þ ions and Fe 3þ ions that are unpaired in the 3d-4f configuration that, changes their magnetic properties. [49,50] It also affects the impedance matching ratio and the ability of the material to attenuate the microwave of the Nd 3þ ions doped samples. Another parameter, such as the geometrical factor arising from the different particle sizes, is important in tuning the microwave absorbing characteristic.…”