Shielding performance of MnxNi0.8-xZn0.2Fe2O4 (0.1 & LE;x & LE;0.7) for electromagnetic interference (EMI) in X-band frequency

A series of MnxNi0.8-xZn0.2Fe2O4 (0.1 & LE;x & LE;0.7) nanoferrites were prepared by sol-gel auto combustion method. The TGA-DSC studies revealed the weight loss up to 700?degrees C and after no weight loss was found confirming the complete ferrite phase. Therefore, the as-burnt samples subjected to conventional sintering at 900 degrees C for 2h. The traces of XRD patterns revealed that formation of ferrite phase co-existed with secondary phases. The complex permittivity and permeability of present ferrite systems are found to be dependent of Mn2+ ion concentration. The real part of dielectric constant (e & PRIME;) for the all compositions are in the range of 5.184-6.951 at 8.2 GHz while it is 5.269-7.663 at 12.4 GHz. The values of e & PRIME; at 8.2 GHz are slightly lower than the values at 12.4 GHz. The imaginary part of dielectric constant (e & PRIME;& PRIME;) was found to be in the range of 0.046-0.315 for all compositions over the entire range of X-band frequency (8.2-12.4 GHz). Compared to the variation of e & PRIME; , the variation of e & PRIME;& PRIME; is more disorder. The number of semicircles in Cole-Cole plots is a witness of multiple di-electric relaxations of EM energy dissipation. The real part of magnetic permeability (/4 & PRIME;) is increasing, while imaginary part of magnetic permeability (/4 & PRIME;& PRIME; ) is decreasing for all compositions as frequency is increasing from 8.2 to 12.4 GHz. Compared to the other ferrite compositions, the ferrite with low content of Mn2+ i.e. Mn(0.1)Ni(0.7)Zn(0.2)Fe(2)O(4 & nbsp;)ferrite system has higher value of /4 & PRIME;& PRIME; and seems to be invariant over the entire X-band frequency range. The total effective shielding (SET) for all compositions is found to be in the range 37-12 dB. The highest values of SET 37 dB at 8.2 GHz and 28 dB at 12.4 GHz were reported for the ferrite composition Mn0.1Ni0.7Zn0.2Fe2O4. The shielding studies revealed that Mn-Ni-Zn ferrite systems are effectively suppressing electromagnetic interference (EMI) in X-band frequency. Comparatively, the ferrite system Mn0.1Ni0.7Zn0.2Fe2O4 is useful for the fabrication of EMI suppressor.