The Effect of Nonstoichiometry on Microwave Absorbing Properties of Ni-Zn Ferrites

Abstract

Mcrowave ab601Joi ng pqmties of the mtoichi&c ampmds of Ni-Zn fesritt~ with excess F& are investigated Tmidal corrpacts of &ZmsO)1~(Fe2oj)~ spiws are msmd by the mvmtiional &c mccming techiqe ?he magwtic and dieldc constant are greatly depRtdent upcn the amxlnt of excess F a (y) 0). BcQh the real a d hgilliny mrponents of-bid@ decrease as the ewcess F a imeases On the other hand the dielecbic mtant inrreasg with the increase of exfess F & 'Re oombined effect of high diektric amstant and iow pmmbiity &ts in a l o w e r h n c y inpdam mtching. Tbe plate thickness at the m-reflectim fnqmy is predided using the m t d iwdam-matching relaticn&ip behYeen wavelength and rmterial pamr&m.

Microwave-absorbing properties of Ni0.50–xZn0.50−xMe2xFe2O4 (Me=Cu, Mn, Mg) ferrite–wax composite in X-band frequencies

“…Among the spinel ferrites, NiZn ferrites have been widely utilized as electromagnetic wave absorbing materials in the VHF/UHF region [8,9]. Nevertheless, the application of NiZn ferrites as RAM in X-band frequencies requires better performance.…”

Influence of microstructure on properties of Ni–Zn ferrite radio-absorbing materials

“…For absorption of electromagnetic waves at low frequencies -in a range from hundreds of kHz to hundreds of MHz -it is convenient to use radio-absorbing materials on the basis of ferrites, Ni-Zn ferrites in particular [2,4]. Ferrite radio-absorbing materials do not have the above-mentioned drawbacks: the thickness of a ferrite radio-absorbing material is about several millimeters; ferrites are noncombustible and are environmentally safe.…”