Abstract This paper presents the results of laboratory research on influence heat treatment corrosion resistance austenitic steels (Cr-Ni, Cr, Mn, Cr-Mn-Ni), that may extend under certain conditions and ferrites semi-ferrites chrome steels.This type intercrystalline was observed in other alloy systems due to media containing chloride ions.The experimental consist comparing structural changes ra...

Computer-aided design (CAD) of ferrite microwave devices requires an accurate, yet simple mathematical model of the permeability of polycrystalline ferrites. Contrary to earlier mathematical models, the model described in the present paper takes account of the variation of dc moment with bias field, and incorporates the "low-field loss" observed in ferrites, when magnetized incompletely. Typica...

Ferrites have excellent magnetic, electric, and optical properties that make them an indispensable choice of material for a plethora applications, such as in various biomedical fields, magneto–optical displays, rechargeable lithium batteries, microwave devices, internet technology, transformer cores, humidity sensors, high-frequency media, magnetic recordings, solar energy fluids. Recently, mag...

Cu and Ni ferrites as the semiconductor materials were synthesized by a microwave sol-gel auto-combustion method. Two cationic surfactants, sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB), were applied and the influence of surfactants on the properties of the Cu and Ni ferrite particles was studied. The samples were characterized by X-ray powder diffraction (XRD) pattern,...

Nickel ferrites have been extensively studied due to their numerous applications in electronic devices, microwave adsorbents, corrosion protectors, magnetic fluids and catalysts [1-5], among others. Nickel ferrite is a soft material with inverted spinel with the tetrahedral site (A) occupied by Fe and the octahedral site occupied by Fe and Ni. It is applied to devices that require easy magnetiz...

The influence of various cations ranging from alkali metals to transition metals according to the periodic table were discussed. The ferrites used were Ni ferrite, Mg ferrite and Zn ferrite having different cation distributions in the spinel lattice. Cations having appropriate ionic radii and valencies are soluble in ferrite. Several additives formed other phase in addition to the spinel phase....

Mossbauer spectra of jacobsite have been recorded at temperatures of 4.2, 125, 180, 240 and 300 K and with an external magnetic field of 60 kOe applied parallel to the incident radiation at 4.2 K. The results show the presence of two different magnetic hyperfine interactions associated with the iron nuclei. Spectra of samples in external magnetic fields indicate the same sign for the magnetic h...

Co0.7Me0.3Fe2O4 (Me = Zn, Ni and Mn) were synthesized through co-precipitation method. Cationic distribution for these ferrites was proposed on the basis of magnetization measurements and available occupancy of the substituent ions into the spinel lattice. Theoretical lattice constant calculations confirm the proposed cationic distributions were the correct ones.

A study of the dependence of elastic behaviour of polycrystalline mixed Ni-Zn ferrites of different compositions on temperature and magnetic field (AE-effect) has been made using a ultrasonic method. The variation of Young's modulus with temperature follows Wachtman's equation. The dependence of the Young's modulus on magnetic field is explained using a theoretical model suggesteds by Lewis and...