Structural and electrical properties of chromium substituted nickel ferrite by conventional ceramic method

Abstract

Polycrystalline Cr substituted Ni ferrites [NiCr x Fe 2−x O 4 (0.0 x 1.0)] were synthesized by conventional ceramic method and sintered at 1350°C in air. X-ray diffraction (XRD) patterns showing sharp peaks confirmed the formation of single phase cubic spinel structure. The lattice parameters of the samples were determined from the XRD data using NelsonRiley extrapolation technique. They were found to decrease with increasing Cr concentration obeying Vegard's law. X-ray density, bulk density and porosity were also calculated from the XRD data. The variation of DC resistivity with temperature was measured by two-probe method. The DC resistivity was found to decrease with increasing temperature indicating the semiconducting nature of the samples. Activation energy was calculated from the Arrhenius plot. AC resistivity, dielectric constant and loss tangent were measured in the frequency range of 1 kHz to 120 MHz at room temperature.

Magnetic and Photocatalytic Properties of Nanodispersed Ferrites Co$_x$Ni$_y$Zn$_{1-x-y}$Fe$_2$O$_4$

“…Як вихідну сировину використовують відповідні оксиди, солі, оксигідроксиди, карбонати, оксалати, цитрати [4][5][6][7]. Такі технології синтезу вимагають, зазвичай, використання високотемпературної обробки і складного апаратурного забезпечення [8,9]. Наприклад, під час синтезу фериту Ніколу, Кобальту і Цинку використовують метод автоматичного спалювання золь-гелю, спільного осадження, кульового помелу, зворотних міцел, емульсійний метод та ін.…”

Adsorption and gas sensing properties of CuFe2O4 nanoparticles

“…[1,2]. They exhibit semiconducting properties since they are metal-oxide materials [3]. Nanoparticles of ferrite have been employed recently for different applications including gas sensing [4][5][6][7].…”