<abstract xmlns="http://www.w3.org/1999/xhtml">Polycrystalline Cr substituted Ni ferrites [NiCrxFe2−xO4 (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 Nelson-Riley 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.</abstract>

Polycrystalline Cr substituted Ni ferrites [NiCrxFe2−xO4 (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 Nelson-Riley 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.

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

Department of Physics, Chittagong University of Engineering and Technology, Chittagong-4349,

Nuclear Safety, Security & Safeguards Division, Bangladesh Atomic Energy Commission, Dhaka,

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Polycrystalline Cr substituted Ni ferrites [NiCrxFe2−xO4 (0.0 ≤ x ≤ 1.0)] were synthesized by conventional ceramic method and sintered at 1350 °C in air. X-ray...

Concentration	Lattice parameter	X-ray density	Bulk density	Porosity	Activation energy
x	a [ Å]	ρ_x [g/cm³]	ρ_b [g/cm³]	P [%]	E_f	E_p	ΔE = E_p − E_f
0.0	8.339	5.452	4.515	17.20	0.14	1.74	1.60
0.2	8.332	5.445	4.577	15.94	0.13	2.31	2.18
0.4	8.321	5.445	4.398	19.23	0.10	1.94	1.84
0.6	8.320	5.425	4.272	21.26	0.34	0.96	0.62
0.8	8.317	5.410	4.284	20.81	0.40	1.03	0.63
1.0	8.309	5.404	4.090	24.32	0.36	1.19	0.83

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

Article Category: Research Article

Publicado en línea: 27 abr 2016

Páginas: 185 - 191

Recibido: 02 dic 2015

Aceptado: 05 ene 2016

DOI: https://doi.org/10.1515/msp-2016-0028

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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Lattice parameter, X-ray density, bulk density, porosity and activation energy for NiCrxFe2−xO4 sintered at 1350°C.