<abstract xmlns="http://www.w3.org/1999/xhtml">Nonstoichiometric series of Mg0.5−xCuxZn0.5Fe1.9O4−δ where x = 0.0, 0.1, 0.15, 0.2 and 0.25 has been synthesized by conventional solid state reaction route. The single phase spinel structure of the double sintered ferrites was confirmed by X-ray diffraction patterns (XRD). The ferrite series was studied in terms of DC electrical conductivity and thermoelectric power in the temperature ranging from room temperature to 300 °C and 400 °C, respectively. It was observed that DC electrical conductivity and Seebeck coefficient α decreased with the increase in x. DC electrical conductivity was found to decrease by about 4 orders. All the compositions showed a negative Seebeck coefficient exhibiting n-type semiconducting nature. From the above experimental results, activation energy and mobility of all the samples were estimated. Small polaron hopping conduction mechanism was suggested for the series of ferrites. Owing to their low conductivity the nonstoichiometric MgCuZn ferrites are the best materials for transformer core and high definition television deflection yokes.</abstract>

Nonstoichiometric series of Mg0.5−xCuxZn0.5Fe1.9O4−δ where x = 0.0, 0.1, 0.15, 0.2 and 0.25 has been synthesized by conventional solid state reaction route. The single phase spinel structure of the double sintered ferrites was confirmed by X-ray diffraction patterns (XRD). The ferrite series was studied in terms of DC electrical conductivity and thermoelectric power in the temperature ranging from room temperature to 300 °C and 400 °C, respectively. It was observed that DC electrical conductivity and Seebeck coefficient α decreased with the increase in x. DC electrical conductivity was found to decrease by about 4 orders. All the compositions showed a negative Seebeck coefficient exhibiting n-type semiconducting nature. From the above experimental results, activation energy and mobility of all the samples were estimated. Small polaron hopping conduction mechanism was suggested for the series of ferrites. Owing to their low conductivity the nonstoichiometric MgCuZn ferrites are the best materials for transformer core and high definition television deflection yokes.

DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

IFW, Leibniz Institute for Solid State and Materials Research

Department of Materials Science & Nanotechnology

Materials Science-Poland

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

{"article-title":"DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites"}

Nonstoichiometric series of Mg0.5−xCuxZn0.5Fe1.9O4−δ where x = 0.0, 0.1, 0.15, 0.2 and 0.25 has been synthesized by conventional solid state reaction route....

	From DC conductivity		From mobility
Copper content	Region I	Region II	Region I	Region II
x	ΔE₁ [eV]	ΔE₂ [eV]	ΔE₁ [eV]	ΔE₂ [eV]

0.1	0.45	0.66	0.23	0.61
0.15	0.35	0.87	0.39	0.86
0.2	0.36	0.92	0.29	0.81
0.25	0.73	0.9	0.26	0.84

DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

Online veröffentlicht: 08. Feb. 2017

Seitenbereich: 40 - 44

Eingereicht: 11. Apr. 2016

Akzeptiert: 17. Nov. 2016

DOI: https://doi.org/10.1515/msp-2017-0003

Schlüsselwörter
ferrites, conduction mechanism, Seebeck coefficient, mobility

© 2017 W. Madhuri, S. Roopas Kiran, M. Penchal Reddy, N. Ramamanohar Reddy, K.V. Siva Kumar

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Activation energies from DC conductivity studies and mobility of Mg0.5−xCuxZn0.5Fe1.9O4−δ.

DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

Online veröffentlicht: 08. Feb. 2017

Seitenbereich: 40 - 44

Eingereicht: 11. Apr. 2016

Akzeptiert: 17. Nov. 2016

DOI: https://doi.org/10.1515/msp-2017-0003

Schlüsselwörterferrites, conduction mechanism, Seebeck coefficient, mobility

© 2017 W. Madhuri, S. Roopas Kiran, M. Penchal Reddy, N. Ramamanohar Reddy, K.V. Siva Kumar

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Activation energies from DC conductivity studies and mobility of Mg0.5−xCuxZn0.5Fe1.9O4−δ.

Schlüsselwörter
ferrites, conduction mechanism, Seebeck coefficient, mobility