DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

• Autorzy: Madhuri W. , Kiran S. R. , Reddy M. P. , Reddy N. R. , Kumar K. V. S.

Identyfikatory

DOI

10.1515/msp-2017-0003

• Języki publikacji: EN

Abstrakty

EN

Nonstoichiometric series of Mg_0.5−xCu_xZn_0.5 Fe_1.9 O_4-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.

Słowa kluczowe

EN

ferrites; conduction mechanism; Seebeck coefficient; mobility

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2017
• Tom: Vol. 35, No. 1
• Strony: 40--44
• Opis fizyczny: Bibliogr. 23 poz., rys.

Twórcy

autor

Madhuri W.

• School of Advanced Sciences, VIT University, Vellore, 632 014, India
• IFW, Leibniz Institute for Solid State and Materials Research, Technische Universitat Dresden, 01069 Dresden, Germany

autor

Kiran S. R.

• School of Advanced Sciences, VIT University, Vellore, 632 014, India

autor

Reddy M. P.

• Center for Advanced Materials, Qatar University, Doha 2713, Qatar

autor

Reddy N. R.

• Department of Materials Science &Nanotechnology, Yogi Vemana University, Kadapa, 516 227, India

autor

Kumar K. V. S.

• Ceramic Composites Materials Laboratory, Sri Krishnadevaraya University, Anantapur 515 055, India

Bibliografia

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).