Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1605
Title: Manganese double substituted pyrochlore type semiconducting oxides for high temperature NTC thermistor applications
Authors: Sumi, S
Prabhakar Rao, P
Peter Koshy
Keywords: Manganese double substituted pyrochlore
Semiconducting oxides
Negative temperature coefficient
Issue Date: 2014
Publisher: Springer
Citation: Journal of Materials Science-Materials in Electronics 25(7):2985-2991; July 2014
Abstract: The effect of simultaneous substitution of Mn in both A and B sites of the pyrochlore type semiconducting oxides: (CaCe1-2x Mn-2x )(Sn1-x Mn (x) Nb)O7-delta (x = 0, 0.1, 0.2, 0.3 and 0.4) was studied by employing powder X-ray diffraction, Raman spectroscopy, scanning electron microscopy and electrical conductivity measurements. Besides the structural confirmation, Raman spectroscopy studies revealed the increased local disordering in the structure with progressive Mn substitution which is not observable in X-ray diffraction studies. The conductivity measurements confirm the negative temperature coefficient (NTC) behavior of the samples. Grain boundary dominant electrical characteristics have been observed in compounds with higher Mn concentration. Thermistor constant of the system lies in the range 6,700-8,500 K and the sensitivity values are in the range -1 to -2 %. The double substitution of Mn in this system offers to tune the NTC thermistor properties with increased localization of electrons in the lattice.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/1605
ISSN: 0957-4522
Appears in Collections:2014

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