Impedance spectroscopic investigation on electrical conduction and relaxation in manganese substituted pyrochlore type semiconducting oxides

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Title:	Impedance spectroscopic investigation on electrical conduction and relaxation in manganese substituted pyrochlore type semiconducting oxides
Authors:	Sumi, S Prabhakar Rao, P Peter Koshy
Keywords:	Impedance; Electricalconductivity;Electricalproperties
Issue Date:	May-2015
Publisher:	Elsevier
Citation:	Ceramics International 41(4):5992-5998,May 2015
Abstract:	The effectofsimultaneoussubstitutionsofMninbothAandBsitesofthepyrochloretypesemiconductingoxides:(CaCe1 2xMn2x) (Sn1 xMnxINb)O7 δ (x¼0, 0.1,0.2,0.3and0.4)ontheelectricalconductionandrelaxationwasstudiedindetailusingimpedanceanalysisasa function offrequencyoverawiderangeoftemperature.Impedanceandmodulusanalysisclearlyexplaintherelaxationinthesematerialsandits dependence onMnconcentration.GrainboundarydominantelectricalcharacteristicshavebeenobservedwithprogressiveMnsubstitution. Correlated barrierhoppingmodelwassuccessfullyappliedforexplainingtheconductionmechanisminthesecompounds.Variationofhopping parameters withMnsubstitutioninthesematerialsindicatesstrongdependenceonthegrainandgrainboundarycontributions.Thisinsighttothe conduction mechanismofthesystemoffersintuningtheelectricalpropertiesfordesiredapplicationssuchasNTCthermistors
URI:	http://hdl.handle.net/123456789/2324
Appears in Collections:	2015

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