Structural And Ac Electrical Properties Of A Newly Synthesized Single Phase Rare Earth Double Perovskite Oxide: Ba2cenbo6
Abstract
A singlephaserareearthdoubleperovskiteoxideBa2CeNbO6 (BCN) issynthesizedbysolid-state
reactiontechniqueforthefirsttime.TheX-raydiffractionpatternofthesampleatroomtemperature
showsmonoclinicstructure,withthelatticeparameters, a¼5.9763 ˚ A, b¼5.975 ˚Aand c¼8.48 ˚A and
b¼90.041. Impedancespectroscopyisusedtostudytheacelectricalbehaviorofthismaterialasa
functionoffrequency(102–106 Hz) atvarioustemperatures(30–450 1C). Arelaxationisobservedinthe
entire temperaturerange.Conductionmechanismisinvestigatedbyfittingthecompleximpedance
data toCole–Coleequation.Compleximpedanceplaneplotsshowonlyonesemicirculararc,indicating
only thegraincontributionofdielectricrelaxation.Thescalingbehaviorofimaginarypartofelectric
modulus(M00) andimaginarypartofelectricalimpedance(Z00) suggeststhattherelaxationdescribesthe
same mechanismatvarioustemperatures.Thefrequencydependenceofconductivityisinterpretedin
terms ofthejumprelaxationmodelandisfittedtoJonscher’spowerlaw.Thevaluesofdc
conductivitiesextractedfromtheJonscherpowerlawvariesfrom2.79 10 7 to 3.5 10 5 Sm 1
with theincreaseintemperaturefrom100to450 1C. Theactivationenergies(0.37eV)extractedfrom
M00(o) and Z00(o) peaksarefoundtofollowtheArrheniuslaw
URI
1. Full Text Link ->http://www.sciencedirect.com/science/article/pii/S0921452611001608#
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