Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1217
Full metadata record
DC FieldValueLanguage
dc.contributor.authorVaisakhan Thampi, D S-
dc.contributor.authorPrabhakar Rao, P-
dc.contributor.authorRadhakrishnan, A N-
dc.date.accessioned2014-03-26T04:45:05Z-
dc.date.available2014-03-26T04:45:05Z-
dc.date.issued2014-
dc.identifier.citationRSC Advances 4(24):12321-12329 ;2014en_US
dc.identifier.issn2046-2069-
dc.identifier.urihttp://ir.niist.res.in:8080/jspui/handle/123456789/1217-
dc.description.abstractCerium substituted rare earth zirconates of the form Sm2Zr2_xCexO7 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were synthesized via solid state reaction route. Structural, morphological and electrical characterizations were conducted using high temperature X-ray diffraction, FT Raman spectroscopy, thermo-mechanical analysis, scanning electron microscopy and impedance spectroscopy techniques. Addition of Ce ions into the crystal induced structural disorder to both cationic and anionic sublattices, gradually transforming the unit cell from an ordered pyrochlore to a defect fluorite structure. Substitution of bigger Ce ions to the Zr sites led to an increase in the lattice parameter and a decrease in thermal expansion coefficient of the material. The ionic disorder led to a decreased energy barrier for the thermally activated conduction process thereby increasing the overall conductivity of the materials. The maximum value of total conductivity observed in this study is 3.93 x 10-3 S cm-1 at 1023 K, which is higher than the recently reported values in a similar Sm2Zr2O7 system. Beyond x = 0.4, the ion–ion interaction in the disordered lattice began to dominate, leading to an increased activation energy and decreased total conductivity. The results demonstrate that the thermal expansion of these oxides is predominantly influenced by the B–O bond energy rather than the Madelung binding energy.en_US
dc.language.isoenen_US
dc.publisherRoyal Society of Chemistryen_US
dc.subjectCerium substituted rare earth zirconatesen_US
dc.subjectPyrochlore structured compoundsen_US
dc.titleInfluence of Ce substitution on the order-to-disorder structural transition, thermal expansion and electrical properties in Sm2Zr2_xCexO7 systemen_US
dc.typeArticleen_US
Appears in Collections:2014

Files in This Item:
File Description SizeFormat 
2014-13.pdf
  Restricted Access
1.26 MBAdobe PDFView/Open Request a copy


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.