Effect of Ce4+ substitution on the structural, electrical and dielectric properties of NiAl2O4 spinel
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Effect of Ce4+ substitution on the structural, electrical
and dielectric properties of NiAl2O4 spinel
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| Creator |
Augustin, C.O.
Hema, K. Berchmans, L.J. Kalaiselvan, R. Saraswathi, R. |
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| Subject |
Electropyrometallurgy
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| Description |
The structural, electrical and dielectric properties of a series of Ni1–xCexAl2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8)
compositions have been studied. The samples were prepared by a novel glycine–nitrate combustion synthesis
route. The substitution of Ce4+ for Ni2+ results in an increase in the lattice constant owing to the larger
size of the substituent. The X-ray density increases with increasing Ce4+ content. The IR spectra show
two fundamental absorption bands, which are shifted gradually towards higher energy with the addition of
Ce4+. The UV–visible spectra confirm the preference of Ni2+ for the octahedral site. The dc electrical conductivity
increases with increasing temperature due to the mobility of thermally activated charge carriers.
Due to the electrostatic screening effect of B-site cations, the conductivity decreases with increasing Ce4+
content. The dielectric constant and loss tangent of the synthesized compounds show the normal behavior
of spinel compounds. The ac electrical conductivity increases with increasing applied frequency and decreases
with increasing Ce4+ substitution.
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| Publisher |
Wiley-VCH Verlag
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| Date |
2005
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/150/1/081-2005.pdf
Augustin, C.O. and Hema, K. and Berchmans, L.J. and Kalaiselvan, R. and Saraswathi, R. (2005) Effect of Ce4+ substitution on the structural, electrical and dielectric properties of NiAl2O4 spinel. Physica Status Solidi A, 202 (6). pp. 1017-1024. |
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| Relation |
http://cecri.csircentral.net/150/
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