Effect of paramagnetic manganese ions doping on frequency and high temperature dependence dielectric response of layered Na(1.9)Li(0.1)Ti(3)O(7) ceramics
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Effect of paramagnetic manganese ions doping on frequency and high temperature dependence dielectric response of layered Na(1.9)Li(0.1)Ti(3)O(7) ceramics
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| Creator |
Pal, Dharmendra
Pandey, J. L. |
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| Subject |
Materials Science
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| Description |
The manganese doped layered ceramic samples (Na1·9Li0·1)Ti3O7 : XMn(0·01≤X≤0·1) have been
prepared using high temperature solid state reaction. The room temperature electron paramagnetic resonance
(EPR) investigations exhibit that at lower percentage of doping the substitution of manganese ions occur as Mn3+ at
Ti4+ sites, whereas for higher percentage of doping Mn2+ ions occupy the two different interlayer sodium/lithium
sites. In both cases, the charge compensation mechanism should operate to maintain the overall charge neutrality of
the lattice. The manganese doped derivatives of layered Na1·9Li0·1Ti3O7 (SLT) ceramics have been investigated
through frequency dependence dielectric spectroscopy in this work. The results indicate that the dielectric losses in
these ceramics are the collective contribution of electric conduction, dipole orientation and space charge
polarization. Smeared peaks in temperature dependence of permittivity plots suggest diffuse nature of high
temperature ferroelectric phase transition. The light manganese doping in SLT enhances the dielectric constant.
However, manganese doping decreases dielectric loss due to inhibition of domain wall motion, enhances electronhopping
conduction, and impedes the interlayer ionic conduction as well. Manganese doping also gives rise to contraction of interlayer space.
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| Publisher |
Indian Academy of Sciences.
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| Date |
2010-12-06
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/103/1/81.pdf
Pal, Dharmendra and Pandey, J. L. (2010) Effect of paramagnetic manganese ions doping on frequency and high temperature dependence dielectric response of layered Na(1.9)Li(0.1)Ti(3)O(7) ceramics. Bulletin of Materials Science , 33 (6). pp. 691-696. ISSN 0973-7669 |
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| Relation |
http://www.ias.ac.in/matersci/bmsdec2010/691.pdf
http://npl.csircentral.net/103/ |
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