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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Abstract

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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Indian Academy of Sciences.
Uncontrolled Keywords:	Layered ceramics; solid state reaction; frequency dependence dielectric response
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	10 Apr 2012 09:45
Last Modified:	10 Apr 2012 09:45
URI:	http://npl.csircentral.net/id/eprint/103

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