EPR study on the role of Mn in enhancing PTC of BaTiO3

Kutty, TRN and Murugaraj, P (1985) EPR study on the role of Mn in enhancing PTC of BaTiO3. In: Materials Letters, 3 (5-6). pp. 195-199.

PDF 231.pdf - Published Version Restricted to Registered users only Download (405kB) | Request a copy

Abstract

Low concentration of Mn (< 0.05 atom%) added to lanthanide-doped ceramics for enhancing the PTC effect did not show any EPR signal due to Mn in the tetragonal phase. Above Tc (400 K) it showed the six-line signal arising from Mn2+. This is explained on the basis of Mn existing as Mn3+ ion with short relaxation time at room temperature. Oxidation state changes to Mn2+ above Tc; thus Mn3+ acts as an electron trap. This augments the function of activated defect centres (VBa /ag VBa) in diminishing the charge carrier concentration across the phase transformation.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier Science
Additional Information:	The copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	17 Jul 2009 07:14
Last Modified:	19 Sep 2010 05:35
URI:	http://eprints.iisc.ac.in/id/eprint/20940

Actions (login required)

View Item