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Phase formation, microstructure, electrical and magnetic properties of Mn substituted barium titanate

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Title Phase formation, microstructure, electrical and magnetic properties of Mn substituted barium titanate
 
Creator RANI, A
KOLTE, J
GOPALAN, P
 
Subject CRYSTAL-STRUCTURE
BATIO3 CERAMICS
DOPED BATIO3
TEMPERATURE
SPECTROSCOPY
Ceramics
Hexagonal
Barium titnate
Solid state reaction
Ferroelectric
Ferromagnetic
 
Description Mn doped barium titanate (BaTi1-xMnxO3) ceramics with x=0, 1, 2.5, 5, 7.5 and 10% have been synthesized by a solid state reaction method. X-Ray Diffraction (XRD) patterns reveal that, the phase transition from tetragonal to hexagonal takes place at x=1% concentration and complete hexagonal phase is obtained for x >= 5%. It is found that, the lattice parameters of the samples have been increased with Mn concentration. As the Mn concentration increases, the grain size increases and the grains develop hexagonal and rectangular morphology. The remnant polarization (P-r) for pure barium titanate (BTO) is 7.50 mu C/cm(2) and further decreases with increase in Mn concentrations. All the samples exhibit ferromagnetism at room temperature. The magnetization at a magnetic field of 5 kOe is depended on Mn concentration. It gradually increases, and reaches a maximum value of similar to 0.013 emu/g for x=10%. The origin of ferromagnetism in the samples is due to exchange interaction between the different oxidation states of Mn. The dielectric constant and dielectric loss also decreases as Mn content increases. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2016-01-14T13:17:33Z
2016-01-14T13:17:33Z
2015
 
Type Article
 
Identifier CERAMICS INTERNATIONAL, 41(10B)14057-14063
0272-8842
1873-3956
http://dx.doi.org/10.1016/j.ceramint.2015.07.023
http://dspace.library.iitb.ac.in/jspui/handle/100/17594
 
Language en