Effect of Mn doping on magnetodielectric properties of polycrystalline BiFeO3 ceramics

This report reveals the room temperature magnetodielectric effect of polycrystalline BiFe0.8Mn0.2O3 ceramics. Structural analysis shows that the additional phases of BiFe0.8Mn0.2O3 are suppressed and compared with bare BiFeO3. The difference in dissociation energies between Mn–O and Bi–O bonds traps...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 854; p. 156981
Main Authors Rajesh, R., Giridharan, N.V., Kumar, K. Ramesh, Karthika, C.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.02.2021
Elsevier BV
Subjects
BiFeO3
Bismuth ferrite
Ceramics
Coupling coefficients
Dielectric and magnetodielectric effect
Dielectric strength
Ferromagnetism
Grain size
Magnetic properties
Magnetization
Manganese
Oxidation
Oxygen ions
Polycrystals
Rietveld refinement
Room temperature
Structural analysis
BiFeO3
Rietveld refinement
Magnetization
Dielectric and magnetodielectric effect
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Summary:This report reveals the room temperature magnetodielectric effect of polycrystalline BiFe0.8Mn0.2O3 ceramics. Structural analysis shows that the additional phases of BiFe0.8Mn0.2O3 are suppressed and compared with bare BiFeO3. The difference in dissociation energies between Mn–O and Bi–O bonds traps the motion of oxygen ions and reduces the grain size of BiFe0.8Mn0.2O3. Mn-doped BiFeO3 samples exhibit a weak ferromagnetic response because of the effect of Mn in the Fe site which uncurls the spiral spin ordering by altering the canting angle. Additionally, Bi vacancies give rise to charge compensating oxidation of Mn3+/ Mn4+ which causes the ferromagnetic weaker. BiFe0.8Mn0.2O3 shows an improved dielectric permittivity compared to BiFe0.9Mn0.1O3 and BiFeO3 respectively. The magnetodielectric coupling coefficient of BiFe0.8Mn0.2O3 ceramic at 6 kOe and 1 MHz is determined to be 4.64%. ∙We report on the room temperature magnetodielectric effect of polycrystalline BiFe0.8Mn0.2FeO3 ceramics.∙The variation in tilt angle affects the spiral spin ordering and alter the canting angle as revealed from magnetization studies.∙The magnetization, dielectric polarization and hence magnetodielectric effect are significantly improved in BiFe0.8Mn0.2FeO3 than in BiFe0.9Mn0.1FeO3 and host BiFeO3.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156981