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Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

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Scott_PhaseTransition_JoAP_FinalPubVersion.pdf (2.904Mb)
Date
14/04/2015
Author
Tripathy, Satya N.
Pradhan, Dhiren K.
Mishra, Karuna K.
Sen, Shrabanee
Palai, Ratnakar
Paulch, Marian
Scott, James F.
Katiyar, Ram S.
Pradhan, Dillip K.
Keywords
BiFeO3 nanoparticles
Ferroelectrics
Polarization
Boundary
QC Physics
NDAS
Metadata
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Abstract
We report systematic studies on crystal structure and magneto-dielectric properties of (1 − x) BiFeO3-x DyMnO3 (0.0 ≤ x ≤ 0.2) nanoceramics synthesized by auto-combustion method. Rietveld refinement of X-ray diffraction data indicates a structural transition from R3c to R3c + Pn21a at x = 0.1. Field emission scanning electron micrographs display a decrease in grain size with increase in x. The presence of dielectric anomalies around antiferromagnetic transition temperature implies the magnetoelectric coupling. Dielectric measurements showed decrease in magnetic ordering temperature with increasing x in agreement with differential scanning calorimetry results. A significant increase in magnetization has been found with increasing DyMnO3 substitution. Magneto-impedance spectroscopy reveals a significant change (∼18%) in dielectricpermittivity at H = 2 T for x = 0.2.
Citation
Tripathy , S N , Pradhan , D K , Mishra , K K , Sen , S , Palai , R , Paulch , M , Scott , J F , Katiyar , R S & Pradhan , D K 2015 , ' Phase transition and enhanced magneto-dielectric response in BiFeO 3 -DyMnO 3 multiferroics ' , Journal of Applied Physics , vol. 117 , no. 14 , 144103 . https://doi.org/10.1063/1.4916927
Publication
Journal of Applied Physics
Status
Peer reviewed
DOI
https://doi.org/10.1063/1.4916927
ISSN
0021-8979
Type
Journal article
Rights
© 2015 AIP Publishing LLC. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://dx.doi.org/10.1063/1.4916927
Description
This work is partially supported by DST fast track Project No. SR/FTP/PS-16/2009. Dhiren K. Pradhan acknowledges IFN (NSF Grant No. EPS—01002410) for fellowship. The work at UPR was supported by National Science Foundation (NSF DMR 1410869) and Institute for Functional Nanomaterials (IFN).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8326

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