1. Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics.
- Author
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Tripathy, Satya N., Pradhan, Dhiren K., Mishra, Karuna K., Sen, Shrabanee, Palai, Ratnakar, Paulch, Marian, Scott, James F., Katiyar, Ram S., and Pradhan, Dillip K.
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CRYSTAL structure , *PHASE transitions , *DIELECTRIC materials , *MULTIFERROIC materials , *RIETVELD refinement , *X-ray diffraction , *FIELD emission , *SCANNING electron microscopy - 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. Magnetoimpedance spectroscopy reveals a significant change (∼18%) in dielectric permittivity at H=2T for x=0.2. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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