Phase transition and enhanced magneto-dielectric response in BiFeO{sub 3}-DyMnO{sub 3} multiferroics

Journal Article · Tue Apr 14 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4916927· OSTI ID:22402840

Pradhan, Dhiren K.; Palai, Ratnakar; Katiyar, Ram S. ^[1]; Mishra, Karuna K. ^[2]; Sen, Shrabanee ^[3]; Paulch, Marian ^[4]; Scott, James F. ^[5]

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1. Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00936 (United States)
2. Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)
3. Sensor and Actuator Division, Central Glass and Ceramics Research Institute, Kolkata 700032 (India)
4. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice (Poland)
5. Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 OHE (United Kingdom)

We report systematic studies on crystal structure and magneto-dielectric properties of (1 − x) BiFeO{sub 3}-x DyMnO{sub 3} (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 + Pn2{sub 1}a 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 DyMnO{sub 3} substitution. Magneto-impedance spectroscopy reveals a significant change (∼18%) in dielectric permittivity at H = 2 T for x = 0.2.

• OSTI ID: 22402840
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTROSCOPY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
CALORIMETRY
CONCENTRATION RATIO
COUPLING
DIELECTRIC MATERIALS
DYSPROSIUM COMPOUNDS
FERRITES
FIELD EMISSION
GRAIN SIZE
IMPEDANCE
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
PERMITTIVITY
PHASE TRANSFORMATIONS
TRANSITION TEMPERATURE
TRIGONAL LATTICES
X-RAY DIFFRACTION