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

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.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics and Astronomy, National Institute of Technology, Rourkela 769008 (India)
  2. Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00936 (United States)
  3. Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)
  4. Sensor and Actuator Division, Central Glass and Ceramics Research Institute, Kolkata 700032 (India)
  5. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice (Poland)
  6. Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 OHE (United Kingdom)
Publication Date:
OSTI Identifier:
22402840
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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