Header menu link for other important links
X
Crystal structure refinement, enhanced magnetic and dielectric properties of Na0.5Bi0.5TiO3 modified Bi0.8Ba0.2FeO3 ceramics
Ajay Kumar
Published in Elsevier Ltd
2017
Volume: 43
   
Issue: 5
Pages: 4622 - 4629
Abstract
(1-x) Na0.5Bi0.5TiO3–x(Bi0.8Ba0.2FeO3) (x=0.5, 0.6, 0.7, and 0.8) ceramics were synthesized via solid state reaction method. Powder X-ray diffraction investigations performed at room temperature along with Rietveld analysis show all the composites to exhibit a rhombohedral distorted perovskite structure, described by space group R3c. Rietveld refinement confirmed a good agreement between observed and calculated intensities and a low value of goodness of fit (χ2). Magnetic measurements were carried out at room temperature up to a field of 6 kOe. Magnetic properties of BBFO modified NBT ceramics are improved with a significant opening in the M–H hysteresis loop at room temperature. Remanent magnetization and coercive field increased with increase of BBFO concentration. The dielectric response of these samples was analyzed in the frequency range 10 Hz–7 MHz at different temperatures revealing a dispersion in dielectric constant (ε′) and in dissipation factor (tan δ) at lower frequencies. Both ε′ and tan δ increase with increase of BBFO content. The temperature dependence of frequency exponent ′s′ of power law suggests that quantum mechanical tunneling (QMT) model to be applicable at lower temperature and correlated barrier hopping (CBH) mechanism to be appropriate at higher temperature to describe the conduction mechanism in x=0.5 and x=0.6 samples. Further, with increase in BBFO content, the dielectric constant becomes more stable at higher frequencies and temperatures thereby improving the dielectric properties of the material. © 2016 Elsevier Ltd and Techna Group S.r.l.
About the journal
JournalData powered by TypesetCeramics International
PublisherData powered by TypesetElsevier Ltd
ISSN02728842
Open AccessNo
Concepts (23)
  •  related image
    Ceramic materials
  •  related image
    Dielectric properties
  •  related image
    Iron oxides
  •  related image
    Magnetic materials
  •  related image
    Magnetic properties
  •  related image
    Magnetism
  •  related image
    Mechanisms
  •  related image
    Quantum theory
  •  related image
    Rietveld analysis
  •  related image
    Rietveld refinement
  •  related image
    Sodium
  •  related image
    Solid state reactions
  •  related image
    Temperature distribution
  •  related image
    X ray diffraction
  •  related image
    Correlated barrier hopping
  •  related image
    CRYSTAL STRUCTURE REFINEMENT
  •  related image
    Magnetic and dielectric properties
  •  related image
    Powder x ray diffraction
  •  related image
    POWDERS: SOLID STATE REACTIONS
  •  related image
    Quantum-mechanical tunneling
  •  related image
    SOLID STATE REACTION METHOD
  •  related image
    X RAY METHODS
  •  related image
    Crystal structure