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Advances in Materials Research
  Volume 5, Number 3, September 2016 , pages 181-192
DOI: https://doi.org/10.12989/amr.2016.5.3.181
 

Effect of milling on the electrical properties of Ba(Fe1/2Ta1/2)O3 ceramic
Uttam K. Mahto, Sumit K. Roy, S. Chaudhuri and K. Prasad

 
Abstract
    In this work effect of high energy milling on the structural and electrical properties of Ba(Fe1/2Ta1/2)O3 (BFT) ceramic synthesized using standard solid-state reaction method were investigated. X-ray diffraction studies indicated that the unit cell structure for all the samples to be hexagonal (space group: P3m1). FTIR spectra also confirmed the formation of BFT without any new phase. The milled (10 h) BFT ceramic showed the formation of small grain sizes (<2 µm) which is beneficial for dielectric applications in high density integrated devices. Besides, the milled (10 h) BFT ceramic sample exhibited superior dielectric properties (enhancement in ε´-value and reduction in tgδ - value) compared to un-milled one. Impedance analysis indicated the negative temperature coefficient of resistance (NTCR) character. The correlated barrier hopping model (jump relaxation type) is found to successfully explain the mechanism of charge transport in present ceramic samples.
 
Key Words
    Ba(Fe1/2Ta1/2)O3; lead-free; structure; perovskite; dielectric constant; FTIR spectroscopy; electroceramic
 
Address
Uttam K. Mahto, K. Prasad: Aryabhatta Centre for Nanoscience and Nanotechnology, Aryabhatta Knowledge University, Patna 800001, India

Sumit K. Roy, S. Chaudhuri: Department of Physics, St. Xavier´s College, Ranchi 834001, India

K. Prasad: University Department of Physics, T.M. Bhagalpur University, Bhagalpur 812 007, India
 

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