Advances in materials Research

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Optical and dielectric properties of nano BaNbO3 prepared by a combustion technique

  • Vidya, S. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College) ;
  • Mathai, K.C. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College) ;
  • John, Annamma (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College) ;
  • Solomon, Sam (Dielectric Materials Research Laboratory, Department of Physics, St. John's College) ;
  • Joy, K. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College) ;
  • Thomas, J.K. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College)
  • Received : 2013.06.29
  • Accepted : 2013.03.19
  • Published : 2013.09.25
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Abstract

Nanocrystalline Barium niobate ($BaNbO_3$) has been synthesized by a novel auto-igniting combustion technique. The X-Ray diffraction studies reveals that $BaNbO_3$ posses a cubic structure with lattice constant $a=4.071{\AA}$. Phase purity and structure of the nano powder are further examined using Fourier-Transform Infrared and Raman spectroscopy. The average particle size of the as prepared nano particles from the Transmission Electron Microscopy is 20 nm. The UV-Vis absorption spectra of the samples are recorded and the calculated average optical band gap is 3.74eV. The sample is sintered at an optimized temperature of $1425^{\circ}C$ for 2h and attained nearly 98% of the theoretical density. The morphology of the sintered pellet is studied with Scanning Electron Microscopy. The dielectric constant and loss factor of a well-sintered $BaNbO_3$ at 5MHz sample is found to be 32.92 and $8.09{\times}10^{-4}$ respectively, at room temperature. The temperature coefficient of dielectric constant was $-179pp/^{\circ}C$. The high dielectric constant, low loss and negative temperature coefficient of dielectric constant makes it a potential candidate for temperature sensitive dielectric applications.

Keywords

References

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