Advances in materials Research

  • 제2권3호
  • /
  • Pages.141-153
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  • 2013
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  • 2234-0912(pISSN)
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  • 2234-179X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

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)
  • 투고 : 2013.06.29
  • 심사 : 2013.03.19
  • 발행 : 2013.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

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피인용 문헌

  1. Synthesis and characterization of novel reduced graphene oxide supported barium niobate (RGOBN) nanocomposite with enhanced ferroelectric properties and thermal stability vol.29, pp.22, 2018, https://doi.org/10.1007/s10854-018-0049-2