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Infrared Spectra and Electrical Conductivity of The Solid Solutions X MgO + (1-X) ${\alpha}-Nb_2$ $O_5$; 0.01{\leq}X{\leq}0.09

  • Park Zin (Department of Chemistry, Yonsei University) ;
  • Park, Jong Sik (Department of Chemistry, Yonsei University) ;
  • Lee Dong Hoon (Department of Chemistry, Yonsei University) ;
  • Jun Jong Ho (Department of Biochemistry, Kon-Kuk University) ;
  • Yo Chul Hyun (Department of Chemistry, Yonsei University) ;
  • Kim Keu Hong (Department of Chemistry, Yonsei University)
  • 발행 : 1992.04.20

초록

Changes in network structures of ${\alpha}-Nb_2O_5$ in the X MgO+(1-X) ${\alpha}-Nb_2O_5$ solid solutions occurring as the MgO doping level (X) was varied were investigated by means of infrared spectroscopy and X-ray analysis. X-ray diffraction revealed that all the synthesized specimens have the monoclinic structure. The FT-IR spectroscopy showed that the system investigated forms the solid solutions in which $Mg^{2+}$ ions occupy the octahedral sites in parent crystal lattice. Electrical conductivities were measured as a function of temperature from 600 to $1050{\circ}$ and $P_{O2}$ form $1{\times}10^{-5}$ to $2{\times}10^{-1}$ atm. The defect structure and conduction mechanism were deduced from the results. The $1}n$ value in ${\alpha}{\propto}{P_{O2}^{1}n}}$ is found to be -1/4 with single possible defect model. From the activation energy ($E{\alpha}$ = 1.67-1.73 eV) and the1/n value, electronic conduction mechanism is suggested with a doubly charged oxygen vacancy.

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