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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 13, Number 2
BKCSDE 13(2)
February 20, 1992 

Infrared Spectra and Electrical Conductivity of The Solid Solutions X MgO + (1-X) α-Nb2O5; 0.01≤X≤0.09
Zin Park, Jong Sik Park, Dong Hoon Lee, Jong Ho Jun, Chul Hyun Yo, Keu Hong Kim*
Changes in network structures of α-Nb2O5 in the X MgO+(1-X) α-Nb2O5 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 Mg2+ ions occupy the octahedral sites in parent crystal lattice. Electrical conductivities were measured as a function of temperature from 600 to 1050℃ and PO2 form 1×10-5 to 2×10-1 atm. The defect structure and conduction mechanism were deduced from the results. The 1/n value in σ ∝PO21/n is found to be -1/4 with single possible defect model. From the activation energy (Ea = 1.67-1.73 eV) and the 1/n value, electronic conduction mechanism is suggested with a doubly charged oxygen vacancy.
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