Fast ion conduction in the defect pyrochlore system KBxW2−xO6(B = Al, Ti and Ta) Academic Article uri icon


  • K+ ionic conductivity has been measured by the complex impedence method for the defect pyrochlore type compounds of the general formula K(By+xW6+2-x)O6, (x=1/(6-y)) where B=Al3+, Ti4+ and Ta5+. Thermogravimetric analysis showed the compounds to be hydrated at room temperature with from {reversed tilde}0.2 mole for the Al compound to {reversed tilde}1 mole of water for the Ta substituted phase. There is a correlation between the lattice parameter and amount of water present in the cavities. The ionic conductivity of 5.2×10-3 ω-1 cm-1 at 300°C for KAl0.33W1.67O6 is found to be best among known KB2O6 type pyrochlores. High ionic conductivity has been explained on the basis of occupancy of K+ ions in the available sites and polarization of the B2X6 network. © 1985.

author list (cited authors)

  • Subramanian, M. A., Subramanian, R., & Clearfield, A.

citation count

  • 18

publication date

  • February 1985