Solid State Ionics, Vol.138, No.3-4, 233-242, 2001
Investigation by impedance and F-19-NMR spectroscopies of a new oxyfluoride solid solution range in the NaF-BiF3-Bi2O3 system
A wide range of fluorite-type oxyfluoride solid solutions is exhibited in the NaF-BiF3-Bi2O3 system. Starting from the entirely fluoride Na0.5(1-z)Bi0.5(1+z)F(2+z) solid solution along the NaF-BiF3 line, the range is extended towards BiOF and the various range compositions can be formulated Na0.5(1-z--h)Bi0.5(1+z+h)F2+z-hOh. The transport properties were studied as a function of the anion excess (z) and the oxygen content (h). Correlations were established between F- ion motions at long range determined by impedance spectroscopy and motions visualized over the NMR scale time. (C) 2001 Elsevier Science B.V. All rights reserved.