M. El Omari et al., Ionic conductivity properties and F-19 NMR investigation of Pb1-xCrxF2+x solid solutions with fluorite-type structure, SOL ST ION, 116(3-4), 1999, pp. 229-239
The F- ion transport and diffusion properties inside the solid solution Pb1
-xCrxF2+x (0 less than or equal to x less than or equal to 0.12) with fluor
ite-type structure have been determined by impedance spectroscopy and F-19
NMR investigation. The various electrical parameters of Pb1-xCrxF2+x are co
mpared with those of Pb1-xAlxF2+x (0 less than or equal to x less than or e
qual to 0.12) whose structure derives also from the fluorite-type. The Cr3 substitutional cation is of a slightly larger size than the Al3+ cation bu
t both cations offer the same usual coordination (CN = 6) in ternary fluori
des. Comparison of F-19 NMR specrra of some compositions Pb1-xMx'F2+x (M' =
Al, Cr) at different temperatures has been realized in order to discover w
hether the clustering process proposed in Pb1-xAlxF2+x can be extended to P
b1-xCrxF2+x. (C) 1999 Published by Elsevier Science B.V. All rights reserve
d.