19F NMR Investigation of Quenched Sr1-xBixF2+x Solid Solutions: Correlations between Short Range Ordering and Ionic Conductivity
✍ Scribed by Suh Kyung Soo; J. Senegas; J.M. Reau; M. Wahbi; P. Hagenmuller
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 261 KB
- Volume
- 104
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
A ({ }^{19} \mathrm{~F}) NMR investigation of fluorite-type (\mathrm{Sr}{1-x} \mathrm{Bi}{x} \mathrm{~F}{2+x}) solid solutions ((0 \leq x \leq 0.50)) has been carried out on samples quenched from (700^{\circ} \mathrm{C}). The interpretation of the NMR signal is based on the existence of different fluoride ion sublattices and partial exchange between them at increasing temperature. The NMR study confirms the validity of the clustering process proposed for (\mathrm{Sr}{1-x} \mathrm{Bi}{x} \mathrm{~F}{2+x}) on the basis of electrical conductivity and neutron diffraction results; i.e., progressive transformation with rising (x) of (3: 2: 3: 0) into (1: 0: 3: 0) clusters. Furthermore, the ({ }^{19} \mathrm{~F}) NMR investigation has made it possible to show that the interstitial fluorine anions of (\mathrm{F}^{\prime}) type (\left(\frac{1}{2}, u, u: u \approx 0.37\right.) ) are responsible for the long range motions in (\mathrm{Sr}{1-x} \mathrm{Bi}{x} \mathrm{~F}_{2+x}). 1993 Academic Press, lnc.