Issue 22, 2008
From the journal:

Physical Chemistry Chemical Physics

High temperature NMR study of the local structure of molten LaF3–AF (A = Li, Na, K and Rb) mixtures

Anne-Laure Rollet,*a   Stéphanie Godierb  and  Catherine Bessadaa  

* Corresponding authors

a Centre de Recherche sur les Matériaux à Haute Température – CNRS, 1D avenue de la Recherche Scientifique, Orléans cedex 2, France
E-mail: rollet@cnrs-orleans.fr; bessada@cnrs-orleans.fr
Tel: 33 2 38257682

b Recherche et Avenir – Association Européenne pour l’Education et la Recherche en Sciences, 11 rue Velasquez – BP 209, Cannes cedex, France
E-mail: stephanie.godier@rechercheetavenir.eu

Abstract

The local structures of molten lanthanum alkali fluoride binaries have been studied using HT NMR technique. The chemical shifts of 19F, 23Na and 139La in solid and in liquid have been compared for AF (A = alkali) and LaF3. In pure molten alkali fluorides, the polarisability of anion–cation pairs appears to be a key parameter to depict the observed evolution of 19F chemical shifts. The influence of the composition has also been studied by measuring the chemical shifts in molten LaF3–AF as a function of LaF3 concentration. A strong influence of the alkali influence is observed. The coordination number of lanthanum is decreased versusAF amount all the more since the alkali atomic number is high. Moreover, the more polarisable the alkali, the less bridging fluorines between the LaFx units.

Graphical abstract: High temperature NMR study of the local structure of molten LaF3–AF (A = Li, Na, K and Rb) mixtures

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Article information

DOI
https://doi.org/10.1039/B719158H
Article type
Paper
Submitted
12 Dec 2007
Accepted
20 Mar 2008
First published
23 Apr 2008

Phys. Chem. Chem. Phys., 2008,10, 3222-3228

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High temperature NMR study of the local structure of molten LaF3–AF (A = Li, Na, K and Rb) mixtures

A. Rollet, S. Godier and C. Bessada, Phys. Chem. Chem. Phys., 2008, 10, 3222 DOI: 10.1039/B719158H

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