Issue 22, 2008

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

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

Article information

Article type
Paper
Submitted
12 Dec 2007
Accepted
20 Mar 2008
First published
23 Apr 2008

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

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements