An Ionic Model for FECL3-Based Melts from a Study of the Molecular Dimer and Other Molecular Structures
作者:
Z. Akdeniz,
G. Pastore,
M.P. Tosi,
期刊:
Physics and Chemistry of Liquids
(Taylor Available online 1997)
卷期:
Volume 35,
issue 2
页码: 93-104
ISSN:0031-9104
年代: 1997
DOI:10.1080/00319109708030577
出版商: Taylor & Francis Group
关键词: Molten salts;molecular structures
数据来源: Taylor
摘要:
A model of ionic interactions accounting for ionic polarizability through electrostatic and shell deformation dipoles is developed for applications to molten iron trichloride and its mixtures with alkali chlorides in the acidic range of composition. The main focus is on (i) bond lengths and bond angles in molecular clusters as possible precursors of local structures in melts, and (ii) stability of local structures against fluctuations into ionized states. The determination of the ionic interactions is based on structural properties of the neutral monomer and dimer in the vapour phase, in parallel with, and using some input from, our earlier study of aluminium trichloride. The model is used to study the structure of charge-carrying clusters obtained from the monomer ((FeCl4)−and (FeCl2)+) and from the dimer ((Fe2Cl7)−and (Fe2Cl5)+); it is also tested through calculations of the vibrational frequencies of the various clusters. The role of the metal ion polarizability is discussed with regard to FeCl3and Fe2Cl6. Comparisons with data from experiment and from molecular orbital calculations are presented.
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