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Ion-Exchange Properties of Alkali-Metal Redox-Intercalated Vanadyl Phosphate

✍ Scribed by Vı́tězslav Zima; Ludvı́k Beneš; Klára Melánová; Milan Vlček

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
292 KB
Volume
163
Category
Article
ISSN
0022-4596

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✦ Synopsis

Ion exchange of alkali metals in M x VOPO 4 ' yH 2 O (M ‫؍‬ H, Na, K, Rb, Cs) is reported. The role of valence, size, and a7nity of the cations in the exchange process is discussed. The interlayer distance in the H 1+x K x VOPO ' yH 2 O system is discussed in terms of 5nite layer rigidity theory. Di4erent behavior is observed for K x Na 1+x VOPO 4 ' yH 2 O dependening on the starting compound used. When potassium in KVOPO 4 ' H O is exchanged for Na ؉ , one phase compound is formed. In contrast, K x Na 1+x VOPO 4 ' yH O formed from NaVOPO ' H O and K ؉ is a multiphase system. Ion exchange does not proceed when exchanging ions di4er distinctly from each other in size, e.g., sodium and cesium.

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