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A large number of titanium silicates are known to exist in the mineral realm and recently a considerable literature has developed concerned with the synthesis and properties of these and related compounds. This paper describes two such families that have tunnel structures filled with cations that may easily be exchanged. A sodium titanosilicate of ideal formula, Na 2 Ti 2 O 3 ...
The ion exchange behavior of a sodium and a potassium titanosilicate towards Cs + and Sr 2+ was studied. The materials of interest in this study are titanium and silicon structural analogs of the mineral pharmacosiderite. Pharmacosiderite is a non-aluminosilicate molecular sieve with the framework composition [Fe 4 (OH) 4 (AsO 4 ) 3 ] - ...
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