Abstract

Sodium titanium dioxide bronzes were prepared under hydrothermal conditions. The bronzes could be classified into two groups on the basis of their preparation temperatures. One was synthesized below 300°C and had a disordered distribution of sodium ions in a host lattice of chemical composition TiO 2. The other obtained above 350°C took a sodium-ordered arrangement resulting in a superlattice. The ordered phase was shown by heating to change into a sodium-disordered form by way of another sodium-ordered form. It was considered that the first ordered phase was hydrated titanium dioxide bronze and the second ordered phase was a true sodium-ordered dioxide bronze.

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