Abstract
Silver titanium oxides in the Ag–Ti–O ternary system (ATO) have been reported as monoclinic phase structures, but no other types of structures have been reported to date. In this study, we report cubic-type silver titanium oxide with a spinel-based structure. Cubic-type ATO was successfully synthesized via the Ag+ ion-exchange reaction of spinel-type sodium titanium oxide (NTO). Ag+ preferentially substituted Na+ in the spinel 8a-site (oxygen tetrahedral site) of the NTO material by the AgNO3 aqueous solution process. Further, ion- exchange thoroughly proceeded via the thermal process of NTO by AgNO3 in the KNO3 melt. The X-ray diffraction pattern of the obtained powder clearly showed cubic-phase diffraction peaks (a = 8.84 Å) corresponding to the spinel-based structure with Ag+ occupying the 8a-site. Elemental analysis confirmed that pure ATO material could be synthesized with Ag2.86Ti5O11.43 formula.
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