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AIST TODAYNo.20 Spring 2006 [ PDF:3.4MB ]

Contents List Message:The autonomy of research units andthe mission of AIST Feature:The 4th AIST Advisory Board meeting Research Hot Line In Brief

A novel intergrowth form of TiO2 between rutile- and ramsdellite-type structure

Titanium dioxide with a new crystal structure was synthesized upon heating the ramsdellite-type TiO2. The new form has an intergrowth structure between the rutile- and ramsdellite-type ones. The band gap can be controlled from 3.34 eV to 3.00 eV upon heating, accompanying a continuous structural change. As the electronic structures can be controlled by the heating temperatures, the new form of TiO2 will be expected as candidate photofunctional materials.
Figure 1
 Figure 2
Figure 1: Crystal structures of rutile-type, the hypothetical intergrowth with ramsdellite and rutile (1 : 1) domains and ramsdellite-type TiO2, respectively.
Figure 2: UV-Vis absorption spectra for as-repared ramsdellite-type TiO2 at 298 K, after calcinations at 473 K and 723 K, respectively.

Relational Information

AIST TODAY Vol.6 , No.2 (2006) p.24-25

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