The University of Tokyo

Yoshihide Tsunobuchi

Kazuhito Hashimoto

Shin-ichi Ohkoshi

Hiroko Tokoro

Fumiyoshi Hakoe

Tomoyuki Matsuda

Deepa Dey

A titanium oxide particle that can develop non-conventional and novel physical properties, a method for manufacturing the same, and a magnetic memory, an optical information recording medium, and a charge accumulation type memory using the same are provided. A silica-coated titanium hydroxide compound particle is directly produced through a sol-gel technique and not through a reverse micelle technique, and the silica-coated titanium hydroxide compound particle is subjected to a calcination process. Hence, a titanium oxide particlecan be provided which can develop non-conventional and novel physical properties such that it does not perform phase transition at a room temperature and a TiOparticle body can always maintain the characteristic as a paramagnetic metal in all temperature ranges unlike conventional bulk bodies that perform phase transition between a non-magnetic semiconductor and a paramagnetic metal at a temperature near about 460 K.

Titanium oxide particles, process for producing same, magnetic memory, optical information recording medium, and charge accumulation type memory

A microstructure that can develop non-conventional and novel physical properties and a method for producing the same are provided. Ethanol is added to a mixture solution produced by adding a surfactant solution to a peroxotitanic acid aqueous solution to produce precipitates, and the precipitates collected from the mixture solution are let dried to produce precursor powders. The precursor powdersare calcined at a predetermined temperature. Accordingly, a microstructurecan be produced which is formed of monophasic TiOin nano size. The microstructureof monophasic TiOproduced in this fashion can be fine-grained in nano size unlike prior-art crystals.

Microstructure and manufacturing method therefor

There are provided titanium oxide particles capable of manifesting an unprecedented property, a manufacturing method thereof and a magnetic memory as well as a charge storage type memory employing the titanium oxide particles. Unlike-conventional bulk bodies phase-transited between nonmagnetic semiconductors and paramagnetic metals around about 460K, provided are titanium oxide particlescapable of manifesting an unprecedented property that TiOparticles do not undergo phase transitions at room temperature and allow a paramagnetic metal property thereof to be consistently maintained in any temperature range.

Titanium oxide particles, manufacturing method thereof, magnetic memory, and charge storage type memory

There are provided a fine structural body capable of manifesting an unprecedented property; a manufacturing method thereof; and a magnetic memory, a charge storage memory and an optical information recording medium employing such fine structural body. Unlike conventional bulk bodies phase-transited between nonmagnetic semiconductors and paramagnetic metals around about 460K, there can be provided a fine structural bodycomprised of TiO, but capable of manifesting an unprecedented property in which a paramagnetic metal property thereof is consistently maintained in all temperature ranges without undergoing phase transition to a nonmagnetic semiconductor.

Growing community of inventors

Tokyo, Japan

Yoshihide Tsunobuchi