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

摘要

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 particle 1 can 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 Ti3O5 particle 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.

主权项

1. A method for producing a titanium oxide particle comprising:
a step of mixing a titanium chloride aqueous solution with an ammonium aqueous solution to prepare a mixture solution and produce a titanium hydroxide compound particle by a hydroxylation reaction in a water phase of a mixture solution; a step of adding a silane compound to the mixture solution to produce a silica-coated titanium hydroxide compound particle; and a step of calcining the silica-coated titanium hydroxide compound particle separated from the mixture solution under a hydrogen atmosphere to produce a Ti3O5 particle body in a microparticle shape which is coated with silica glass.