METAL-SUBSTITUTED TITANIUM OXIDE, AND METHOD FOR PRODUCING METAL-SUBSTITUTED TITANIUM OXIDE SINTERED BODY

摘要

Proposed are a metal-substituted titanium oxide which has a composition other than conventional Ti₃O₅ while having a property of being able to undergo phase transition from a crystal structure in a paramagnetic metal state to a crystal structure of a nonmagnetic semiconductor upon application of pressure or light and which can also be used in fields other than conventional technical fields, and a method for producing a metal-substituted titanium oxide sintered body. According to the present invention, it is possible to provide a metal-substituted titanium oxide having a crystal structure which does not undergo phase transition to a crystal structure having the properties of a nonmagnetic semiconductor even at 460 [K] or lower but maintains a paramagnetic metal state over the entire temperature range of 0 to 800 [K] and which undergoes phase transition to a crystal structure of a nonmagnetic semiconductor upon application of pressure or light, the metal-substituted titanium oxide having a composition in which some of Ti sites of Ti₃O₅ are substituted with any one of Mg, Mn, Al, V and Nb.