应用在位电阻率测量方法研究高压下锐钛矿Ti O2的电学性质.通过研究电阻率随压力变化的异常变化点,观察到了Ti O2从锐钛矿-柯铁矿-斜锆石的相变.卸压后,电阻率数值和初始值相差2个数量级,说明该相变为不可逆相变.结合第一性原理计算结果表明,柯铁矿结构更小的带隙是导致Ti O2电阻率减小的根本原因. The in-situ resistivity measurement method was used to study the electrical properties of anatase Ti O2 under high pressure. The phase transition of Ti O2 from anatase-kertite-orthoclase zircon was observed by studying the variation of resistivity with pressure. After pressure relief, the difference between the resistivity and the initial value is two orders of magnitude, which indicates that the phase transition is irreversible phase change.The first-principles calculation results show that the smaller band gap of the kedite structure leads to the decrease of the resistivity of Ti O2 Small root cause.