Phase behavior of ABO3-type compound under ultra high pressure

在这项研究中，我们研究了B离子组成的第4族(钛族)ABO_3的高压与温度的相关系，从而获得了一个颠覆了过去高压科学的常识的新发现。几种钛矿在高压下转变为AO+ATI_3O_7和AO+ATI_2O_5。尤其是，在高压下，常被认为是ATiO_3的终态的AO+ATI_3O_7的相组合比常被预测为ATiO_3的终态的AO+TiO_2共隧道石更致密。这一研究结果将对预测巨行星内部深部的硅酸盐矿物组合具有重要意义。

In this study, We investigated the high pressure and temperature phase relation on ABO_3, which B cation consist of 4th group (titanium family), and then was able to obtain a new finding that overturned the common sense of a past high pressure science. Several titanite transformed to the form of AO+ATi_3O_7 and AO+ATi_2O_5 under high pressure. Especially, the phase assemblage of AO+ATi_3O_7 is denser than AO+TiO_2 cotunnite that often predicted as terminal state for ATiO_3 at high pressure. The result of this study will be important for predicting the silicate mineral assemblage in the deep interior of giant planets.