Phase behavior of ABO3-type compound under ultra high pressure

本研究通过对第四族（钛族）B阳离子ABO_3的高压与温度相关系的研究，获得了颠覆以往高压科学常识的新发现。在高压下，部分钛酸盐转变为AO+ATi_3O_7和AO+ATi_2O_5。特别是AO+ATi_3O_7的相组合比常被认为是高压下ATiO_3终态的AO+TiO_2共隧道矿的相组合更致密。这一研究结果对预测巨行星内部深部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.