In situ observation of the phase transition behavior of shocked baddeleyite.
In situ observation of the phase transition behavior of shocked baddeleyite.
复制标题
冲击斜锆石相变行为的原位观察。
DOI：
10.1029/2020gl089592
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发表时间：
2020
影响因子：
5.2
通讯作者：
Kouhei Ichiyanagi
中科院分区：
文献类型：
--
作者：
Sota Takagi;Atsushi Kyono;Shunsuke Nozawa;Nobuaki Kawai;Koji Inukai;Ryo Fukaya;Nobumasa Funamori;Shin‐ichi Adachi;Kouhei Ichiyanagi
斜方石(ZrO2)被用来推断冲击压力和了解行星体的撞击历史。尽管在静水条件下斜晶石的高压相变行为已被广泛研究，但关于冲击加载条件下相变动态响应的信息却很少。我们在日本高能加速器研究组织(KEK)的光子工厂先进环(Photon Factory Advanced Ring，KEK)的光束线NW14A上用同步加速器X射线脉冲对加载冲击波的斜斜晶石进行了原位X射线衍射测量。冲击压缩过程中，在3.3 GPa时发生了从单斜晶系到正交晶系的相变，并在随后的释放过程中立即返回到单斜晶系。在15 Gpa以下，没有观察到正交晶型的-II-ZrO2。这项研究改进了斜斜晶石在高达15 GPA的冲击条件下的相变行为，并通过直接观测确定了相变边界。这些发现提高了对行星体激波历史的理解。
Baddeleyite (ZrO2) is used to infer shock pressures and understand the impact history of planetary bodies. Although the high‐pressure phase transition behavior of baddeleyite has been intensively investigated under hydrostatic conditions, there is little information on the dynamic response of phase transitions under shock‐loading conditions. We performed in situ X‐ray diffraction measurements on shock‐loaded baddeleyite using a synchrotron X‐ray pulse at beamline NW14A of the Photon Factory Advanced Ring, High Energy Accelerator Research Organization (KEK), Japan. A phase transition from monoclinic to orthorhombic‐I ZrO2occurs at 3.3 GPa during shock compression and immediately returns to the monoclinic phase during subsequent release. Orthorhombic‐II ZrO2is not observed up to 15 GPa. This study refines the phase transition behavior of baddeleyite under shock conditions up to 15 GPa, and the phase transition boundary is determined from direct observations. These findings improve the understanding of the shock history of planetary bodies.