Phase transition and melting in zircon by nanosecond shock loading

Phase transition and melting in zircon by nanosecond shock loading
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纳秒冲击载荷引起的锆石相变和熔化

DOI:
10.1007/s00269-022-01184-8
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发表时间:
2022
影响因子:
1.4
通讯作者:
Toshinori Yabuuchi
Toshinori Yabuuchi
中科院分区:
地球科学4区
文献类型:
--
作者:
Sota Takagi;Kouhei Ichiyanagi;Atsushi Kyono;Nobuaki Kawai;Shunsuke Nozawa;Norimasa Ozaki;Yusuke Seto;Takuo Okuchi;Souma Nitta;Satoru Okada;Kohei Miyanishi;Keiichi Sueda;Tadashi Togashi;Toshinori Yabuuchi

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在这项研究中,我们使用激光驱动的冲击压缩耦合原位X射线衍射询问冲击压缩锆石(ZrSiO 4)的相变动力学的第一次。在纳秒时间尺度的激光驱动的冲击从锆石的高压reidite相的相变进行了观察。在高激光功率下,锆石和瑞地石的衍射峰出现叠加在两个宽的特征上。这种漫反射的背景归因于部分熔体的液体散射。在最高激光功率下,漫散射占主导地位,晶体衍射的证据最少。在释放时,熔体重结晶成锆石和钠长石的组合。未观察到锆石分解为SiO2和ZrO 2。这项研究表明,在激光冲击的时间尺度上,锆-reidite相变容易发生。而锆英石分解为ZrO 2和SiO2的反应动力学受到抑制。
In this study, we use laser-driven shock compression coupled with in situ X-ray diffraction to interrogate the phase transition dynamics of shock-compressed zircon (ZrSiO4) for the first time. A phase transition from zircon to the high-pressure reidite phase was observed during the nanosecond timescale of a laser-driven shock. At high laser power, diffraction peaks of zircon and reidite appeared superimposed on two broad features. This diffuse background was ascribed to liquid scattering from a partial melt. At the highest laser power, the diffuse scattering dominated, with minimal evidence for crystal diffraction. On release, the melt recrystallized into a combination of zircon and reidite. Decomposition of zircon to SiO2and ZrO2was not observed. This study revealed that on laser-shock timescales, the zircon–reidite phase transition readily occurs. However, the decomposition of zircon into ZrO2and SiO2is kinetically inhibited.
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