High-pressure generation in the Kawai-type multianvil apparatus equipped with tungsten-carbide anvils and sintered-diamond anvils, and X-ray observation on CaSnO3 and (Mg,Fe)SiO3
High-pressure generation in the Kawai-type multianvil apparatus equipped with tungsten-carbide anvils and sintered-diamond anvils, and X-ray observation on CaSnO3 and (Mg,Fe)SiO3
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DOI：
10.1016/j.crte.2018.07.004
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发表时间：
2019-02
影响因子：
1.4
通讯作者：
D. Yamazaki;E. Ito;T. Yoshino;N. Tsujino;A. Yoneda;H. Gomi;Jaseem Vazhakuttiyakam;M. Sakurai;Youyue Zhang;Y. Higo;Y. Tange
中科院分区：
文献类型：
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作者：
D. Yamazaki;E. Ito;T. Yoshino;N. Tsujino;A. Yoneda;H. Gomi;Jaseem Vazhakuttiyakam;M. Sakurai;Youyue Zhang;Y. Higo;Y. Tange
我们通过分别配备碳化钨（WC）和烧结金刚石（SD）立方体砧，将Kawai型多砧装置在室温下可达到的压力扩展到71.3 GPa和120.3 GPa。在使用WC砧的实验中，从室温加热到1500 K时，压力大幅下降，Δ P <$-20 GPa。在SD砧实验中，压力也从1673 K时的120 GPa下降到105 GPa。因此，为了产生更高的压力和温度，SD材料在质量和尺寸上的创新以及电池组件的改进是必不可少的。除了加压实验外，我们还对CaSnO 3和（Mg，Fe）SiO 3进行了原位能量色散X射线衍射观察。我们观察到新的峰的生长，这可以被分配到后钙钛矿相，从CaSnO 3钙钛矿的起始材料在48.4 GPa和1500 K转化，虽然它们没有被清楚地识别。相比之下，我们不能观察到后钙钛矿相（Mg，Fe）SiO 3在目前的P-T条件下产生的实验与SD砧。
We extended the attainable pressure of the Kawai-type multianvil apparatus to 71.3 GPa and 120.3 GPa at room temperature by equipping it with tungsten carbide (WC) and sintered diamond (SD) cubic anvils, respectively. In the experiments with WC anvils, pressure decreased largely, Δ P∼− 20 GPa, on heating from room temperature to 1500 K. In the experiments with SD anvils, pressure also dropped to 105 GPa from 120 GPa at 1673 K. In order to generate higher pressure and temperatures, therefore, innovation of SD material in both quality and size are essential, together with improvements of cell assembly. Besides pressure generation, we conducted in situ energy-dispersive X-ray diffraction observations on CaSnO 3 and (Mg, Fe) SiO 3 in the experiments with WC and SD anvils, respectively. We observed the growth of new peaks, which can be assigned to the post-perovskite phase, transformed from a starting material of CaSnO 3 perovskite at 48.4 GPa and 1500 K, although they are not clearly identified. In contrast, we could not observe the post-perovskite phase of (Mg, Fe) SiO 3 in the present P–T conditions generated by experiments with SD anvils.