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In situ observation of a phase transition in Fe2SiO4 at high pressure and high temperature |
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| Authors: | Shigeaki Ono Takumi Kikegawa Yuji Higo |
| Institution: | 1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa, 237-0061, Japan 2. High Energy Acceleration Research Organization, 1-1 Oho, Tsukuba-shi, Ibaragi, 305-0801, Japan 3. Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan |
| Abstract: | We used an in situ measurement method to investigate the phase transition of Fe2SiO4 polymorphs under high pressures and temperatures. A multi-anvil high-pressure apparatus combined with synchrotron X-ray radiation was used. The stability of each polymorph was identified by observing the X-ray diffraction data from the sample. In most experiments, the diffraction patterns were collected 10–30 min after reaching the desired pressure and temperature conditions. The transition boundary between the olivine and spinel phase at T = 1,000–1,500 K and P = 2–8 GPa was determined to occur at P (GPa) = 0.5 + 0.0034 × T (K). The transition pressure determined in this study was in general agreement with that observed in previous high-pressure experiments. However, the slope of the transition, dP/dT, determined in our study was significantly higher than that estimated by the previous study combined with the in situ X-ray method. |
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