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We have determined the post-spinel transition boundary in anhydrous and hydrous Mg 2 SiO 4 in a temperature range from 1173 to 2023K at 19.3–25.4GPa using synchrotron in situ X-ray diffraction measurements. The phase boundary in Mg 2 SiO 4 is located at 22GPa and 1800K and 22.1GPa and 1500K, which is slightly lower (~0.3–0.5GPa) than that determined in the previous...
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