Abstract
In situ X-ray observations of the phase transition from ilmenite to perovskite structure in MnGeO3 were carried out in a Kawai-type high-pressure apparatus interfaced with synchrotron radiation. The phase boundary between the ilmenite and perovskite structures in the temperature range of 700–1,400°C was determined to be P (GPa) = 16.5(±0.6) − 0.0034(±0.0006)T (°C) based on Anderson’s gold pressure scale. The Clapeyron slope, dP/dT, determined in this study is consistent with that for the transition boundary between the ilmenite and the perovskite structure in MgSiO3.
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Acknowledgments
We thank Y. Ueda for assistance in the experiments, A. Yoneda for helpful suggestions, M. Kanzaki for providing heater material, B. Paul for reading manuscript, and the COE-21 program for partial support. X-ray diffraction measurements were conducted at BL04B1, SPring-8, Japan (proposal nos., 2005B0449, 2006A1477). M. Matsui and anonymous reviewers are also thanked to improve the manuscript.
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Yamazaki, D., Ito, E., Tange, Y. et al. Phase boundary between ilmenite and perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements. Phys Chem Minerals 34, 269–273 (2007). https://doi.org/10.1007/s00269-007-0145-y
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DOI: https://doi.org/10.1007/s00269-007-0145-y