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American Mineralogist; April 2008; v. 93; no. 4; p. 653-657; DOI: 10.2138/am.2008.2645
© 2008 Mineralogical Society of America
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High-pressure phase relation of MnSiO3 up to 85 GPa: Existence of MnSiO3 perovskite

Kiyoshi Fujino1,*, Keisuke Suzuki1, Daisuke Hamane1, Yusuke Seto1, Takaya Nagai1 and Nagayoshi Sata2

1 Department of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
2 Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan


Figure 1
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  		FIGURE 1. X-ray diffraction patterns of MnSiO3 perovskite (a) at 34 GPa, 300 K (M-9-1, {lambda} = 0.4263 Å) quenched from 1800 K, (b) at ambient conditions (M-9-2, {lambda} = 0.4263 Å) decompressed from a, and (c) at 85 GPa, 2600 K (M-14-2, {lambda} = 0.4168 Å). Peaks with indices = MnSiO3 perovskite; B1 = NaCl (B1); B2 = NaCl (B2); St = stishovite.

 

Figure 2
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  		FIGURE 2. Temperature and pressure paths and the product phases identified by high-pressure and high-temperature in situ X-ray diffraction or X-ray diffraction of the recovered sample. The product phases at 42 GPa, 2800 K were estimated from the X-ray diffraction pattern of the recovered sample.

 

Figure 3
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  		FIGURE 3. Plot of the product phases and the estimated phase boundaries in MnSiO3 at high pressure and high temperature. The run numbers next to the data points are the same as those in Figure 2Go. The previous data of Liu (1976) and Ito and Matsui (1977) are also plotted.

 

Figure 4
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  		FIGURE 4. Variations of refined cell ratios at room temperature and high pressure.

 




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