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The runs with heating duration of a few seconds were terminated when the temperature reached the prescribed value by shutting off the heating power supply.
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We thank K. Onuma for the use of the high-pressure apparatus, H. Horiuchi for the use of the micro-area x-ray diffractometer, I. Shimuzu for discussion, S. Karato for useful comments of an early version of the manuscript and two anonymous referees for valuable comments.
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