The wi stite enigma
نویسندگان
چکیده
High-pressure energy dispersive X-ray diffraction of wi~stite has been obtained with three types of diamond cells; each one is designed to optimize a type of in situ study, namely single-crystal X-ray diffraction, deviatoric strain measurement, or simultaneous high-P-T experimentation. The results demonstrate that above 17 GPa at 300 K wiastite undergoes a displacive transition from B 1 to a rhombohedral structure, and above 90 GPa at 600 K, a second transition to the NiAs structure. Many of the earlier inconsistencies concerning the structure and properties of wiistite at high pressures can be attributed to the extreme softening of the C44 elastic modulus at pressures above 10 GPa.
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تاریخ انتشار 2002