Abstract
High-pressure and high-temperature experiments using a laser-heated diamond anvil cell (LHDAC) and synchrotron X-ray diffraction have revealed a phase transition in MgAl2O4. CaTi2O4-type MgAl2O4 was found to be stable at pressures between 45 and at least 117 GPa. The transition pressure of CaTi2O4-type phase in MgAl2O4 is much lower than that in the natural N-type mid-oceanic ridge basalt composition. The Birch–Murnaghan equation of state for CaTi2O4-type MgAl2O4 was determined from the experimental unit cell parameters with K 0=219(±6) GPa, K 0′=4(constrained value), and V 0=238.9(±9) Å3. The observed compressibility was in agreement with the theoretical compressibility calculated in a previous study. ε-MgAl2O4 was observed at pressures between 40 and 45 GPa, which has not been reported in natural rock compositions. The gradient (dP/dT slope) of the transition from the ε-type to CaTi2O4-type MgAl2O4 had a positive value. These results should resolve the dispute regarding the stable high-pressure phase of MgAl2O4, which has been reported in earlier studies using both the multi-anvil press and the diamond anvil cell.
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Acknowledgements
Comments from N. Guignot and anonymous reviewer greatly contributed to improve the present paper referee for comments. The synchrotron radiation experiments were performed at the PF, KEK (Proposal Nos. 2001G222 and 2003G187) and at the SPring-8, JASRI (Proposal Nos. 2004A3013 and 2004B4892). This work was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sport, Science and Technology, Japan.
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Ono, S., Kikegawa, T. & Ohishi, Y. The stability and compressibility of MgAl2O4 high-pressure polymorphs. Phys Chem Minerals 33, 200–206 (2006). https://doi.org/10.1007/s00269-006-0068-z
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DOI: https://doi.org/10.1007/s00269-006-0068-z