Compressibility of nanocrystalline forsterite |
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| Authors: | Hélène Couvy Jiuhua Chen Vadym Drozd |
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| Institution: | (1) Department of Mechanical and Materials Engineering, The Center for the Study of Matter at Extreme Conditions, Florida International University, Miami, FL 33199, USA |
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| Abstract: | We established an equation of state for nanocrystalline forsterite using multi-anvil press and diamond anvil cell. Comparative
high-pressure and high-temperature experiments have been performed up to 9.6 GPa and 1,300°C. We found that nanocrystalline
forsterite is more compressible than macro-powder forsterite. The bulk modulus of nanocrystalline forsterite is equal to 123.3
(±3.4) GPa whereas the bulk modulus of macro-powder forsterite is equal to 129.6 (±3.2) GPa. This difference is attributed
to a weakening of the elastic properties of grain boundary and triple junction and their significant contribution in nanocrystalline
sample compare to the bulk counterpart. The bulk modulus at zero pressure of forsterite grain boundary was determined to be
83.5 GPa. |
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