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• W1997908641 abstract "We present a temperature-pressure-volume ( T-P-V ) equation-of-state (EOS) of (Mg 0.8 ,Fe 0.2 ) 2 SiO 4 ringwoodite based on in situ high- T and high- P synchrotron X-ray diffraction experiments up to 1700 K and 20 GPa with a multi-anvil apparatus at SPring-8. The third-order Birch-Murnaghan equation was applied to the data between 300 and 900 K, while a constant ( ∂P/∂T) V fitting at temperatures higher than 900 K. By fixing previously measured volume thermal expansivities at 0 GPa and the isothermal bulk modulus at 300 K and 0 GPa of K 0,300k = 189.7 GPa, we derived the T-P-V EOS parameters of (Mg 0.8 ,Fe 0.2 ) 2 SiO 4 ringwoodite using least squares to be ( ∂K 0 /∂ P ) T = 4.57(7) and ( ∂K T /∂T) P = −0.0283(13) GPa/K between 300 and 900 K, and ( ∂P/∂T) V = 0.00535(11) GPa/K at temperatures above 900 K. These values compare very well with previously measured EOS data for Mg 2 SiO 4 ringwoodite of ( ∂K 0 /∂P) T = 4.6(2), ( ∂K T /∂T) P = −0.029(1) GPa/K, and ( ∂P/∂T) V = 0.0052 − 0.0055 GPa/K at high temperatures. At P = 20 GPa and T = 1800 K, as representative conditions in the lower part of the mantle transition zone, the relative V and K T values of (Mg 0.8 ,Fe 0.2 ) 2 SiO 4 ringwoodite with respect to the values at 300 K and 0 GPa are found to be V/V 0 = 0.9424, K T / K 0,300K = 1.263, based on the present EOS. These results for (Mg 0.8 ,Fe 0.2 ) 2 SiO 4 ringwoodite, combined with the corresponding data for Mg 2 SiO 4 ringwoodite, describe that the effects of Fe substitution for Mg on the T-P-V EOS of ringwoodite with (Mg 0.9 ,Fe 0.1 ) 2 SiO 4 , thought to be the composition in the mantle transition zone, are virtually negligible for V/V 0 , and less than 1% for K T /K 0,300k ." @default.
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• W1997908641 date "2006-11-09" @default.
• W1997908641 modified "2023-09-24" @default.
• W1997908641 title "Equation of state of (Mg0.8,Fe0.2)2SiO4ringwoodite from synchrotron X-ray diffraction up to 20 GPa and 1700 K" @default.
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• W1997908641 doi "https://doi.org/10.1127/0935-1221/2006/0018-0523" @default.
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