Compressional and Shear Wave velocities of Fe2SiO4 Spinel at High Pressure and High Temperature

Journal Article · Tue Jan 01 00:00:00 EST 2008 · High Pressure Research

DOI:https://doi.org/10.1080/08957950802296287· OSTI ID:980075

Liu, Q; Liu, W; Whitaker, M; Wang, L; Li, B

Ultrasonic interferometric measurements on polycrystalline Fe{sub 2}SiO{sub 4} spinel were conducted simultaneously with synchrotron X-ray diffraction and X-ray imaging up to 6.5 GPa, 1073 K. The compressional and shear wave velocity data and the volume data were fitted to the third-order finite strain equations to derive the bulk and shear modulus and their pressure and temperature derivatives. The fitting results are as follows: K{sub s0}=204.5(7) GPa,=73.6(3) GPa, K's=4.3(3), G'=1.2(1), ({delta} K{sub s/{delta}} T){sub p}=-0.027(2) GPa/K, and {delta} (G/{delta} T){sub p}=-0.017(1) GPa/K. Comparison of our current results with previous data on (Mg,Fe){sub 2}SiO{sub 4} spinel with different compositions suggests that the bulk modulus (Ks) increases slightly with increasing iron content, while the shear modulus (G), in contrast, shows a dramatic decrease. However, the pressure and temperature derivatives of Ks and G remain nearly constant from Mg{sub 2}SiO{sub 4} to Fe{sub 2}SiO{sub 4} spinel with average values of 4.2-4.4, 1.2-1.3,-0.024 GPa/K, and-0.016 GPa/K for K's, G', ({delta} K{sub s/{delta}} T){sub p}, and ({delta} G/{delta} T){sub p}, respectively. The proposed version of equations to describe the effects of iron on the elastic moduli of ringwoodite are: Ks=184.7+18.0 X{sub Fe}, and G=118.7-41.5 X{sub Fe}.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 980075
• Report Number(s): BNL-92993-2010-JA; HPRSEL; TRN: US1005407
• Journal Information: High Pressure Research, Vol. 28, Issue 3; ISSN 0895-7959
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EQUATIONS
IRON
IRON SILICATES
OLIVINE
PRESSURE RANGE MEGA PA 10-100
SHEAR
SPINELS
STRAINS
TEMPERATURE RANGE 0400-1000 K
ULTRASONIC WAVES
VELOCITY
VOLUME
X-RAY DIFFRACTION
national synchrotron light source