Combined in situ Synchrotron X-ray Diffraction and Ultrasonic Interferometry Study of e-FeSi at High Pressure and Temperature

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

DOI:https://doi.org/10.1080/08957950802246480· OSTI ID:980072

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

Ultrasonic interferometry was used in combination with synchrotron X-radiation to determine the compressional and shear wave velocities and unit-cell volumes of {Epsilon}-FeSi (cubic B20 structure) at room temperature and pressures up to {approx}12 GPa. The data collected during compression are compared with those collected during decompression after heating to release stress within the sample cell. By fitting all of the decompression unit-cell volume and sound velocity data to third-order finite-strain equations, we obtain the adiabatic zero-pressure bulk and shear moduli and their first pressure derivatives: K{sub S0}=169.3 (8) GPa, G{sub 0}=116.3 (4) GPa, K'S0=6.5(3), G'0=3.0(1). The bulk modulus obtained from this study is in good agreement with those of some previous experimental studies, but significantly lower than those obtained by first-principle calculations. This study presents the first direct measurement on the shear properties of this phase.

• 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: 980072
• Report Number(s): BNL-92990-2010-JA; HPRSEL; TRN: US1005406
• Journal Information: High Pressure Research, Vol. 283, 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
COMPRESSION
DATA
EQUATIONS
HEATING
INTERFEROMETRY
PRESSURE RANGE MEGA PA 10-100
SHEAR
SHEAR PROPERTIES
SOUND WAVES
SYNCHROTRONS
ULTRASONIC WAVES
VELOCITY
VOLUME
X RADIATION
X-RAY DIFFRACTION
national synchrotron light source