Simultaneous equation of state, pressure calibration and sound velocity measurements to lower mantle pressures using multi-anvil apparatus

摘要: Multiple techniques for measuring acoustic travel times using ultrasonic interferometry, sample unit-cell volume X-ray diffraction, and specimen length X-radiography were adapted simultaneously to a double-stage, large-volume high-pressure apparatus, allowing measurements of velocities under high pressure temperature. Combined analysis the density data enables us determine elastic properties their derivatives independent up lower mantle conditions. Furthermore, can be directly calculated measured velocity finite-strain equations state compared with those obtained from standard adjacent sample, providing means calibrate scales currently in use. Complete experimental procedures are demonstrated on polycrystalline wadsleyite 20 GPa. Finite-strain fitting gives K0S = 174(2) GPa, K′0 4.2(1), G0 111(1) GPa  G′0 = 1.5(1)G′0 = 1.5(1) 1.5(1) bulk shear moduli, while these differs NaCl scale by as much ~ 12.0(1.2)% at Using techniques, it is possible measure sound minerals pressures study composition Earth's interior.