Abstract
We have re‐examined the crystal structure and equation of state of MgSiO3 perovskite by single‐crystal X‐ray diffraction up to 10 GPa. We have determined an isothermal bulk modulus K0 = 253(1) GPa with K′0 = 4, which is in excellent agreement with the adiabatic bulk moduli reported in recent studies by Brillouin spectroscopy and ultrasonic interferometry. We confirm that the compressibility of perovskite is anisotropic with the b‐axis being the least compressible direction. On compression, the bond lengths and angles on Mg‐site and Si‐site decrease continuously, indicating that the structure gets more distorted as pressure increases. This is supported by a general model for perovskites that predicts that the octahedra become more tilted at lower mantle pressures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
