Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..112..257l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 112, Issue 3-4, p. 257-266.
Physics
21
Scientific paper
The pressure-volume-temperature (P-V-T) behavior in SiO2-stishovite has been studied using a DIA-type, cubic-anvil apparatus (SAM85) interfaced with in situ synchrotron X-ray diffraction at the superconducting wiggler beamline (X-17B) of the National Synchrotron Light Source, using a polycrystalline specimen previously hot-pressed in a 2000-ton uniaxial split-sphere apparatus (USSA-2000). The P-V-T data up to 10 GPa and 1273 K were analyzed using several approaches based on the Birch-Murnaghan equation-of-state (EOS) and related thermodynamic relations. The results obtained from different approaches are internally consistent. With the pressure derivative KT0' fixed at the ultrasonically determined value of K0'=5.3, we obtained the isothermal bulk modulus KT0'=294(2) GPa and its temperature derivative (∂KT/∂T)P=-0.041(11) GPa K-1, and the thermal expansion coefficients a0=1.40(8)×10-5 K-1 and a1=10.9(20)×10-9 K-2. The room temperature bulk modulus (KT0) of the present study is in agreement with the adiabatic values obtained previously from Brillouin scattering and diamond-anvil cell X-ray diffraction studies on single crystal stishovite and ultrasonic studies on polycrystalline specimens.
Flesch Lucy
Li Baowen
Liebermann Robert C.
Liu Jinjie
Weidner Donald J.
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