Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..131..311o&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 131, Issue 3-4, p. 311-318.
Physics
10
Scientific paper
In situ X-ray diffraction (XRD) experiments of a calcium ferrite-type aluminous phase that is a sodium host mineral of subducted oceanic crusts into the Earth's lower mantle have been carried out using a laser-heated diamond anvil cell (LHDAC), up to a pressure of 70GPa with synchrotron radiation source at the Photon Factory (PF) in Japan. The sample was heated using a Nd:YAG laser at each pressure increment to relax the deviatoric stress in the sample. XRD measurements were carried out at 300K using an angle-dispersive technique. The pressure was determined from an internal platinum pressure calibrant. A Birch-Murnaghan equation of state (EOS) was determined from the experimental unit cell parameters: volume V0=244.07 (+/-55)Å3, density ρ0=4.143g/cm3, bulk modulus K0=253 (+/-14)GPa, and K0'=3.6 (+/-0.6). When the first pressure derivative of the bulk modulus K0' was fixed at 4, the value of K0=243 (+/-2)GPa was obtained. The density of the calcium ferrite-type aluminous phase is lower than those of co-existing Mg-, Ca-perovskite, and hexagonal aluminous phase in subducted oceanic crusts.
Hirose Kei
Kikegawa Takumi
Ono Shigeaki
Saito Yoko
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