The compressibility of a natural composition calcium ferrite-type aluminous phase to 70 GPa

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• 作者：Ono ; Shigeaki ; Hirose ; Kei ; Kikegawa ; Takumi ; Saito ; Yoko
• 关键词：Calcium ferrite-type aluminous phase ; Equation of state ; X-ray powder diffraction ; High P&ndash ; T ; Subducting slab
• 刊名：Physics of the Earth and Planetary Interiors
• 出版年：2002
• 出版时间：August 30, 2002
• 年：2002
• 卷：131
• 期：3-4
• 页码：311-318
• 全文大小：126 K

文摘

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